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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 82

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 82
Name:Date:Score:    / 16

Write prime or composite.

  1. 100 — prime or composite?
  2. 54 — prime or composite?
  3. 34 — prime or composite?
  4. 36 — prime or composite?
  5. 6 — prime or composite?
  6. 57 — prime or composite?
  7. 82 — prime or composite?
  8. 86 — prime or composite?
  9. 19 — prime or composite?
  10. 28 — prime or composite?
  11. 70 — prime or composite?
  12. 13 — prime or composite?
  13. 77 — prime or composite?
  14. 53 — prime or composite?
  15. 50 — prime or composite?
  16. 72 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 82
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 90 and 100.
  2. Write the prime numbers between 50 and 60.
  3. Write the prime numbers between 30 and 40.
  4. Write the prime numbers between 20 and 30.
  5. Write the prime numbers between 80 and 90.
  6. Write the prime numbers between 0 and 10.

Prime factorisation

Class 6 · Worksheet 3 · set 82
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 171
  2. Prime factorisation of 170
  3. Prime factorisation of 165
  4. Prime factorisation of 90
  5. Prime factorisation of 102
  6. Prime factorisation of 182
  7. Prime factorisation of 98
  8. Prime factorisation of 180
  9. Prime factorisation of 63
  10. Prime factorisation of 72

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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.

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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.