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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 21

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 21
Name:Date:Score:    / 16

Write prime or composite.

  1. 84 — prime or composite?
  2. 41 — prime or composite?
  3. 36 — prime or composite?
  4. 34 — prime or composite?
  5. 39 — prime or composite?
  6. 96 — prime or composite?
  7. 24 — prime or composite?
  8. 18 — prime or composite?
  9. 48 — prime or composite?
  10. 50 — prime or composite?
  11. 5 — prime or composite?
  12. 52 — prime or composite?
  13. 31 — prime or composite?
  14. 30 — prime or composite?
  15. 20 — prime or composite?
  16. 86 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 21
Name:Date:Score:    / 6

Write the prime numbers.

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

Prime factorisation

Class 6 · Worksheet 3 · set 21
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 126
  2. Prime factorisation of 136
  3. Prime factorisation of 36
  4. Prime factorisation of 45
  5. Prime factorisation of 76
  6. Prime factorisation of 40
  7. Prime factorisation of 54
  8. Prime factorisation of 80
  9. Prime factorisation of 165
  10. Prime factorisation of 108

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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Press “🖨️ Print” on that worksheet. Tick “with answer key” if you want the answers on a second page.

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.