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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 26

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 26
Name:Date:Score:    / 16

Write prime or composite.

  1. 49 — prime or composite?
  2. 6 — prime or composite?
  3. 20 — prime or composite?
  4. 57 — prime or composite?
  5. 98 — prime or composite?
  6. 73 — prime or composite?
  7. 48 — prime or composite?
  8. 40 — prime or composite?
  9. 90 — prime or composite?
  10. 54 — prime or composite?
  11. 85 — prime or composite?
  12. 50 — prime or composite?
  13. 100 — prime or composite?
  14. 31 — prime or composite?
  15. 14 — prime or composite?
  16. 9 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 26
Name:Date:Score:    / 6

Write the prime numbers.

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

Prime factorisation

Class 6 · Worksheet 3 · set 26
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 78
  2. Prime factorisation of 64
  3. Prime factorisation of 114
  4. Prime factorisation of 120
  5. Prime factorisation of 168
  6. Prime factorisation of 175
  7. Prime factorisation of 30
  8. Prime factorisation of 154
  9. Prime factorisation of 164
  10. Prime factorisation of 160

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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.