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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 31

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 31
Name:Date:Score:    / 16

Write prime or composite.

  1. 73 — prime or composite?
  2. 32 — prime or composite?
  3. 35 — prime or composite?
  4. 45 — prime or composite?
  5. 51 — prime or composite?
  6. 6 — prime or composite?
  7. 33 — prime or composite?
  8. 100 — prime or composite?
  9. 84 — prime or composite?
  10. 72 — prime or composite?
  11. 71 — prime or composite?
  12. 92 — prime or composite?
  13. 75 — prime or composite?
  14. 61 — prime or composite?
  15. 50 — prime or composite?
  16. 87 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 31
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 50 and 60.
  2. Write the prime numbers between 80 and 90.
  3. Write the prime numbers between 60 and 70.
  4. Write the prime numbers between 20 and 30.
  5. Write the prime numbers between 10 and 20.
  6. Write the prime numbers between 0 and 10.

Prime factorisation

Class 6 · Worksheet 3 · set 31
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 152
  2. Prime factorisation of 76
  3. Prime factorisation of 130
  4. Prime factorisation of 148
  5. Prime factorisation of 96
  6. Prime factorisation of 135
  7. Prime factorisation of 24
  8. Prime factorisation of 84
  9. Prime factorisation of 100
  10. Prime factorisation of 50

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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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.