Ghada World — Science Quizzes EncyclopediaGhada World — Science Quizzes Encyclopedia
Ghada World — A trusted Q&A encyclopedia · 23,105 questions · Part 23 of 47
Q11001: What is the missing number: 164 + ? = 313
Answer: 149
💡 Missing number = 313 - 164 = 149; check: 164 + 149 = 313.
Q11002: What is the missing number: 100 + ? = 130
Answer: 30
💡 Missing number = 130 - 100 = 30; check: 100 + 30 = 130.
Q11003: What is the value of x if: x - 40 = 71
Answer: 111
💡 x = 71 + 40 = 111; check: 111 - 40 = 71.
Q11004: What is the missing number: ? + 173 = 325
Answer: 152
💡 Missing number = 325 - 173 = 152; check: 173 + 152 = 325.
Q11005: What is the missing number: ? + 80 = 170
Answer: 90
💡 Missing number = 170 - 80 = 90; check: 80 + 90 = 170.
Q11006: What is the value of x if: x - 6 = 217
Answer: 223
💡 x = 217 + 6 = 223; check: 223 - 6 = 217.
Q11007: What is the missing number: 17 + ? = 88
Answer: 71
💡 Missing number = 88 - 17 = 71; check: 17 + 71 = 88.
Q11008: What is the missing number: ? + 145 = 321
Answer: 176
💡 Missing number = 321 - 145 = 176; check: 145 + 176 = 321.
Q11009: What is the missing number: ? + 55 = 217
Answer: 162
💡 Missing number = 217 - 55 = 162; check: 55 + 162 = 217.
Q11010: What is the value of x if: x - 52 = 63
Answer: 115
💡 x = 63 + 52 = 115; check: 115 - 52 = 63.
Q11011: What is the missing number: 173 + ? = 352
Answer: 179
💡 Missing number = 352 - 173 = 179; check: 173 + 179 = 352.
Q11012: What is the value of x if: x - 116 = 108
Answer: 224
💡 x = 108 + 116 = 224; check: 224 - 116 = 108.
Q11013: What is the value of x if: x - 113 = 101
Answer: 214
💡 x = 101 + 113 = 214; check: 214 - 113 = 101.
Q11014: What is the value of x if: x - 131 = 162
Answer: 293
💡 x = 162 + 131 = 293; check: 293 - 131 = 162.
Q11015: What is the missing number: ? + 150 = 243
Answer: 93
💡 Missing number = 243 - 150 = 93; check: 150 + 93 = 243.
Q11016: What is the missing number: 10 + ? = 65
Answer: 55
💡 Missing number = 65 - 10 = 55; check: 10 + 55 = 65.
Q11017: What is the value of x if: x - 193 = 63
Answer: 256
💡 x = 63 + 193 = 256; check: 256 - 193 = 63.
Q11018: What is the missing number: 32 + ? = 93
Answer: 61
💡 Missing number = 93 - 32 = 61; check: 32 + 61 = 93.
Q11019: What is the missing number: 144 + ? = 265
Answer: 121
💡 Missing number = 265 - 144 = 121; check: 144 + 121 = 265.
Q11020: What is the value of x if: x - 20 = 15
Answer: 35
💡 x = 15 + 20 = 35; check: 35 - 20 = 15.
Q11021: What is the missing number: 78 + ? = 89
Answer: 11
💡 Missing number = 89 - 78 = 11; check: 78 + 11 = 89.
Q11022: What is the missing number: ? + 133 = 191
Answer: 58
💡 Missing number = 191 - 133 = 58; check: 133 + 58 = 191.
Q11023: What is the missing number: ? + 38 = 186
Answer: 148
💡 Missing number = 186 - 38 = 148; check: 38 + 148 = 186.
Q11024: What is the value of x if: x - 41 = 106
Answer: 147
💡 x = 106 + 41 = 147; check: 147 - 41 = 106.
Q11025: What is the missing number: ? × 9 = 99
Answer: 11
💡 Missing number = 99 ÷ 9 = 11; check: 11 × 9 = 99.
Q11026: What is the missing number: 70 + ? = 154
Answer: 84
💡 Missing number = 154 - 70 = 84; check: 70 + 84 = 154.
Q11027: What is the missing number: ? + 73 = 203
Answer: 130
💡 Missing number = 203 - 73 = 130; check: 73 + 130 = 203.
Q11028: What is the missing number: 32 + ? = 50
Answer: 18
💡 Missing number = 50 - 32 = 18; check: 32 + 18 = 50.
Q11029: What is the value of x if: x - 17 = 200
Answer: 217
💡 x = 200 + 17 = 217; check: 217 - 17 = 200.
Q11030: What is the missing number: 75 + ? = 224
Answer: 149
💡 Missing number = 224 - 75 = 149; check: 75 + 149 = 224.
Q11031: What is the missing number: ? × 11 = 99
Answer: 9
💡 Missing number = 99 ÷ 11 = 9; check: 9 × 11 = 99.
Q11032: What is the missing number: ? × 8 = 64
Answer: 8
💡 Missing number = 64 ÷ 8 = 8; check: 8 × 8 = 64.
Q11033: What is the missing number: 139 + ? = 251
Answer: 112
💡 Missing number = 251 - 139 = 112; check: 139 + 112 = 251.
Q11034: What is the value of x if: x - 61 = 2
Answer: 63
💡 x = 2 + 61 = 63; check: 63 - 61 = 2.
Q11035: What is the missing number: ? × 4 = 16
Answer: 4
💡 Missing number = 16 ÷ 4 = 4; check: 4 × 4 = 16.
Q11036: What is the missing number: ? + 14 = 138
Answer: 124
💡 Missing number = 138 - 14 = 124; check: 14 + 124 = 138.
Q11037: What is the value of x if: x - 141 = 71
Answer: 212
💡 x = 71 + 141 = 212; check: 212 - 141 = 71.
Q11038: What is the value of x if: x - 95 = 57
Answer: 152
💡 x = 57 + 95 = 152; check: 152 - 95 = 57.
Q11039: What is the value of x if: x - 32 = 145
Answer: 177
💡 x = 145 + 32 = 177; check: 177 - 32 = 145.
Q11040: What is the missing number: 11 + ? = 171
Answer: 160
💡 Missing number = 171 - 11 = 160; check: 11 + 160 = 171.
Q11041: What is the value of x if: x - 16 = 68
Answer: 84
💡 x = 68 + 16 = 84; check: 84 - 16 = 68.
Q11042: What is the value of x if: x - 217 = 22
Answer: 239
💡 x = 22 + 217 = 239; check: 239 - 217 = 22.
Q11043: What is the missing number: ? + 110 = 133
Answer: 23
💡 Missing number = 133 - 110 = 23; check: 110 + 23 = 133.
Q11044: What is the missing number: 149 + ? = 293
Answer: 144
💡 Missing number = 293 - 149 = 144; check: 149 + 144 = 293.
Q11045: What is the missing number: ? + 13 = 177
Answer: 164
💡 Missing number = 177 - 13 = 164; check: 13 + 164 = 177.
Q11046: What is the missing number: 101 + ? = 244
Answer: 143
💡 Missing number = 244 - 101 = 143; check: 101 + 143 = 244.
Q11047: What is the missing number: 49 + ? = 151
Answer: 102
💡 Missing number = 151 - 49 = 102; check: 49 + 102 = 151.
Q11048: What is the missing number: ? × 7 = 56
Answer: 8
💡 Missing number = 56 ÷ 7 = 8; check: 8 × 7 = 56.
Q11049: What is the missing number: ? + 160 = 260
Answer: 100
💡 Missing number = 260 - 160 = 100; check: 160 + 100 = 260.
Q11050: What is the missing number: ? + 42 = 150
Answer: 108
💡 Missing number = 150 - 42 = 108; check: 42 + 108 = 150.
Q11051: What is the missing number: 38 + ? = 121
Answer: 83
💡 Missing number = 121 - 38 = 83; check: 38 + 83 = 121.
Q11052: What is the value of x if: x - 5 = 135
Answer: 140
💡 x = 135 + 5 = 140; check: 140 - 5 = 135.
Q11053: What is the missing number: ? + 148 = 155
Answer: 7
💡 Missing number = 155 - 148 = 7; check: 148 + 7 = 155.
Q11054: What is the value of x if: x - 31 = 184
Answer: 215
💡 x = 184 + 31 = 215; check: 215 - 31 = 184.
Q11055: What is the value of x if: x - 10 = 67
Answer: 77
💡 x = 67 + 10 = 77; check: 77 - 10 = 67.
Q11056: What is the missing number: 66 + ? = 119
Answer: 53
💡 Missing number = 119 - 66 = 53; check: 66 + 53 = 119.
Q11057: What is the value of x if: x - 35 = 72
Answer: 107
💡 x = 72 + 35 = 107; check: 107 - 35 = 72.
Q11058: What is the missing number: 75 + ? = 79
Answer: 4
💡 Missing number = 79 - 75 = 4; check: 75 + 4 = 79.
Q11059: What is the missing number: 91 + ? = 267
Answer: 176
💡 Missing number = 267 - 91 = 176; check: 91 + 176 = 267.
Q11060: What is the missing number: 178 + ? = 236
Answer: 58
💡 Missing number = 236 - 178 = 58; check: 178 + 58 = 236.
Q11061: What is the missing number: ? + 92 = 210
Answer: 118
💡 Missing number = 210 - 92 = 118; check: 92 + 118 = 210.
