Math · Fourth Grade, Primary · Unit 5: Multiplying by a One-Digit Number · First Semester
A 10-question quiz; after every question you'll see the right answer with an explanation.
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In this lesson we learn to multiply a one-digit number by 10, 100, 1,000 and their multiples mentally using basic facts and patterns. For example, since 4 × 3 = 12, then 4 × 300 = 1,200.
💡 Tip: Watch out when the basic fact ends in zero: in 5 × 400, 5 × 4 = 20, then add two zeros to get 2,000, which has three zeros, not two.
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I multiply the basic fact 6 × 3 = 18, then add the number of zeros in 3,000, which is three, so the product is 18,000.
Because multiplying by 10 moves every digit one place to the left, so the ones become tens and a zero is written in the ones place, like 7 × 10 = 70.
Start the lesson quiz on Study with Ghada: 10 questions from the Math Fourth Grade, Primary question bank. After each answer you'll see the right answer with an explanation, and any questions you miss move to “Review my mistakes” until you master them.
Yes, completely free. They're built on the Math - Grade 4 - Semester 1 lessons in the same order as the book, and every question is reviewed and approved by a teacher before students see it.
