Explain why a number is prime or composite practice check

Q: What will my child learn in "Explain why a number is prime or composite"?

A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself. This 5th Grade Math lesson builds the skill Find factors and use divisibility rules with a concept card and practice.

Q: What grade level is "Explain why a number is prime or composite" for?

"Explain why a number is prime or composite" is a 5th Grade Math lesson in the Factors and multiples unit, designed for students around ages 10-11.

Q: How many practice questions are in this lesson?

This lesson includes 36 practice questions with instant feedback. Guests can try a few for free, and signed-in learners get the full adaptive set that adjusts to their level.

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Sparq is a safe AI tutor that gives kid-friendly hints and explains Explain why a number is prime or composite step by step, helping students learn without just giving away the answer.

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Question 1

The diagram shows 7 stars. Since the only factors are 1 and 7, is 7 prime or composite?

Accepted Answer

Prime

Answer

Composite

Question 2

The diagram shows 8 balls arranged in 2 groups of 4. Since 8 has factors 1, 2, 4, and 8, is 8 prime or composite?

Accepted Answer

Composite

Answer

Prime

Question 3

Explain why 21 is composite.

Accepted Answer

21 is composite because it has factors 1, 3, 7, and 21.

Explain why a number is prime or composite

Prime Numbers