Q11062: What is the missing number: 150 + ? = 189
Answer: 39
💡 Missing number = 189 - 150 = 39; check: 150 + 39 = 189.
Q11063: What is the missing number: 134 + ? = 268
Answer: 134
💡 Missing number = 268 - 134 = 134; check: 134 + 134 = 268.
Q11064: What is the value of x if: x - 170 = 128
Answer: 298
💡 x = 128 + 170 = 298; check: 298 - 170 = 128.
Q11065: What is the missing number: ? + 129 = 172
Answer: 43
💡 Missing number = 172 - 129 = 43; check: 129 + 43 = 172.
Q11066: What is the value of x if: x - 31 = 253
Answer: 284
💡 x = 253 + 31 = 284; check: 284 - 31 = 253.
Q11067: What is the missing number: ? + 74 = 244
Answer: 170
💡 Missing number = 244 - 74 = 170; check: 74 + 170 = 244.
Q11068: What is the missing number: 121 + ? = 158
Answer: 37
💡 Missing number = 158 - 121 = 37; check: 121 + 37 = 158.
Q11069: What is the missing number: ? + 22 = 105
Answer: 83
💡 Missing number = 105 - 22 = 83; check: 22 + 83 = 105.
Q11070: What is the missing number: ? + 164 = 312
Answer: 148
💡 Missing number = 312 - 164 = 148; check: 164 + 148 = 312.
Q11071: What is the value of x if: x - 150 = 64
Answer: 214
💡 x = 64 + 150 = 214; check: 214 - 150 = 64.
Q11072: What is the missing number: 28 + ? = 205
Answer: 177
💡 Missing number = 205 - 28 = 177; check: 28 + 177 = 205.
Q11073: What is the missing number: 169 + ? = 194
Answer: 25
💡 Missing number = 194 - 169 = 25; check: 169 + 25 = 194.
Q11074: What is the missing number: ? + 92 = 102
Answer: 10
💡 Missing number = 102 - 92 = 10; check: 92 + 10 = 102.
Q11075: What is the value of x if: x - 58 = 5
Answer: 63
💡 x = 5 + 58 = 63; check: 63 - 58 = 5.
Q11076: What is the missing number: ? + 11 = 82
Answer: 71
💡 Missing number = 82 - 11 = 71; check: 11 + 71 = 82.
Q11077: What is the missing number: ? + 58 = 130
Answer: 72
💡 Missing number = 130 - 58 = 72; check: 58 + 72 = 130.
Q11078: What is the value of x if: x - 122 = 81
Answer: 203
💡 x = 81 + 122 = 203; check: 203 - 122 = 81.
Q11079: What is the missing number: 70 + ? = 161
Answer: 91
💡 Missing number = 161 - 70 = 91; check: 70 + 91 = 161.
Q11080: What is the missing number: 121 + ? = 290
Answer: 169
💡 Missing number = 290 - 121 = 169; check: 121 + 169 = 290.
Q11081: What is the missing number: ? + 169 = 282
Answer: 113
💡 Missing number = 282 - 169 = 113; check: 169 + 113 = 282.
Q11082: What is the missing number: 156 + ? = 335
Answer: 179
💡 Missing number = 335 - 156 = 179; check: 156 + 179 = 335.
Q11083: What is the value of x if: x - 56 = 155
Answer: 211
💡 x = 155 + 56 = 211; check: 211 - 56 = 155.
Q11084: What is the missing number: 180 + ? = 306
Answer: 126
💡 Missing number = 306 - 180 = 126; check: 180 + 126 = 306.
Q11085: What is the missing number: 177 + ? = 320
Answer: 143
💡 Missing number = 320 - 177 = 143; check: 177 + 143 = 320.
Q11086: What is the missing number: ? + 115 = 263
Answer: 148
💡 Missing number = 263 - 115 = 148; check: 115 + 148 = 263.
Q11087: What is the value of x if: x - 18 = 6
Answer: 24
💡 x = 6 + 18 = 24; check: 24 - 18 = 6.
Q11088: What is the value of x if: x - 35 = 109
Answer: 144
💡 x = 109 + 35 = 144; check: 144 - 35 = 109.
Q11089: What is the missing number: ? + 89 = 185
Answer: 96
💡 Missing number = 185 - 89 = 96; check: 89 + 96 = 185.
Q11090: What is the missing number: 173 + ? = 287
Answer: 114
💡 Missing number = 287 - 173 = 114; check: 173 + 114 = 287.
Q11091: What is the value of x if: x - 173 = 82
Answer: 255
💡 x = 82 + 173 = 255; check: 255 - 173 = 82.
Q11092: What is the missing number: ? + 80 = 109
Answer: 29
💡 Missing number = 109 - 80 = 29; check: 80 + 29 = 109.
Q11093: What is the value of x if: x - 4 = 14
Answer: 18
💡 x = 14 + 4 = 18; check: 18 - 4 = 14.
Q11094: What is the missing number: ? + 150 = 255
Answer: 105
💡 Missing number = 255 - 150 = 105; check: 150 + 105 = 255.
Q11095: What is the missing number: 116 + ? = 246
Answer: 130
💡 Missing number = 246 - 116 = 130; check: 116 + 130 = 246.
Q11096: What is the missing number: 135 + ? = 177
Answer: 42
💡 Missing number = 177 - 135 = 42; check: 135 + 42 = 177.
Q11097: What is the missing number: 125 + ? = 229
Answer: 104
💡 Missing number = 229 - 125 = 104; check: 125 + 104 = 229.
Q11098: What is the missing number: 154 + ? = 156
Answer: 2
💡 Missing number = 156 - 154 = 2; check: 154 + 2 = 156.
Q11099: What is the missing number: 62 + ? = 180
Answer: 118
💡 Missing number = 180 - 62 = 118; check: 62 + 118 = 180.
Q11100: What is the missing number: 28 + ? = 47
Answer: 19
💡 Missing number = 47 - 28 = 19; check: 28 + 19 = 47.
Q11101: What is the value of x if: x - 31 = 32
Answer: 63
💡 x = 32 + 31 = 63; check: 63 - 31 = 32.
Q11102: What is the missing number: 15 + ? = 175
Answer: 160
💡 Missing number = 175 - 15 = 160; check: 15 + 160 = 175.
Q11103: What is the missing number: ? + 133 = 211
Answer: 78
💡 Missing number = 211 - 133 = 78; check: 133 + 78 = 211.
Q11104: What is the missing number: 26 + ? = 54
Answer: 28
💡 Missing number = 54 - 26 = 28; check: 26 + 28 = 54.
Q11105: What is the missing number: 21 + ? = 51
Answer: 30
💡 Missing number = 51 - 21 = 30; check: 21 + 30 = 51.
Q11106: What is the missing number: ? + 93 = 238
Answer: 145
💡 Missing number = 238 - 93 = 145; check: 93 + 145 = 238.
Q11107: What is the value of x if: x - 14 = 212
Answer: 226
💡 x = 212 + 14 = 226; check: 226 - 14 = 212.
Q11108: What is the missing number: ? × 11 = 44
Answer: 4
💡 Missing number = 44 ÷ 11 = 4; check: 4 × 11 = 44.
Q11109: What is the value of x if: x - 59 = 123
Answer: 182
💡 x = 123 + 59 = 182; check: 182 - 59 = 123.
Q11110: What is the missing number: 124 + ? = 220
Answer: 96
💡 Missing number = 220 - 124 = 96; check: 124 + 96 = 220.
Q11111: What is the value of x if: x - 11 = 10
Answer: 21
💡 x = 10 + 11 = 21; check: 21 - 11 = 10.
Q11112: What is the missing number: ? + 47 = 99
Answer: 52
💡 Missing number = 99 - 47 = 52; check: 47 + 52 = 99.
Q11113: What is the missing number: 58 + ? = 212
Answer: 154
💡 Missing number = 212 - 58 = 154; check: 58 + 154 = 212.
Q11114: What is the missing number: 158 + ? = 193
Answer: 35
💡 Missing number = 193 - 158 = 35; check: 158 + 35 = 193.
Q11115: What is the missing number: ? + 132 = 195
Answer: 63
💡 Missing number = 195 - 132 = 63; check: 132 + 63 = 195.
Q11116: What is the missing number: 94 + ? = 148
Answer: 54
💡 Missing number = 148 - 94 = 54; check: 94 + 54 = 148.
Q11117: What is the missing number: 46 + ? = 62
Answer: 16
💡 Missing number = 62 - 46 = 16; check: 46 + 16 = 62.
Q11118: What is the missing number: ? × 12 = 48
Answer: 4
💡 Missing number = 48 ÷ 12 = 4; check: 4 × 12 = 48.
Q11119: What is the missing number: 107 + ? = 125
Answer: 18
💡 Missing number = 125 - 107 = 18; check: 107 + 18 = 125.
Q11120: What is the missing number: 59 + ? = 79
Answer: 20
💡 Missing number = 79 - 59 = 20; check: 59 + 20 = 79.
Q11121: What is the missing number: 178 + ? = 340
Answer: 162
💡 Missing number = 340 - 178 = 162; check: 178 + 162 = 340.
Q11122: What is the missing number: 141 + ? = 207
Answer: 66
💡 Missing number = 207 - 141 = 66; check: 141 + 66 = 207.
Q11123: What is the value of x if: x - 85 = 112
Answer: 197
💡 x = 112 + 85 = 197; check: 197 - 85 = 112.
Q11124: What is the missing number: ? + 49 = 224
Answer: 175
💡 Missing number = 224 - 49 = 175; check: 49 + 175 = 224.
