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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 79

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 79
Name:Date:Score:    / 16

Write prime or composite.

  1. 29 — prime or composite?
  2. 19 — prime or composite?
  3. 72 — prime or composite?
  4. 84 — prime or composite?
  5. 62 — prime or composite?
  6. 16 — prime or composite?
  7. 65 — prime or composite?
  8. 92 — prime or composite?
  9. 71 — prime or composite?
  10. 30 — prime or composite?
  11. 83 — prime or composite?
  12. 87 — prime or composite?
  13. 47 — prime or composite?
  14. 89 — prime or composite?
  15. 39 — prime or composite?
  16. 82 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 79
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 30 and 40.
  2. Write the prime numbers between 70 and 80.
  3. Write the prime numbers between 20 and 30.
  4. Write the prime numbers between 40 and 50.
  5. Write the prime numbers between 0 and 10.
  6. Write the prime numbers between 10 and 20.

Prime factorisation

Class 6 · Worksheet 3 · set 79
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 120
  2. Prime factorisation of 81
  3. Prime factorisation of 196
  4. Prime factorisation of 98
  5. Prime factorisation of 90
  6. Prime factorisation of 147
  7. Prime factorisation of 125
  8. Prime factorisation of 105
  9. Prime factorisation of 108
  10. Prime factorisation of 176

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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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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.