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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 13

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 13
Name:Date:Score:    / 16

Write prime or composite.

  1. 80 — prime or composite?
  2. 38 — prime or composite?
  3. 24 — prime or composite?
  4. 46 — prime or composite?
  5. 18 — prime or composite?
  6. 82 — prime or composite?
  7. 20 — prime or composite?
  8. 41 — prime or composite?
  9. 69 — prime or composite?
  10. 37 — prime or composite?
  11. 30 — prime or composite?
  12. 17 — prime or composite?
  13. 52 — prime or composite?
  14. 78 — prime or composite?
  15. 67 — prime or composite?
  16. 56 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 13
Name:Date:Score:    / 6

Write the prime numbers.

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

Prime factorisation

Class 6 · Worksheet 3 · set 13
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 114
  2. Prime factorisation of 154
  3. Prime factorisation of 105
  4. Prime factorisation of 28
  5. Prime factorisation of 54
  6. Prime factorisation of 162
  7. Prime factorisation of 153
  8. Prime factorisation of 68
  9. Prime factorisation of 125
  10. Prime factorisation of 102

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.

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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.