Grade 5 · Year 6 · Class 5 · ages 10–11
Prime and composite numbers worksheets.
Free printable prime and composite numbers worksheets with answer keys. Deciding whether a number is prime (only two factors) or composite. Choose the level and the number of questions, then download a PDF or print.
- Grade 5
- Year 6 · Class 5
- Ages 10–11
- PDF + print
- Answer key
- Free
Sheet 74602. Change the options above or make a new worksheet.
Prime and composite numbers
Grade 5 · Medium · 12 questions · Sheet 74602
Name Date Score / 12
- 1.Is 45 prime or composite?
- 2.Is 9 prime or composite?
- 3.Is 7 prime or composite?
- 4.Is 52 prime or composite?
- 5.Is 33 prime or composite?
- 6.Is 5 prime or composite?
- 7.Is 23 prime or composite?
- 8.Is 24 prime or composite?
- 9.Is 8 prime or composite?
- 10.Is 17 prime or composite?
- 11.Is 37 prime or composite?
- 12.Is 14 prime or composite?
About prime and composite numbers worksheets
Deciding whether a number is prime (only two factors) or composite. This worksheet maker is aimed at Grade 5 (Year 6, Class 5) (ages 10–11) and makes new questions every time, with the answers worked out by a maths engine.
Teaching tip
A prime number has exactly two factors: 1 and itself. Try dividing by 2, 3, 5 and 7 to look for a factor.
What the three levels look like
- Easy: Is 9 prime or composite? ___
- Medium: Is 13 prime or composite? ___
- Challenge: Is 61 prime or composite? ___
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FAQ
Prime and composite numbers worksheets: questions
What grade are prime and composite numbers worksheets for?
Prime and composite numbers is usually taught around Grade 5 (Year 6, Class 5), for ages 10–11. Every grade has an easy, medium and challenge level, so you can go back to an earlier level or push ahead.
Do these prime and composite numbers worksheets include an answer key?
Yes. Press Download PDF with the answer key switched on and the last page lists every answer. Turn the key off for a clean student copy.
Can I make a new worksheet with different questions?
Yes. Press New worksheet for a fresh set of questions. Each sheet has a sheet number printed on it; open this page with the same level, question count and number to get exactly the same sheet again.
How do I help a child who finds prime and composite numbers hard?
A prime number has exactly two factors: 1 and itself. Try dividing by 2, 3, 5 and 7 to look for a factor. Start with the easy level, and practise a few minutes every day rather than one long session.
Why is number sense important?
Children with good number sense estimate well, spot unreasonable answers and learn new topics faster because they understand why the rules work.
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Prime and composite numbers (Grade 5): Deciding whether a number is prime (only two factors) or composite. Open the practice page or print a worksheet.
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