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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 85

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 85
Name:Date:Score:    / 16

Write prime or composite.

  1. 11 — prime or composite?
  2. 50 — prime or composite?
  3. 94 — prime or composite?
  4. 82 — prime or composite?
  5. 47 — prime or composite?
  6. 26 — prime or composite?
  7. 14 — prime or composite?
  8. 64 — prime or composite?
  9. 87 — prime or composite?
  10. 5 — prime or composite?
  11. 4 — prime or composite?
  12. 79 — prime or composite?
  13. 36 — prime or composite?
  14. 34 — prime or composite?
  15. 16 — prime or composite?
  16. 86 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 85
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 30 and 40.
  2. Write the prime numbers between 90 and 100.
  3. Write the prime numbers between 50 and 60.
  4. Write the prime numbers between 60 and 70.
  5. Write the prime numbers between 20 and 30.
  6. Write the prime numbers between 10 and 20.

Prime factorisation

Class 6 · Worksheet 3 · set 85
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 102
  2. Prime factorisation of 132
  3. Prime factorisation of 48
  4. Prime factorisation of 168
  5. Prime factorisation of 196
  6. Prime factorisation of 130
  7. Prime factorisation of 50
  8. Prime factorisation of 154
  9. Prime factorisation of 117
  10. Prime factorisation of 36

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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.