Lesson ⁦3-6⁩: Probability

Math · Fourth Grade, Primary · Unit 3: Organizing, Displaying, and Interpreting Data · First Semester

A 10-question quiz; after every question you'll see the right answer with an explanation.
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What will you learn in this lesson?

In this lesson we learn about probability, the chance that an event will happen, and describe it with words such as certain, impossible, likely, and equally likely. We use it with bags, number cubes, and spinners.

  • Describes the probability of an event in words: certain, possible, impossible
  • Compares the probabilities of two events: more likely, less likely, equally likely
  • Identifies the possible outcomes of a simple experiment
  • Solves problems involving bags, number cubes, and spinners

💡 Tip: Compare the number of balls or sections of each color: the color with more is more likely, equal numbers mean an equal chance, and if the color isn't there at all, the event is impossible.

🤖 Ask Ghada about the lesson

Ghada explains the lesson and answers your questions about it. Log in to get started.

Worked examples from the Probability lesson questions

A bag has 10 balls, all of them red. A ball is drawn without looking. How would you describe the probability that it is red?
  • Certain
  • Impossible
  • Less likely
  • Equally likely
✓ Certain
All the balls are red, so drawing a red ball will definitely happen.
A bag has 10 balls, all of them red. A ball is drawn without looking. How would you describe the probability that it is blue?
  • Impossible
  • Certain
  • More likely
  • Equally likely
✓ Impossible
There are no blue balls in the bag, so drawing a blue ball cannot happen.
Show more examples (3)
When rolling a number cube with the numbers 1 to 6, how would you describe the probability of getting 7?
  • Impossible
  • Certain
  • Possible
  • More likely
✓ Impossible
There is no 7 on the cube, so getting it is impossible.
Which word describes an event that will definitely happen?
  • Certain
  • Impossible
  • Possible
  • Less likely
✓ Certain
A certain event is one that will surely happen.
A bag has 7 green balls and 2 yellow balls. Which statement describes drawing a green ball without looking?
  • More likely than drawing a yellow ball
  • Less likely than drawing a yellow ball
  • Impossible
  • Equally likely as drawing a yellow ball
✓ More likely than drawing a yellow ball
The number of green balls (7) is greater than the number of yellow balls (2), so drawing green is more likely.

FAQ about the Probability lesson

What is the difference between a certain event and an impossible event?

A certain event always happens, like drawing a red ball from a bag where all the balls are red, and an impossible event never happens, like rolling a 7 on a number cube numbered 1 to 6.

When do two events have the same chance?

When they have the same number of outcomes, like a spinner divided into 4 equal parts with two red and two blue parts: the chance of red equals the chance of blue.

How do I study the lesson Probability and test myself on it?

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.

Are Study with Ghada quizzes free and aligned with the curriculum?

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.