Q11125: What is the missing number: ? + 152 = 330
Answer: 178
💡 Missing number = 330 - 152 = 178; check: 152 + 178 = 330.
Q11126: What is the missing number: 81 + ? = 242
Answer: 161
💡 Missing number = 242 - 81 = 161; check: 81 + 161 = 242.
Q11127: What is the missing number: ? + 62 = 210
Answer: 148
💡 Missing number = 210 - 62 = 148; check: 62 + 148 = 210.
Q11128: What is the missing number: 111 + ? = 151
Answer: 40
💡 Missing number = 151 - 111 = 40; check: 111 + 40 = 151.
Q11129: What is the missing number: ? + 78 = 124
Answer: 46
💡 Missing number = 124 - 78 = 46; check: 78 + 46 = 124.
Q11130: What is the missing number: 127 + ? = 161
Answer: 34
💡 Missing number = 161 - 127 = 34; check: 127 + 34 = 161.
Q11131: What is the missing number: ? + 51 = 81
Answer: 30
💡 Missing number = 81 - 51 = 30; check: 51 + 30 = 81.
Q11132: What is the missing number: ? × 11 = 121
Answer: 11
💡 Missing number = 121 ÷ 11 = 11; check: 11 × 11 = 121.
Q11133: What is the missing number: ? + 10 = 187
Answer: 177
💡 Missing number = 187 - 10 = 177; check: 10 + 177 = 187.
Q11134: What is the missing number: 46 + ? = 179
Answer: 133
💡 Missing number = 179 - 46 = 133; check: 46 + 133 = 179.
Q11135: What is the missing number: 14 + ? = 68
Answer: 54
💡 Missing number = 68 - 14 = 54; check: 14 + 54 = 68.
Q11136: What is the value of x if: x - 5 = 5
Answer: 10
💡 x = 5 + 5 = 10; check: 10 - 5 = 5.
Q11137: What is the missing number: 126 + ? = 214
Answer: 88
💡 Missing number = 214 - 126 = 88; check: 126 + 88 = 214.
Q11138: What is the value of x if: x - 106 = 13
Answer: 119
💡 x = 13 + 106 = 119; check: 119 - 106 = 13.
Q11139: What is the missing number: ? + 92 = 113
Answer: 21
💡 Missing number = 113 - 92 = 21; check: 92 + 21 = 113.
Q11140: What is the missing number: ? + 150 = 191
Answer: 41
💡 Missing number = 191 - 150 = 41; check: 150 + 41 = 191.
Q11141: What is the missing number: ? + 94 = 118
Answer: 24
💡 Missing number = 118 - 94 = 24; check: 94 + 24 = 118.
Q11142: What is the missing number: 108 + ? = 169
Answer: 61
💡 Missing number = 169 - 108 = 61; check: 108 + 61 = 169.
Q11143: What is the value of x if: x - 137 = 94
Answer: 231
💡 x = 94 + 137 = 231; check: 231 - 137 = 94.
Q11144: What is the missing number: 4 + ? = 7
Answer: 3
💡 Missing number = 7 - 4 = 3; check: 4 + 3 = 7.
Q11145: What is the missing number: 133 + ? = 221
Answer: 88
💡 Missing number = 221 - 133 = 88; check: 133 + 88 = 221.
Q11146: What is the missing number: ? + 34 = 184
Answer: 150
💡 Missing number = 184 - 34 = 150; check: 34 + 150 = 184.
Q11147: What is the value of x if: x - 216 = 68
Answer: 284
💡 x = 68 + 216 = 284; check: 284 - 216 = 68.
Q11148: What is the missing number: 99 + ? = 276
Answer: 177
💡 Missing number = 276 - 99 = 177; check: 99 + 177 = 276.
Q11149: What is the missing number: ? + 88 = 262
Answer: 174
💡 Missing number = 262 - 88 = 174; check: 88 + 174 = 262.
Q11150: What is the missing number: ? × 10 = 120
Answer: 12
💡 Missing number = 120 ÷ 10 = 12; check: 12 × 10 = 120.
Q11151: What is the missing number: 86 + ? = 129
Answer: 43
💡 Missing number = 129 - 86 = 43; check: 86 + 43 = 129.
Q11152: What is the value of x if: x - 108 = 159
Answer: 267
💡 x = 159 + 108 = 267; check: 267 - 108 = 159.
Q11153: What is the missing number: 12 + ? = 160
Answer: 148
💡 Missing number = 160 - 12 = 148; check: 12 + 148 = 160.
Q11154: What is the missing number: 140 + ? = 198
Answer: 58
💡 Missing number = 198 - 140 = 58; check: 140 + 58 = 198.
Q11155: What is the missing number: ? × 11 = 88
Answer: 8
💡 Missing number = 88 ÷ 11 = 8; check: 8 × 11 = 88.
Q11156: What is the value of x if: x - 8 = 35
Answer: 43
💡 x = 35 + 8 = 43; check: 43 - 8 = 35.
Q11157: What is the missing number: ? + 28 = 60
Answer: 32
💡 Missing number = 60 - 28 = 32; check: 28 + 32 = 60.
Q11158: What is the value of x if: x - 21 = 119
Answer: 140
💡 x = 119 + 21 = 140; check: 140 - 21 = 119.
Q11159: What is the missing number: 88 + ? = 145
Answer: 57
💡 Missing number = 145 - 88 = 57; check: 88 + 57 = 145.
Q11160: What is the value of x if: x - 14 = 240
Answer: 254
💡 x = 240 + 14 = 254; check: 254 - 14 = 240.
Q11161: What is the missing number: ? + 139 = 215
Answer: 76
💡 Missing number = 215 - 139 = 76; check: 139 + 76 = 215.
Q11162: What is the value of x if: x - 78 = 10
Answer: 88
💡 x = 10 + 78 = 88; check: 88 - 78 = 10.
Q11163: What is the missing number: ? + 116 = 190
Answer: 74
💡 Missing number = 190 - 116 = 74; check: 116 + 74 = 190.
Q11164: What is the missing number: 60 + ? = 101
Answer: 41
💡 Missing number = 101 - 60 = 41; check: 60 + 41 = 101.
Q11165: What is the value of x if: x - 13 = 63
Answer: 76
💡 x = 63 + 13 = 76; check: 76 - 13 = 63.
Q11166: What is the missing number: 64 + ? = 227
Answer: 163
💡 Missing number = 227 - 64 = 163; check: 64 + 163 = 227.
Q11167: What is the missing number: ? + 78 = 141
Answer: 63
💡 Missing number = 141 - 78 = 63; check: 78 + 63 = 141.
Q11168: What is the missing number: 174 + ? = 270
Answer: 96
💡 Missing number = 270 - 174 = 96; check: 174 + 96 = 270.
Q11169: What is the value of x if: x - 228 = 68
Answer: 296
💡 x = 68 + 228 = 296; check: 296 - 228 = 68.
Q11170: What is the missing number: 28 + ? = 33
Answer: 5
💡 Missing number = 33 - 28 = 5; check: 28 + 5 = 33.
Q11171: What is the missing number: ? + 2 = 147
Answer: 145
💡 Missing number = 147 - 2 = 145; check: 2 + 145 = 147.
Q11172: What is the missing number: 37 + ? = 166
Answer: 129
💡 Missing number = 166 - 37 = 129; check: 37 + 129 = 166.
Q11173: What is the missing number: ? × 5 = 25
Answer: 5
💡 Missing number = 25 ÷ 5 = 5; check: 5 × 5 = 25.
Q11174: What is the missing number: 29 + ? = 37
Answer: 8
💡 Missing number = 37 - 29 = 8; check: 29 + 8 = 37.
Q11175: What is the value of x if: x - 9 = 74
Answer: 83
💡 x = 74 + 9 = 83; check: 83 - 9 = 74.
Q11176: What is the missing number: ? + 173 = 176
Answer: 3
💡 Missing number = 176 - 173 = 3; check: 173 + 3 = 176.
Q11177: What is the missing number: ? + 180 = 299
Answer: 119
💡 Missing number = 299 - 180 = 119; check: 180 + 119 = 299.
Q11178: What is the missing number: 176 + ? = 243
Answer: 67
💡 Missing number = 243 - 176 = 67; check: 176 + 67 = 243.
Q11179: What is the missing number: ? + 106 = 128
Answer: 22
💡 Missing number = 128 - 106 = 22; check: 106 + 22 = 128.
Q11180: What is the value of x if: x - 73 = 99
Answer: 172
💡 x = 99 + 73 = 172; check: 172 - 73 = 99.
Q11181: What is the missing number: ? + 133 = 250
Answer: 117
💡 Missing number = 250 - 133 = 117; check: 133 + 117 = 250.
Q11182: What is the value of x if: x - 64 = 233
Answer: 297
💡 x = 233 + 64 = 297; check: 297 - 64 = 233.
Q11183: What is the value of x if: x - 8 = 105
Answer: 113
💡 x = 105 + 8 = 113; check: 113 - 8 = 105.
Q11184: What is the missing number: 16 + ? = 132
Answer: 116
💡 Missing number = 132 - 16 = 116; check: 16 + 116 = 132.
Q11185: What is the missing number: 133 + ? = 272
Answer: 139
💡 Missing number = 272 - 133 = 139; check: 133 + 139 = 272.
Q11186: What is the value of x if: x - 26 = 26
Answer: 52
💡 x = 26 + 26 = 52; check: 52 - 26 = 26.
Q11187: What is the missing number: ? + 122 = 126
Answer: 4
💡 Missing number = 126 - 122 = 4; check: 122 + 4 = 126.
