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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 80

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 80
Name:Date:Score:    / 16

Write prime or composite.

  1. 86 — prime or composite?
  2. 17 — prime or composite?
  3. 10 — prime or composite?
  4. 60 — prime or composite?
  5. 70 — prime or composite?
  6. 9 — prime or composite?
  7. 50 — prime or composite?
  8. 31 — prime or composite?
  9. 41 — prime or composite?
  10. 30 — prime or composite?
  11. 23 — prime or composite?
  12. 63 — prime or composite?
  13. 64 — prime or composite?
  14. 67 — prime or composite?
  15. 92 — prime or composite?
  16. 5 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 80
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 70 and 80.
  2. Write the prime numbers between 0 and 10.
  3. Write the prime numbers between 20 and 30.
  4. Write the prime numbers between 80 and 90.
  5. Write the prime numbers between 30 and 40.
  6. Write the prime numbers between 10 and 20.

Prime factorisation

Class 6 · Worksheet 3 · set 80
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 105
  2. Prime factorisation of 12
  3. Prime factorisation of 24
  4. Prime factorisation of 148
  5. Prime factorisation of 99
  6. Prime factorisation of 170
  7. Prime factorisation of 75
  8. Prime factorisation of 195
  9. Prime factorisation of 184
  10. Prime factorisation of 152

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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.