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Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 49

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 49
Name:Date:Score:    / 16

Write prime or composite.

  1. 33 — prime or composite?
  2. 64 — prime or composite?
  3. 44 — prime or composite?
  4. 46 — prime or composite?
  5. 86 — prime or composite?
  6. 73 — prime or composite?
  7. 75 — prime or composite?
  8. 34 — prime or composite?
  9. 100 — prime or composite?
  10. 65 — prime or composite?
  11. 7 — prime or composite?
  12. 26 — prime or composite?
  13. 58 — prime or composite?
  14. 45 — prime or composite?
  15. 19 — prime or composite?
  16. 13 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 49
Name:Date:Score:    / 6

Write the prime numbers.

  1. Write the prime numbers between 40 and 50.
  2. Write the prime numbers between 70 and 80.
  3. Write the prime numbers between 50 and 60.
  4. Write the prime numbers between 20 and 30.
  5. Write the prime numbers between 90 and 100.
  6. Write the prime numbers between 80 and 90.

Prime factorisation

Class 6 · Worksheet 3 · set 49
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 124
  2. Prime factorisation of 160
  3. Prime factorisation of 186
  4. Prime factorisation of 138
  5. Prime factorisation of 42
  6. Prime factorisation of 153
  7. Prime factorisation of 174
  8. Prime factorisation of 162
  9. Prime factorisation of 78
  10. Prime factorisation of 45

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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.