Q11188: What is the value of x if: x - 214 = 79
Answer: 293
💡 x = 79 + 214 = 293; check: 293 - 214 = 79.
Q11189: What is the missing number: ? + 21 = 123
Answer: 102
💡 Missing number = 123 - 21 = 102; check: 21 + 102 = 123.
Q11190: What is the missing number: ? + 45 = 51
Answer: 6
💡 Missing number = 51 - 45 = 6; check: 45 + 6 = 51.
Q11191: What is the missing number: ? + 53 = 162
Answer: 109
💡 Missing number = 162 - 53 = 109; check: 53 + 109 = 162.
Q11192: What is the value of x if: x - 188 = 75
Answer: 263
💡 x = 75 + 188 = 263; check: 263 - 188 = 75.
Q11193: What is the value of x if: x - 48 = 203
Answer: 251
💡 x = 203 + 48 = 251; check: 251 - 48 = 203.
Q11194: What is the missing number: ? × 2 = 6
Answer: 3
💡 Missing number = 6 ÷ 2 = 3; check: 3 × 2 = 6.
Q11195: What is the missing number: ? + 84 = 229
Answer: 145
💡 Missing number = 229 - 84 = 145; check: 84 + 145 = 229.
Q11196: What is the missing number: ? + 78 = 207
Answer: 129
💡 Missing number = 207 - 78 = 129; check: 78 + 129 = 207.
Q11197: What is the value of x if: x - 123 = 131
Answer: 254
💡 x = 131 + 123 = 254; check: 254 - 123 = 131.
Q11198: What is the missing number: 6 + ? = 26
Answer: 20
💡 Missing number = 26 - 6 = 20; check: 6 + 20 = 26.
Q11199: What is the missing number: ? + 115 = 284
Answer: 169
💡 Missing number = 284 - 115 = 169; check: 115 + 169 = 284.
Q11200: What is the missing number: ? + 145 = 193
Answer: 48
💡 Missing number = 193 - 145 = 48; check: 145 + 48 = 193.
Q11201: What is the missing number: 115 + ? = 234
Answer: 119
💡 Missing number = 234 - 115 = 119; check: 115 + 119 = 234.
Q11202: What is the missing number: ? + 12 = 157
Answer: 145
💡 Missing number = 157 - 12 = 145; check: 12 + 145 = 157.
Q11203: What is the missing number: ? + 99 = 170
Answer: 71
💡 Missing number = 170 - 99 = 71; check: 99 + 71 = 170.
Q11204: What is the missing number: ? + 173 = 285
Answer: 112
💡 Missing number = 285 - 173 = 112; check: 173 + 112 = 285.
Q11205: What is the missing number: ? + 77 = 195
Answer: 118
💡 Missing number = 195 - 77 = 118; check: 77 + 118 = 195.
Q11206: What is the missing number: 24 + ? = 71
Answer: 47
💡 Missing number = 71 - 24 = 47; check: 24 + 47 = 71.
Q11207: What is the missing number: ? + 80 = 229
Answer: 149
💡 Missing number = 229 - 80 = 149; check: 80 + 149 = 229.
Q11208: What is the value of x if: x - 8 = 11
Answer: 19
💡 x = 11 + 8 = 19; check: 19 - 8 = 11.
Q11209: What is the value of x if: x - 236 = 43
Answer: 279
💡 x = 43 + 236 = 279; check: 279 - 236 = 43.
Q11210: What is the value of x if: x - 86 = 121
Answer: 207
💡 x = 121 + 86 = 207; check: 207 - 86 = 121.
Q11211: What is the missing number: ? + 79 = 166
Answer: 87
💡 Missing number = 166 - 79 = 87; check: 79 + 87 = 166.
Q11212: What is the missing number: 167 + ? = 195
Answer: 28
💡 Missing number = 195 - 167 = 28; check: 167 + 28 = 195.
Q11213: What is the value of x if: x - 186 = 30
Answer: 216
💡 x = 30 + 186 = 216; check: 216 - 186 = 30.
Q11214: What is the missing number: ? + 104 = 270
Answer: 166
💡 Missing number = 270 - 104 = 166; check: 104 + 166 = 270.
Q11215: What is the value of x if: x - 48 = 102
Answer: 150
💡 x = 102 + 48 = 150; check: 150 - 48 = 102.
Q11216: What is the missing number: 124 + ? = 276
Answer: 152
💡 Missing number = 276 - 124 = 152; check: 124 + 152 = 276.
Q11217: What is the missing number: 108 + ? = 146
Answer: 38
💡 Missing number = 146 - 108 = 38; check: 108 + 38 = 146.
Q11218: What is the missing number: 161 + ? = 204
Answer: 43
💡 Missing number = 204 - 161 = 43; check: 161 + 43 = 204.
Q11219: What is the missing number: ? + 140 = 219
Answer: 79
💡 Missing number = 219 - 140 = 79; check: 140 + 79 = 219.
Q11220: What is the missing number: 131 + ? = 193
Answer: 62
💡 Missing number = 193 - 131 = 62; check: 131 + 62 = 193.
Q11221: What is the missing number: ? + 24 = 188
Answer: 164
💡 Missing number = 188 - 24 = 164; check: 24 + 164 = 188.
Q11222: What is the value of x if: x - 72 = 100
Answer: 172
💡 x = 100 + 72 = 172; check: 172 - 72 = 100.
Q11223: What is the missing number: 4 + ? = 182
Answer: 178
💡 Missing number = 182 - 4 = 178; check: 4 + 178 = 182.
Q11224: What is the value of x if: x - 90 = 41
Answer: 131
💡 x = 41 + 90 = 131; check: 131 - 90 = 41.
Q11225: What is the missing number: ? + 119 = 151
Answer: 32
💡 Missing number = 151 - 119 = 32; check: 119 + 32 = 151.
Q11226: What is the missing number: 73 + ? = 242
Answer: 169
💡 Missing number = 242 - 73 = 169; check: 73 + 169 = 242.
Q11227: What is the missing number: ? × 8 = 24
Answer: 3
💡 Missing number = 24 ÷ 8 = 3; check: 3 × 8 = 24.
Q11228: What is the value of x if: x - 233 = 13
Answer: 246
💡 x = 13 + 233 = 246; check: 246 - 233 = 13.
Q11229: What is the missing number: ? + 88 = 232
Answer: 144
💡 Missing number = 232 - 88 = 144; check: 88 + 144 = 232.
Q11230: What is the missing number: 39 + ? = 202
Answer: 163
💡 Missing number = 202 - 39 = 163; check: 39 + 163 = 202.
Q11231: What is the missing number: ? + 125 = 305
Answer: 180
💡 Missing number = 305 - 125 = 180; check: 125 + 180 = 305.
Q11232: What is the missing number: 77 + ? = 113
Answer: 36
💡 Missing number = 113 - 77 = 36; check: 77 + 36 = 113.
Q11233: What is the missing number: 95 + ? = 123
Answer: 28
💡 Missing number = 123 - 95 = 28; check: 95 + 28 = 123.
Q11234: What is the value of x if: x - 7 = 143
Answer: 150
💡 x = 143 + 7 = 150; check: 150 - 7 = 143.
Q11235: What is the value of x if: x - 15 = 44
Answer: 59
💡 x = 44 + 15 = 59; check: 59 - 15 = 44.
Q11236: What is the missing number: 90 + ? = 136
Answer: 46
💡 Missing number = 136 - 90 = 46; check: 90 + 46 = 136.
Q11237: What is the value of x if: x - 252 = 17
Answer: 269
💡 x = 17 + 252 = 269; check: 269 - 252 = 17.
Q11238: What is the missing number: ? × 8 = 96
Answer: 12
💡 Missing number = 96 ÷ 8 = 12; check: 12 × 8 = 96.
Q11239: What is the value of x if: x - 143 = 29
Answer: 172
💡 x = 29 + 143 = 172; check: 172 - 143 = 29.
Q11240: What is the missing number: 21 + ? = 153
Answer: 132
💡 Missing number = 153 - 21 = 132; check: 21 + 132 = 153.
Q11241: What is the value of x if: x - 66 = 56
Answer: 122
💡 x = 56 + 66 = 122; check: 122 - 66 = 56.
Q11242: What is the value of x if: x - 23 = 199
Answer: 222
💡 x = 199 + 23 = 222; check: 222 - 23 = 199.
Q11243: What is the value of x if: x - 92 = 43
Answer: 135
💡 x = 43 + 92 = 135; check: 135 - 92 = 43.
Q11244: What is the missing number: 156 + ? = 225
Answer: 69
💡 Missing number = 225 - 156 = 69; check: 156 + 69 = 225.
Q11245: What is the missing number: ? + 141 = 260
Answer: 119
💡 Missing number = 260 - 141 = 119; check: 141 + 119 = 260.
Q11246: What is the missing number: 31 + ? = 128
Answer: 97
💡 Missing number = 128 - 31 = 97; check: 31 + 97 = 128.
Q11247: What is the missing number: 90 + ? = 270
Answer: 180
💡 Missing number = 270 - 90 = 180; check: 90 + 180 = 270.
Q11248: What is the missing number: 151 + ? = 159
Answer: 8
💡 Missing number = 159 - 151 = 8; check: 151 + 8 = 159.
Q11249: What is the value of x if: x - 18 = 3
Answer: 21
💡 x = 3 + 18 = 21; check: 21 - 18 = 3.
