Apps

TalentJR apps

How the apps work →
Free · Class 4–6 · 3 worksheets · answer keys · practise online · set 81

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.

💡 Learn it first

🔢 The worksheets

🔄 New set of questions

Prime or composite? (Class 4–5)Primes between (Class 5)Prime factorisation (Class 6)

Prime or composite?

Class 4–5 · Worksheet 1 · set 81
Name:Date:Score:    / 16

Write prime or composite.

  1. 20 — prime or composite?
  2. 90 — prime or composite?
  3. 49 — prime or composite?
  4. 99 — prime or composite?
  5. 24 — prime or composite?
  6. 80 — prime or composite?
  7. 94 — prime or composite?
  8. 55 — prime or composite?
  9. 63 — prime or composite?
  10. 51 — prime or composite?
  11. 44 — prime or composite?
  12. 35 — prime or composite?
  13. 18 — prime or composite?
  14. 43 — prime or composite?
  15. 40 — prime or composite?
  16. 42 — prime or composite?

Primes between

Class 5 · Worksheet 2 · set 81
Name:Date:Score:    / 6

Write the prime numbers.

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

Prime factorisation

Class 6 · Worksheet 3 · set 81
Name:Date:Score:    / 10

Write as a product of prime numbers.

  1. Prime factorisation of 153
  2. Prime factorisation of 148
  3. Prime factorisation of 45
  4. Prime factorisation of 182
  5. Prime factorisation of 32
  6. Prime factorisation of 147
  7. Prime factorisation of 27
  8. Prime factorisation of 99
  9. Prime factorisation of 96
  10. Prime factorisation of 56

More worksheets

🔣 Factors and multiples🔢 Maths worksheets by class Noun worksheetsPronoun worksheetsArticles worksheetTenses worksheetPrepositions worksheetSubtraction worksheets All worksheets

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.

How do I get different questions?

Press “🔄 New set” — the questions change (maths numbers are new every time; English sentences are shuffled).

How do I print only one worksheet?

Press “🖨️ Print” on that worksheet. Tick “with answer key” if you want the answers on a second page.

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.