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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 37

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 37
Name:Date:Score:    / 16

Write prime or composite.

  1. 71 — prime or composite?
  2. 51 — prime or composite?
  3. 69 — prime or composite?
  4. 74 — prime or composite?
  5. 58 — prime or composite?
  6. 54 — prime or composite?
  7. 100 — prime or composite?
  8. 83 — prime or composite?
  9. 70 — prime or composite?
  10. 4 — prime or composite?
  11. 9 — prime or composite?
  12. 25 — prime or composite?
  13. 14 — prime or composite?
  14. 62 — prime or composite?
  15. 53 — prime or composite?
  16. 23 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 37
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 20 and 30.
  2. Write the prime numbers between 70 and 80.
  3. Write the prime numbers between 50 and 60.
  4. Write the prime numbers between 40 and 50.
  5. Write the prime numbers between 10 and 20.
  6. Write the prime numbers between 30 and 40.

Prime factorisation

Class 6 · Worksheet 3 · set 37
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 102
  2. Prime factorisation of 32
  3. Prime factorisation of 20
  4. Prime factorisation of 42
  5. Prime factorisation of 170
  6. Prime factorisation of 148
  7. Prime factorisation of 176
  8. Prime factorisation of 132
  9. Prime factorisation of 110
  10. Prime factorisation of 147

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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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.