Q11250: What is the value of x if: x - 178 = 43
Answer: 221
💡 x = 43 + 178 = 221; check: 221 - 178 = 43.
Q11251: What is the missing number: 135 + ? = 245
Answer: 110
💡 Missing number = 245 - 135 = 110; check: 135 + 110 = 245.
Q11252: What is the missing number: ? + 127 = 154
Answer: 27
💡 Missing number = 154 - 127 = 27; check: 127 + 27 = 154.
Q11253: What is the missing number: 79 + ? = 194
Answer: 115
💡 Missing number = 194 - 79 = 115; check: 79 + 115 = 194.
Q11254: What is the missing number: 159 + ? = 207
Answer: 48
💡 Missing number = 207 - 159 = 48; check: 159 + 48 = 207.
Q11255: What is the value of x if: x - 58 = 229
Answer: 287
💡 x = 229 + 58 = 287; check: 287 - 58 = 229.
Q11256: What is the missing number: ? + 2 = 162
Answer: 160
💡 Missing number = 162 - 2 = 160; check: 2 + 160 = 162.
Q11257: What is the missing number: ? × 4 = 36
Answer: 9
💡 Missing number = 36 ÷ 4 = 9; check: 9 × 4 = 36.
Q11258: What is the missing number: 71 + ? = 240
Answer: 169
💡 Missing number = 240 - 71 = 169; check: 71 + 169 = 240.
Q11259: What is the missing number: ? + 167 = 173
Answer: 6
💡 Missing number = 173 - 167 = 6; check: 167 + 6 = 173.
Q11260: What is the missing number: ? + 120 = 175
Answer: 55
💡 Missing number = 175 - 120 = 55; check: 120 + 55 = 175.
Q11261: What is the value of x if: x - 134 = 112
Answer: 246
💡 x = 112 + 134 = 246; check: 246 - 134 = 112.
Q11262: What is the value of x if: x - 30 = 13
Answer: 43
💡 x = 13 + 30 = 43; check: 43 - 30 = 13.
Q11263: What is the value of x if: x - 22 = 33
Answer: 55
💡 x = 33 + 22 = 55; check: 55 - 22 = 33.
Q11264: What is the missing number: ? + 43 = 103
Answer: 60
💡 Missing number = 103 - 43 = 60; check: 43 + 60 = 103.
Q11265: What is the missing number: 102 + ? = 196
Answer: 94
💡 Missing number = 196 - 102 = 94; check: 102 + 94 = 196.
Q11266: What is the missing number: 82 + ? = 89
Answer: 7
💡 Missing number = 89 - 82 = 7; check: 82 + 7 = 89.
Q11267: What is the value of x if: x - 62 = 71
Answer: 133
💡 x = 71 + 62 = 133; check: 133 - 62 = 71.
Q11268: What is the missing number: ? + 115 = 178
Answer: 63
💡 Missing number = 178 - 115 = 63; check: 115 + 63 = 178.
Q11269: What is the value of x if: x - 3 = 39
Answer: 42
💡 x = 39 + 3 = 42; check: 42 - 3 = 39.
Q11270: What is the missing number: 65 + ? = 93
Answer: 28
💡 Missing number = 93 - 65 = 28; check: 65 + 28 = 93.
Q11271: What is the missing number: ? + 111 = 156
Answer: 45
💡 Missing number = 156 - 111 = 45; check: 111 + 45 = 156.
Q11272: What is the missing number: 87 + ? = 124
Answer: 37
💡 Missing number = 124 - 87 = 37; check: 87 + 37 = 124.
Q11273: What is the missing number: ? + 108 = 271
Answer: 163
💡 Missing number = 271 - 108 = 163; check: 108 + 163 = 271.
Q11274: What is the value of x if: x - 16 = 61
Answer: 77
💡 x = 61 + 16 = 77; check: 77 - 16 = 61.
Q11275: What is the value of x if: x - 111 = 105
Answer: 216
💡 x = 105 + 111 = 216; check: 216 - 111 = 105.
Q11276: What is the value of x if: x - 79 = 30
Answer: 109
💡 x = 30 + 79 = 109; check: 109 - 79 = 30.
Q11277: What is the missing number: 42 + ? = 205
Answer: 163
💡 Missing number = 205 - 42 = 163; check: 42 + 163 = 205.
Q11278: What is the missing number: ? × 7 = 21
Answer: 3
💡 Missing number = 21 ÷ 7 = 3; check: 3 × 7 = 21.
Q11279: What is the missing number: ? × 4 = 32
Answer: 8
💡 Missing number = 32 ÷ 4 = 8; check: 8 × 4 = 32.
Q11280: What is the value of x if: x - 197 = 54
Answer: 251
💡 x = 54 + 197 = 251; check: 251 - 197 = 54.
Q11281: What is the missing number: ? + 170 = 245
Answer: 75
💡 Missing number = 245 - 170 = 75; check: 170 + 75 = 245.
Q11282: What is the missing number: ? + 25 = 27
Answer: 2
💡 Missing number = 27 - 25 = 2; check: 25 + 2 = 27.
Q11283: What is the value of x if: x - 69 = 47
Answer: 116
💡 x = 47 + 69 = 116; check: 116 - 69 = 47.
Q11284: What is the missing number: 119 + ? = 185
Answer: 66
💡 Missing number = 185 - 119 = 66; check: 119 + 66 = 185.
Q11285: What is the missing number: ? + 153 = 279
Answer: 126
💡 Missing number = 279 - 153 = 126; check: 153 + 126 = 279.
Q11286: What is the value of x if: x - 80 = 27
Answer: 107
💡 x = 27 + 80 = 107; check: 107 - 80 = 27.
Q11287: What is the missing number: 152 + ? = 298
Answer: 146
💡 Missing number = 298 - 152 = 146; check: 152 + 146 = 298.
Q11288: What is the missing number: ? + 140 = 315
Answer: 175
💡 Missing number = 315 - 140 = 175; check: 140 + 175 = 315.
Q11289: What is the missing number: ? + 39 = 196
Answer: 157
💡 Missing number = 196 - 39 = 157; check: 39 + 157 = 196.
Q11290: What is the missing number: ? + 67 = 223
Answer: 156
💡 Missing number = 223 - 67 = 156; check: 67 + 156 = 223.
Q11291: What is the missing number: ? + 127 = 301
Answer: 174
💡 Missing number = 301 - 127 = 174; check: 127 + 174 = 301.
Q11292: What is the missing number: ? + 132 = 202
Answer: 70
💡 Missing number = 202 - 132 = 70; check: 132 + 70 = 202.
Q11293: What is the missing number: ? + 56 = 65
Answer: 9
💡 Missing number = 65 - 56 = 9; check: 56 + 9 = 65.
Q11294: What is the missing number: 31 + ? = 38
Answer: 7
💡 Missing number = 38 - 31 = 7; check: 31 + 7 = 38.
Q11295: What is the missing number: 83 + ? = 175
Answer: 92
💡 Missing number = 175 - 83 = 92; check: 83 + 92 = 175.
Q11296: What is the missing number: ? + 155 = 260
Answer: 105
💡 Missing number = 260 - 155 = 105; check: 155 + 105 = 260.
Q11297: What is the missing number: 58 + ? = 64
Answer: 6
💡 Missing number = 64 - 58 = 6; check: 58 + 6 = 64.
Q11298: What is the missing number: 29 + ? = 192
Answer: 163
💡 Missing number = 192 - 29 = 163; check: 29 + 163 = 192.
Q11299: What is the value of x if: x - 42 = 246
Answer: 288
💡 x = 246 + 42 = 288; check: 288 - 42 = 246.
Q11300: What is the missing number: ? × 10 = 40
Answer: 4
💡 Missing number = 40 ÷ 10 = 4; check: 4 × 10 = 40.
Q11301: What is the missing number: ? + 73 = 117
Answer: 44
💡 Missing number = 117 - 73 = 44; check: 73 + 44 = 117.
Q11302: What is the missing number: ? × 8 = 80
Answer: 10
💡 Missing number = 80 ÷ 8 = 10; check: 10 × 8 = 80.
Q11303: What is the missing number: 99 + ? = 118
Answer: 19
💡 Missing number = 118 - 99 = 19; check: 99 + 19 = 118.
Q11304: What is the missing number: 33 + ? = 50
Answer: 17
💡 Missing number = 50 - 33 = 17; check: 33 + 17 = 50.
Q11305: What is the missing number: ? + 2 = 24
Answer: 22
💡 Missing number = 24 - 2 = 22; check: 2 + 22 = 24.
Q11306: What is the value of x if: x - 159 = 8
Answer: 167
💡 x = 8 + 159 = 167; check: 167 - 159 = 8.
Q11307: What is the missing number: 51 + ? = 121
Answer: 70
💡 Missing number = 121 - 51 = 70; check: 51 + 70 = 121.
Q11308: What is the missing number: ? + 132 = 275
Answer: 143
💡 Missing number = 275 - 132 = 143; check: 132 + 143 = 275.
Q11309: What is the value of x if: x - 17 = 7
Answer: 24
💡 x = 7 + 17 = 24; check: 24 - 17 = 7.
Q11310: What is the missing number: ? + 73 = 226
Answer: 153
💡 Missing number = 226 - 73 = 153; check: 73 + 153 = 226.
Q11311: What is the missing number: 26 + ? = 186
Answer: 160
💡 Missing number = 186 - 26 = 160; check: 26 + 160 = 186.
Q11312: What is the missing number: ? + 113 = 155
Answer: 42
💡 Missing number = 155 - 113 = 42; check: 113 + 42 = 155.
