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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 69

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 69
Name:Date:Score:    / 16

Write prime or composite.

  1. 50 — prime or composite?
  2. 62 — prime or composite?
  3. 26 — prime or composite?
  4. 27 — prime or composite?
  5. 54 — prime or composite?
  6. 86 — prime or composite?
  7. 16 — prime or composite?
  8. 4 — prime or composite?
  9. 55 — prime or composite?
  10. 91 — prime or composite?
  11. 19 — prime or composite?
  12. 41 — prime or composite?
  13. 66 — prime or composite?
  14. 3 — prime or composite?
  15. 11 — prime or composite?
  16. 53 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 69
Name:Date:Score:    / 6

Write the prime numbers.

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

Prime factorisation

Class 6 · Worksheet 3 · set 69
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 100
  2. Prime factorisation of 189
  3. Prime factorisation of 60
  4. Prime factorisation of 42
  5. Prime factorisation of 148
  6. Prime factorisation of 50
  7. Prime factorisation of 165
  8. Prime factorisation of 110
  9. Prime factorisation of 140
  10. Prime factorisation of 117

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.

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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.