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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 18

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 18
Name:Date:Score:    / 16

Write prime or composite.

  1. 75 — prime or composite?
  2. 23 — prime or composite?
  3. 99 — prime or composite?
  4. 88 — prime or composite?
  5. 28 — prime or composite?
  6. 56 — prime or composite?
  7. 61 — prime or composite?
  8. 18 — prime or composite?
  9. 62 — prime or composite?
  10. 17 — prime or composite?
  11. 8 — prime or composite?
  12. 10 — prime or composite?
  13. 81 — prime or composite?
  14. 66 — prime or composite?
  15. 15 — prime or composite?
  16. 20 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 18
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 20 and 30.
  2. Write the prime numbers between 10 and 20.
  3. Write the prime numbers between 90 and 100.
  4. Write the prime numbers between 60 and 70.
  5. Write the prime numbers between 70 and 80.
  6. Write the prime numbers between 50 and 60.

Prime factorisation

Class 6 · Worksheet 3 · set 18
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 28
  2. Prime factorisation of 112
  3. Prime factorisation of 135
  4. Prime factorisation of 75
  5. Prime factorisation of 154
  6. Prime factorisation of 150
  7. Prime factorisation of 168
  8. Prime factorisation of 192
  9. Prime factorisation of 188
  10. Prime factorisation of 96

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.