Q11313: What is the missing number: ? + 114 = 266
Answer: 152
💡 Missing number = 266 - 114 = 152; check: 114 + 152 = 266.
Q11314: What is the value of x if: x - 240 = 18
Answer: 258
💡 x = 18 + 240 = 258; check: 258 - 240 = 18.
Q11315: What is the value of x if: x - 24 = 145
Answer: 169
💡 x = 145 + 24 = 169; check: 169 - 24 = 145.
Q11316: What is the missing number: ? + 21 = 71
Answer: 50
💡 Missing number = 71 - 21 = 50; check: 21 + 50 = 71.
Q11317: What is the missing number: ? + 28 = 105
Answer: 77
💡 Missing number = 105 - 28 = 77; check: 28 + 77 = 105.
Q11318: What is the missing number: 131 + ? = 246
Answer: 115
💡 Missing number = 246 - 131 = 115; check: 131 + 115 = 246.
Q11319: What is the value of x if: x - 34 = 79
Answer: 113
💡 x = 79 + 34 = 113; check: 113 - 34 = 79.
Q11320: What is the value of x if: x - 23 = 49
Answer: 72
💡 x = 49 + 23 = 72; check: 72 - 23 = 49.
Q11321: What is the missing number: 32 + ? = 128
Answer: 96
💡 Missing number = 128 - 32 = 96; check: 32 + 96 = 128.
Q11322: What is the missing number: 94 + ? = 122
Answer: 28
💡 Missing number = 122 - 94 = 28; check: 94 + 28 = 122.
Q11323: What is the missing number: 97 + ? = 266
Answer: 169
💡 Missing number = 266 - 97 = 169; check: 97 + 169 = 266.
Q11324: What is the value of x if: x - 113 = 128
Answer: 241
💡 x = 128 + 113 = 241; check: 241 - 113 = 128.
Q11325: What is the missing number: ? + 131 = 153
Answer: 22
💡 Missing number = 153 - 131 = 22; check: 131 + 22 = 153.
Q11326: What is the missing number: ? + 97 = 194
Answer: 97
💡 Missing number = 194 - 97 = 97; check: 97 + 97 = 194.
Q11327: What is the value of x if: x - 26 = 78
Answer: 104
💡 x = 78 + 26 = 104; check: 104 - 26 = 78.
Q11328: What is the missing number: 144 + ? = 243
Answer: 99
💡 Missing number = 243 - 144 = 99; check: 144 + 99 = 243.
Q11329: What is the missing number: ? + 93 = 121
Answer: 28
💡 Missing number = 121 - 93 = 28; check: 93 + 28 = 121.
Q11330: What is the missing number: ? × 6 = 72
Answer: 12
💡 Missing number = 72 ÷ 6 = 12; check: 12 × 6 = 72.
Q11331: What is the missing number: 24 + ? = 173
Answer: 149
💡 Missing number = 173 - 24 = 149; check: 24 + 149 = 173.
Q11332: What is the missing number: ? + 135 = 206
Answer: 71
💡 Missing number = 206 - 135 = 71; check: 135 + 71 = 206.
Q11333: What is the missing number: ? + 20 = 50
Answer: 30
💡 Missing number = 50 - 20 = 30; check: 20 + 30 = 50.
Q11334: What is the missing number: ? + 74 = 81
Answer: 7
💡 Missing number = 81 - 74 = 7; check: 74 + 7 = 81.
Q11335: What is the missing number: 68 + ? = 191
Answer: 123
💡 Missing number = 191 - 68 = 123; check: 68 + 123 = 191.
Q11336: What is the missing number: ? × 6 = 66
Answer: 11
💡 Missing number = 66 ÷ 6 = 11; check: 11 × 6 = 66.
Q11337: What is the value of x if: x - 2 = 127
Answer: 129
💡 x = 127 + 2 = 129; check: 129 - 2 = 127.
Q11338: What is the value of x if: x - 17 = 12
Answer: 29
💡 x = 12 + 17 = 29; check: 29 - 17 = 12.
Q11339: What is the missing number: 74 + ? = 212
Answer: 138
💡 Missing number = 212 - 74 = 138; check: 74 + 138 = 212.
Q11340: What is the missing number: 141 + ? = 320
Answer: 179
💡 Missing number = 320 - 141 = 179; check: 141 + 179 = 320.
Q11341: What is the missing number: ? + 72 = 140
Answer: 68
💡 Missing number = 140 - 72 = 68; check: 72 + 68 = 140.
Q11342: What is the value of x if: x - 10 = 75
Answer: 85
💡 x = 75 + 10 = 85; check: 85 - 10 = 75.
Q11343: What is the missing number: 154 + ? = 246
Answer: 92
💡 Missing number = 246 - 154 = 92; check: 154 + 92 = 246.
Q11344: What is the missing number: 160 + ? = 235
Answer: 75
💡 Missing number = 235 - 160 = 75; check: 160 + 75 = 235.
Q11345: What is the missing number: 78 + ? = 180
Answer: 102
💡 Missing number = 180 - 78 = 102; check: 78 + 102 = 180.
Q11346: What is the missing number: ? + 50 = 226
Answer: 176
💡 Missing number = 226 - 50 = 176; check: 50 + 176 = 226.
Q11347: What is the missing number: 59 + ? = 73
Answer: 14
💡 Missing number = 73 - 59 = 14; check: 59 + 14 = 73.
Q11348: What is the missing number: ? + 120 = 221
Answer: 101
💡 Missing number = 221 - 120 = 101; check: 120 + 101 = 221.
Q11349: What is the value of x if: x - 30 = 236
Answer: 266
💡 x = 236 + 30 = 266; check: 266 - 30 = 236.
Q11350: What is the value of x if: x - 33 = 37
Answer: 70
💡 x = 37 + 33 = 70; check: 70 - 33 = 37.
Q11351: What is the missing number: 52 + ? = 196
Answer: 144
💡 Missing number = 196 - 52 = 144; check: 52 + 144 = 196.
Q11352: What is the missing number: 109 + ? = 234
Answer: 125
💡 Missing number = 234 - 109 = 125; check: 109 + 125 = 234.
Q11353: What is the missing number: 10 + ? = 19
Answer: 9
💡 Missing number = 19 - 10 = 9; check: 10 + 9 = 19.
Q11354: What is the missing number: 72 + ? = 187
Answer: 115
💡 Missing number = 187 - 72 = 115; check: 72 + 115 = 187.
Q11355: What is the missing number: ? × 3 = 18
Answer: 6
💡 Missing number = 18 ÷ 3 = 6; check: 6 × 3 = 18.
Q11356: What is the missing number: 20 + ? = 89
Answer: 69
💡 Missing number = 89 - 20 = 69; check: 20 + 69 = 89.
Q11357: What is the missing number: ? + 112 = 241
Answer: 129
💡 Missing number = 241 - 112 = 129; check: 112 + 129 = 241.
Q11358: What is the missing number: 163 + ? = 274
Answer: 111
💡 Missing number = 274 - 163 = 111; check: 163 + 111 = 274.
Q11359: What is the value of x if: x - 3 = 188
Answer: 191
💡 x = 188 + 3 = 191; check: 191 - 3 = 188.
Q11360: What is the missing number: ? + 163 = 306
Answer: 143
💡 Missing number = 306 - 163 = 143; check: 163 + 143 = 306.
Q11361: What is the value of x if: x - 4 = 159
Answer: 163
💡 x = 159 + 4 = 163; check: 163 - 4 = 159.
Q11362: What is the missing number: 44 + ? = 169
Answer: 125
💡 Missing number = 169 - 44 = 125; check: 44 + 125 = 169.
Q11363: What is the missing number: 58 + ? = 191
Answer: 133
💡 Missing number = 191 - 58 = 133; check: 58 + 133 = 191.
Q11364: What is the missing number: 149 + ? = 192
Answer: 43
💡 Missing number = 192 - 149 = 43; check: 149 + 43 = 192.
Q11365: What is the missing number: 156 + ? = 290
Answer: 134
💡 Missing number = 290 - 156 = 134; check: 156 + 134 = 290.
Q11366: What is the missing number: ? + 102 = 156
Answer: 54
💡 Missing number = 156 - 102 = 54; check: 102 + 54 = 156.
Q11367: What is the value of x if: x - 20 = 103
Answer: 123
💡 x = 103 + 20 = 123; check: 123 - 20 = 103.
Q11368: What is the missing number: 178 + ? = 226
Answer: 48
💡 Missing number = 226 - 178 = 48; check: 178 + 48 = 226.
Q11369: What is the value of x if: x - 39 = 6
Answer: 45
💡 x = 6 + 39 = 45; check: 45 - 39 = 6.
Q11370: What is the value of x if: x - 128 = 79
Answer: 207
💡 x = 79 + 128 = 207; check: 207 - 128 = 79.
Q11371: What is the value of x if: x - 25 = 234
Answer: 259
💡 x = 234 + 25 = 259; check: 259 - 25 = 234.
Q11372: What is the missing number: 164 + ? = 335
Answer: 171
💡 Missing number = 335 - 164 = 171; check: 164 + 171 = 335.
Q11373: What is the value of x if: x - 2 = 131
Answer: 133
💡 x = 131 + 2 = 133; check: 133 - 2 = 131.
Q11374: What is the missing number: 5 + ? = 179
Answer: 174
💡 Missing number = 179 - 5 = 174; check: 5 + 174 = 179.
Q11375: What is the missing number: 67 + ? = 166
Answer: 99
💡 Missing number = 166 - 67 = 99; check: 67 + 99 = 166.
