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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 77

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 77
Name:Date:Score:    / 16

Write prime or composite.

  1. 38 — prime or composite?
  2. 50 — prime or composite?
  3. 21 — prime or composite?
  4. 78 — prime or composite?
  5. 12 — prime or composite?
  6. 2 — prime or composite?
  7. 80 — prime or composite?
  8. 68 — prime or composite?
  9. 45 — prime or composite?
  10. 46 — prime or composite?
  11. 81 — prime or composite?
  12. 18 — prime or composite?
  13. 28 — prime or composite?
  14. 70 — prime or composite?
  15. 92 — prime or composite?
  16. 84 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 77
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 60 and 70.
  2. Write the prime numbers between 10 and 20.
  3. Write the prime numbers between 0 and 10.
  4. Write the prime numbers between 70 and 80.
  5. Write the prime numbers between 90 and 100.
  6. Write the prime numbers between 40 and 50.

Prime factorisation

Class 6 · Worksheet 3 · set 77
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 68
  2. Prime factorisation of 182
  3. Prime factorisation of 63
  4. Prime factorisation of 20
  5. Prime factorisation of 125
  6. Prime factorisation of 144
  7. Prime factorisation of 70
  8. Prime factorisation of 152
  9. Prime factorisation of 160
  10. Prime factorisation of 200

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.

How do I get different questions?

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.