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

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 3
Name:Date:Score:    / 16

Write prime or composite.

  1. 70 — prime or composite?
  2. 67 — prime or composite?
  3. 87 — prime or composite?
  4. 79 — prime or composite?
  5. 73 — prime or composite?
  6. 44 — prime or composite?
  7. 43 — prime or composite?
  8. 86 — prime or composite?
  9. 48 — prime or composite?
  10. 19 — prime or composite?
  11. 76 — prime or composite?
  12. 38 — prime or composite?
  13. 36 — prime or composite?
  14. 15 — prime or composite?
  15. 71 — prime or composite?
  16. 100 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 3
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 70 and 80.
  2. Write the prime numbers between 10 and 20.
  3. Write the prime numbers between 0 and 10.
  4. Write the prime numbers between 20 and 30.
  5. Write the prime numbers between 60 and 70.
  6. Write the prime numbers between 30 and 40.

Prime factorisation

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

Write as a product of prime numbers.

  1. Prime factorisation of 81
  2. Prime factorisation of 140
  3. Prime factorisation of 48
  4. Prime factorisation of 45
  5. Prime factorisation of 78
  6. Prime factorisation of 56
  7. Prime factorisation of 174
  8. Prime factorisation of 160
  9. Prime factorisation of 164
  10. Prime factorisation of 96

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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.

How do I get different questions?

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

How do I print only one worksheet?

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.