Q11376: What is the value of x if: x - 8 = 4
Answer: 12
💡 x = 4 + 8 = 12; check: 12 - 8 = 4.
Q11377: What is the value of x if: x - 13 = 131
Answer: 144
💡 x = 131 + 13 = 144; check: 144 - 13 = 131.
Q11378: What is the missing number: ? × 12 = 96
Answer: 8
💡 Missing number = 96 ÷ 12 = 8; check: 8 × 12 = 96.
Q11379: What is the missing number: 169 + ? = 239
Answer: 70
💡 Missing number = 239 - 169 = 70; check: 169 + 70 = 239.
Q11380: What is the missing number: ? × 2 = 4
Answer: 2
💡 Missing number = 4 ÷ 2 = 2; check: 2 × 2 = 4.
Q11381: What is the value of x if: x - 218 = 80
Answer: 298
💡 x = 80 + 218 = 298; check: 298 - 218 = 80.
Q11382: What is the missing number: ? + 159 = 252
Answer: 93
💡 Missing number = 252 - 159 = 93; check: 159 + 93 = 252.
Q11383: What is the value of x if: x - 113 = 21
Answer: 134
💡 x = 21 + 113 = 134; check: 134 - 113 = 21.
Q11384: What is the missing number: ? × 8 = 16
Answer: 2
💡 Missing number = 16 ÷ 8 = 2; check: 2 × 8 = 16.
Q11385: What is the value of x if: x - 20 = 158
Answer: 178
💡 x = 158 + 20 = 178; check: 178 - 20 = 158.
Q11386: What is the missing number: 62 + ? = 210
Answer: 148
💡 Missing number = 210 - 62 = 148; check: 62 + 148 = 210.
Q11387: What is the missing number: ? + 128 = 197
Answer: 69
💡 Missing number = 197 - 128 = 69; check: 128 + 69 = 197.
Q11388: What is the missing number: ? + 91 = 268
Answer: 177
💡 Missing number = 268 - 91 = 177; check: 91 + 177 = 268.
Q11389: What is the missing number: 14 + ? = 71
Answer: 57
💡 Missing number = 71 - 14 = 57; check: 14 + 57 = 71.
Q11390: What is the missing number: ? + 168 = 287
Answer: 119
💡 Missing number = 287 - 168 = 119; check: 168 + 119 = 287.
Q11391: What is the missing number: ? + 149 = 213
Answer: 64
💡 Missing number = 213 - 149 = 64; check: 149 + 64 = 213.
Q11392: What is the missing number: ? × 11 = 66
Answer: 6
💡 Missing number = 66 ÷ 11 = 6; check: 6 × 11 = 66.
Q11393: What is the missing number: ? + 12 = 28
Answer: 16
💡 Missing number = 28 - 12 = 16; check: 12 + 16 = 28.
Q11394: What is the missing number: 139 + ? = 218
Answer: 79
💡 Missing number = 218 - 139 = 79; check: 139 + 79 = 218.
Q11395: What is the missing number: 62 + ? = 73
Answer: 11
💡 Missing number = 73 - 62 = 11; check: 62 + 11 = 73.
Q11396: What is the missing number: ? + 154 = 214
Answer: 60
💡 Missing number = 214 - 154 = 60; check: 154 + 60 = 214.
Q11397: What is the value of x if: x - 61 = 130
Answer: 191
💡 x = 130 + 61 = 191; check: 191 - 61 = 130.
Q11398: What is the value of x if: x - 98 = 11
Answer: 109
💡 x = 11 + 98 = 109; check: 109 - 98 = 11.
Q11399: What is the value of x if: x - 88 = 129
Answer: 217
💡 x = 129 + 88 = 217; check: 217 - 88 = 129.
Q11400: What is the missing number: 143 + ? = 288
Answer: 145
💡 Missing number = 288 - 143 = 145; check: 143 + 145 = 288.
Q11401: What is the missing number: ? + 37 = 157
Answer: 120
💡 Missing number = 157 - 37 = 120; check: 37 + 120 = 157.
Q11402: What is the missing number: 91 + ? = 241
Answer: 150
💡 Missing number = 241 - 91 = 150; check: 91 + 150 = 241.
Q11403: What is the missing number: 132 + ? = 139
Answer: 7
💡 Missing number = 139 - 132 = 7; check: 132 + 7 = 139.
Q11404: What is the missing number: 20 + ? = 112
Answer: 92
💡 Missing number = 112 - 20 = 92; check: 20 + 92 = 112.
Q11405: What is the value of x if: x - 3 = 198
Answer: 201
💡 x = 198 + 3 = 201; check: 201 - 3 = 198.
Q11406: What is the missing number: 9 + ? = 108
Answer: 99
💡 Missing number = 108 - 9 = 99; check: 9 + 99 = 108.
Q11407: What is the missing number: 167 + ? = 207
Answer: 40
💡 Missing number = 207 - 167 = 40; check: 167 + 40 = 207.
Q11408: What is the missing number: ? + 154 = 234
Answer: 80
💡 Missing number = 234 - 154 = 80; check: 154 + 80 = 234.
Q11409: What is the missing number: 25 + ? = 89
Answer: 64
💡 Missing number = 89 - 25 = 64; check: 25 + 64 = 89.
Q11410: What is the missing number: 45 + ? = 76
Answer: 31
💡 Missing number = 76 - 45 = 31; check: 45 + 31 = 76.
Q11411: What is the missing number: ? + 89 = 197
Answer: 108
💡 Missing number = 197 - 89 = 108; check: 89 + 108 = 197.
Q11412: What is the value of x if: x - 158 = 64
Answer: 222
💡 x = 64 + 158 = 222; check: 222 - 158 = 64.
Q11413: What is the value of x if: x - 28 = 174
Answer: 202
💡 x = 174 + 28 = 202; check: 202 - 28 = 174.
Q11414: What is the missing number: ? + 43 = 210
Answer: 167
💡 Missing number = 210 - 43 = 167; check: 43 + 167 = 210.
Q11415: What is the missing number: ? + 144 = 174
Answer: 30
💡 Missing number = 174 - 144 = 30; check: 144 + 30 = 174.
Q11416: What is the missing number: ? + 125 = 254
Answer: 129
💡 Missing number = 254 - 125 = 129; check: 125 + 129 = 254.
Q11417: What is the missing number: ? + 26 = 48
Answer: 22
💡 Missing number = 48 - 26 = 22; check: 26 + 22 = 48.
Q11418: What is the value of x if: x - 30 = 79
Answer: 109
💡 x = 79 + 30 = 109; check: 109 - 30 = 79.
Q11419: What is the missing number: ? + 91 = 198
Answer: 107
💡 Missing number = 198 - 91 = 107; check: 91 + 107 = 198.
Q11420: What is the value of x if: x - 27 = 100
Answer: 127
💡 x = 100 + 27 = 127; check: 127 - 27 = 100.
Q11421: What is the missing number: ? × 10 = 50
Answer: 5
💡 Missing number = 50 ÷ 10 = 5; check: 5 × 10 = 50.
Q11422: What is the missing number: 106 + ? = 144
Answer: 38
💡 Missing number = 144 - 106 = 38; check: 106 + 38 = 144.
Q11423: What is the value of x if: x - 53 = 188
Answer: 241
💡 x = 188 + 53 = 241; check: 241 - 53 = 188.
Q11424: What is the missing number: ? + 161 = 226
Answer: 65
💡 Missing number = 226 - 161 = 65; check: 161 + 65 = 226.
Q11425: What is the missing number: 121 + ? = 282
Answer: 161
💡 Missing number = 282 - 121 = 161; check: 121 + 161 = 282.
Q11426: What is the missing number: 130 + ? = 271
Answer: 141
💡 Missing number = 271 - 130 = 141; check: 130 + 141 = 271.
Q11427: What is the missing number: ? + 126 = 160
Answer: 34
💡 Missing number = 160 - 126 = 34; check: 126 + 34 = 160.
Q11428: What is the missing number: ? + 100 = 236
Answer: 136
💡 Missing number = 236 - 100 = 136; check: 100 + 136 = 236.
Q11429: What is the missing number: 4 + ? = 175
Answer: 171
💡 Missing number = 175 - 4 = 171; check: 4 + 171 = 175.
Q11430: What is the missing number: ? + 168 = 222
Answer: 54
💡 Missing number = 222 - 168 = 54; check: 168 + 54 = 222.
Q11431: What is the missing number: 88 + ? = 251
Answer: 163
💡 Missing number = 251 - 88 = 163; check: 88 + 163 = 251.
Q11432: What is the missing number: ? + 109 = 161
Answer: 52
💡 Missing number = 161 - 109 = 52; check: 109 + 52 = 161.
Q11433: What is the value of x if: x - 29 = 120
Answer: 149
💡 x = 120 + 29 = 149; check: 149 - 29 = 120.
Q11434: What is the value of x if: x - 54 = 34
Answer: 88
💡 x = 34 + 54 = 88; check: 88 - 54 = 34.
Q11435: What is the value of x if: x - 51 = 70
Answer: 121
💡 x = 70 + 51 = 121; check: 121 - 51 = 70.
Q11436: What is the missing number: ? + 61 = 107
Answer: 46
💡 Missing number = 107 - 61 = 46; check: 61 + 46 = 107.
Q11437: What is the missing number: ? + 153 = 268
Answer: 115
💡 Missing number = 268 - 153 = 115; check: 153 + 115 = 268.
