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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 61

Prime and composite numbers worksheets

Free prime and composite numbers worksheets for Class 4 to 6: prime or composite, primes between two numbers and prime factorisation — with answers.

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Prime or composite? (Class 4–5)Primes between (Class 5)Prime factorisation (Class 6)

Prime or composite?

Class 4–5 · Worksheet 1 · set 61
Name:Date:Score:    / 16

Write prime or composite.

  1. 68 — prime or composite?
  2. 19 — prime or composite?
  3. 66 — prime or composite?
  4. 82 — prime or composite?
  5. 36 — prime or composite?
  6. 76 — prime or composite?
  7. 41 — prime or composite?
  8. 12 — prime or composite?
  9. 64 — prime or composite?
  10. 26 — prime or composite?
  11. 72 — prime or composite?
  12. 90 — prime or composite?
  13. 16 — prime or composite?
  14. 13 — prime or composite?
  15. 43 — prime or composite?
  16. 10 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 61
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 20 and 30.
  2. Write the prime numbers between 60 and 70.
  3. Write the prime numbers between 10 and 20.
  4. Write the prime numbers between 80 and 90.
  5. Write the prime numbers between 70 and 80.
  6. Write the prime numbers between 90 and 100.

Prime factorisation

Class 6 · Worksheet 3 · set 61
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 28
  2. Prime factorisation of 99
  3. Prime factorisation of 70
  4. Prime factorisation of 78
  5. Prime factorisation of 42
  6. Prime factorisation of 76
  7. Prime factorisation of 150
  8. Prime factorisation of 64
  9. Prime factorisation of 63
  10. Prime factorisation of 117

More worksheets

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Questions

How many prime numbers are there between 1 and 100?

25: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

Are these worksheets free?

Yes — print them or save as PDF free. Every worksheet has an answer key.

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Can my child do this worksheet online, like a quiz?

Yes — press “▶️ Practise online” on any worksheet. The questions come one at a time with instant marking, a score at the end and a review of mistakes. No sign-in is needed.