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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 39

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 39
Name:Date:Score:    / 16

Write prime or composite.

  1. 96 — prime or composite?
  2. 63 — prime or composite?
  3. 99 — prime or composite?
  4. 39 — prime or composite?
  5. 61 — prime or composite?
  6. 76 — prime or composite?
  7. 34 — prime or composite?
  8. 24 — prime or composite?
  9. 60 — prime or composite?
  10. 87 — prime or composite?
  11. 91 — prime or composite?
  12. 42 — prime or composite?
  13. 52 — prime or composite?
  14. 86 — prime or composite?
  15. 57 — prime or composite?
  16. 50 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 39
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 20 and 30.
  2. Write the prime numbers between 0 and 10.
  3. Write the prime numbers between 80 and 90.
  4. Write the prime numbers between 90 and 100.
  5. Write the prime numbers between 30 and 40.
  6. Write the prime numbers between 40 and 50.

Prime factorisation

Class 6 · Worksheet 3 · set 39
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 175
  2. Prime factorisation of 100
  3. Prime factorisation of 88
  4. Prime factorisation of 116
  5. Prime factorisation of 165
  6. Prime factorisation of 174
  7. Prime factorisation of 144
  8. Prime factorisation of 126
  9. Prime factorisation of 52
  10. Prime factorisation of 80

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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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Press “🔄 New set” — the questions change (maths numbers are new every time; English sentences are shuffled).

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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.