Prime and Composite Worksheets
Decide whether each number is prime (exactly two factors) or composite (more than two).
- Free, no sign-up
- No AI — answers are calculated, not guessed
- Made in your browser, nothing uploaded
Example worksheets
Made with this tool — click any example to see it full size.
Best for: Grades 4–5
Prime or composite?
A prime number has exactly two factors: 1 and itself. Composite numbers have more. The number 1 is neither, so it never appears on these sheets.
Make it a timed challenge
Put a visual classroom timer on the board and see how many problems students can finish before the time runs out. Print a new version tomorrow and try to beat the score.
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Frequently asked questions
What range of numbers is used?
Choose the smallest and largest numbers; 2 to 100 is typical.
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