Q11438: What is the missing number: ? + 109 = 115
Answer: 6
💡 Missing number = 115 - 109 = 6; check: 109 + 6 = 115.
Q11439: What is the value of x if: x - 18 = 26
Answer: 44
💡 x = 26 + 18 = 44; check: 44 - 18 = 26.
Q11440: What is the missing number: 102 + ? = 204
Answer: 102
💡 Missing number = 204 - 102 = 102; check: 102 + 102 = 204.
Q11441: What is the missing number: 178 + ? = 220
Answer: 42
💡 Missing number = 220 - 178 = 42; check: 178 + 42 = 220.
Q11442: What is the missing number: ? + 120 = 170
Answer: 50
💡 Missing number = 170 - 120 = 50; check: 120 + 50 = 170.
Q11443: What is the missing number: ? + 94 = 125
Answer: 31
💡 Missing number = 125 - 94 = 31; check: 94 + 31 = 125.
Q11444: What is the missing number: 23 + ? = 41
Answer: 18
💡 Missing number = 41 - 23 = 18; check: 23 + 18 = 41.
Q11445: What is the value of x if: x - 213 = 24
Answer: 237
💡 x = 24 + 213 = 237; check: 237 - 213 = 24.
Q11446: What is the missing number: 159 + ? = 272
Answer: 113
💡 Missing number = 272 - 159 = 113; check: 159 + 113 = 272.
Q11447: What is the missing number: ? + 83 = 146
Answer: 63
💡 Missing number = 146 - 83 = 63; check: 83 + 63 = 146.
Q11448: What is the value of x if: x - 2 = 54
Answer: 56
💡 x = 54 + 2 = 56; check: 56 - 2 = 54.
Q11449: What is the missing number: ? + 67 = 118
Answer: 51
💡 Missing number = 118 - 67 = 51; check: 67 + 51 = 118.
Q11450: What is the missing number: ? + 133 = 190
Answer: 57
💡 Missing number = 190 - 133 = 57; check: 133 + 57 = 190.
Q11451: What is the missing number: ? + 95 = 110
Answer: 15
💡 Missing number = 110 - 95 = 15; check: 95 + 15 = 110.
Q11452: What is the missing number: 55 + ? = 116
Answer: 61
💡 Missing number = 116 - 55 = 61; check: 55 + 61 = 116.
Q11453: What is the value of x if: x - 186 = 72
Answer: 258
💡 x = 72 + 186 = 258; check: 258 - 186 = 72.
Q11454: What is the value of x if: x - 26 = 14
Answer: 40
💡 x = 14 + 26 = 40; check: 40 - 26 = 14.
Q11455: What is the value of x if: x - 229 = 55
Answer: 284
💡 x = 55 + 229 = 284; check: 284 - 229 = 55.
Q11456: What is the value of x if: x - 102 = 77
Answer: 179
💡 x = 77 + 102 = 179; check: 179 - 102 = 77.
Q11457: What is the missing number: ? × 9 = 54
Answer: 6
💡 Missing number = 54 ÷ 9 = 6; check: 6 × 9 = 54.
Q11458: What is the value of x if: x - 40 = 23
Answer: 63
💡 x = 23 + 40 = 63; check: 63 - 40 = 23.
Q11459: What is the missing number: 75 + ? = 173
Answer: 98
💡 Missing number = 173 - 75 = 98; check: 75 + 98 = 173.
Q11460: What is the missing number: ? + 75 = 182
Answer: 107
💡 Missing number = 182 - 75 = 107; check: 75 + 107 = 182.
Q11461: What is the missing number: ? + 98 = 197
Answer: 99
💡 Missing number = 197 - 98 = 99; check: 98 + 99 = 197.
Q11462: What is the missing number: ? + 107 = 217
Answer: 110
💡 Missing number = 217 - 107 = 110; check: 107 + 110 = 217.
Q11463: What is the missing number: ? + 62 = 241
Answer: 179
💡 Missing number = 241 - 62 = 179; check: 62 + 179 = 241.
Q11464: What is the value of x if: x - 6 = 38
Answer: 44
💡 x = 38 + 6 = 44; check: 44 - 6 = 38.
Q11465: What is the missing number: ? + 147 = 242
Answer: 95
💡 Missing number = 242 - 147 = 95; check: 147 + 95 = 242.
Q11466: What is the missing number: 22 + ? = 196
Answer: 174
💡 Missing number = 196 - 22 = 174; check: 22 + 174 = 196.
Q11467: What is the value of x if: x - 7 = 246
Answer: 253
💡 x = 246 + 7 = 253; check: 253 - 7 = 246.
Q11468: What is the missing number: ? + 59 = 99
Answer: 40
💡 Missing number = 99 - 59 = 40; check: 59 + 40 = 99.
Q11469: What is the value of x if: x - 149 = 6
Answer: 155
💡 x = 6 + 149 = 155; check: 155 - 149 = 6.
Q11470: What is the missing number: 70 + ? = 137
Answer: 67
💡 Missing number = 137 - 70 = 67; check: 70 + 67 = 137.
Q11471: What is the missing number: 31 + ? = 138
Answer: 107
💡 Missing number = 138 - 31 = 107; check: 31 + 107 = 138.
Q11472: What is the missing number: ? × 12 = 84
Answer: 7
💡 Missing number = 84 ÷ 12 = 7; check: 7 × 12 = 84.
Q11473: What is the missing number: ? + 178 = 278
Answer: 100
💡 Missing number = 278 - 178 = 100; check: 178 + 100 = 278.
Q11474: What is the value of x if: x - 20 = 235
Answer: 255
💡 x = 235 + 20 = 255; check: 255 - 20 = 235.
Q11475: What is the missing number: ? + 100 = 120
Answer: 20
💡 Missing number = 120 - 100 = 20; check: 100 + 20 = 120.
Q11476: What is the missing number: 178 + ? = 337
Answer: 159
💡 Missing number = 337 - 178 = 159; check: 178 + 159 = 337.
Q11477: What is the missing number: ? × 7 = 28
Answer: 4
💡 Missing number = 28 ÷ 7 = 4; check: 4 × 7 = 28.
Q11478: What is the missing number: ? + 148 = 323
Answer: 175
💡 Missing number = 323 - 148 = 175; check: 148 + 175 = 323.
Q11479: What is the missing number: 117 + ? = 183
Answer: 66
💡 Missing number = 183 - 117 = 66; check: 117 + 66 = 183.
Q11480: What is the missing number: 40 + ? = 101
Answer: 61
💡 Missing number = 101 - 40 = 61; check: 40 + 61 = 101.
Q11481: What is the missing number: 168 + ? = 188
Answer: 20
💡 Missing number = 188 - 168 = 20; check: 168 + 20 = 188.
Q11482: What is the value of x if: x - 180 = 29
Answer: 209
💡 x = 29 + 180 = 209; check: 209 - 180 = 29.
Q11483: What is the value of x if: x - 16 = 49
Answer: 65
💡 x = 49 + 16 = 65; check: 65 - 16 = 49.
Q11484: What is the missing number: 105 + ? = 122
Answer: 17
💡 Missing number = 122 - 105 = 17; check: 105 + 17 = 122.
Q11485: What is the value of x if: x - 82 = 73
Answer: 155
💡 x = 73 + 82 = 155; check: 155 - 82 = 73.
Q11486: What is the value of x if: x - 35 = 230
Answer: 265
💡 x = 230 + 35 = 265; check: 265 - 35 = 230.
Q11487: What is the missing number: ? × 7 = 70
Answer: 10
💡 Missing number = 70 ÷ 7 = 10; check: 10 × 7 = 70.
Q11488: What is the missing number: 21 + ? = 90
Answer: 69
💡 Missing number = 90 - 21 = 69; check: 21 + 69 = 90.
Q11489: What is the value of x if: x - 22 = 86
Answer: 108
💡 x = 86 + 22 = 108; check: 108 - 22 = 86.
Q11490: What is the missing number: ? + 84 = 195
Answer: 111
💡 Missing number = 195 - 84 = 111; check: 84 + 111 = 195.
Q11491: What is the missing number: 109 + ? = 145
Answer: 36
💡 Missing number = 145 - 109 = 36; check: 109 + 36 = 145.
Q11492: What is the value of x if: x - 54 = 68
Answer: 122
💡 x = 68 + 54 = 122; check: 122 - 54 = 68.
Q11493: What is the missing number: ? + 14 = 22
Answer: 8
💡 Missing number = 22 - 14 = 8; check: 14 + 8 = 22.
Q11494: What is the missing number: 119 + ? = 285
Answer: 166
💡 Missing number = 285 - 119 = 166; check: 119 + 166 = 285.
Q11495: What is the missing number: ? + 54 = 186
Answer: 132
💡 Missing number = 186 - 54 = 132; check: 54 + 132 = 186.
Q11496: What is the value of x if: x - 54 = 19
Answer: 73
💡 x = 19 + 54 = 73; check: 73 - 54 = 19.
Q11497: What is the missing number: 2 + ? = 30
Answer: 28
💡 Missing number = 30 - 2 = 28; check: 2 + 28 = 30.
Q11498: What is the missing number: 6 + ? = 173
Answer: 167
💡 Missing number = 173 - 6 = 167; check: 6 + 167 = 173.
Q11499: What is the missing number: 13 + ? = 121
Answer: 108
💡 Missing number = 121 - 13 = 108; check: 13 + 108 = 121.
Q11500: What is the value of x if: x - 11 = 17
Answer: 28
💡 x = 17 + 11 = 28; check: 28 - 11 = 17.