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Prime & Composite Worksheet

Recommended for 4th Grade — 6th Grade

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Prime & Composite Worksheet

Name: ____________________Date: ____________

Instructions: Identifying prime and composite numbers and writing prime factorizations.

20 problems

  1. Prime numbers in {5, 13, 19, 15, 9, 27} → ______
  2. Prime numbers in {12, 7, 25, 13, 23, 21} → ______
  3. Prime numbers in {23, 9, 25, 7, 8, 29} → ______
  4. Prime numbers in {9, 15, 7, 29, 3, 12} → ______
  5. Prime numbers in {11, 13, 21, 8, 25, 7} → ______
  6. Prime numbers in {13, 7, 5, 2, 21, 27} → ______
  7. Prime numbers in {29, 15, 19, 2, 21, 3} → ______
  8. Prime numbers in {15, 3, 27, 17, 25, 23} → ______
  9. Prime numbers in {12, 7, 15, 27, 23, 8} → ______
  10. Prime numbers in {5, 12, 11, 15, 25, 19} → ______
  11. Prime numbers in {25, 15, 7, 19, 2, 3} → ______
  12. Prime numbers in {17, 29, 13, 3, 5, 19} → ______
  13. Prime numbers in {3, 19, 23, 2, 25, 29} → ______
  14. Prime numbers in {29, 23, 15, 8, 7, 13} → ______
  15. Prime numbers in {13, 11, 21, 12, 9, 27} → ______
  16. Prime numbers in {13, 9, 29, 17, 19, 7} → ______
  17. Prime numbers in {25, 29, 12, 23, 9, 27} → ______
  18. Prime numbers in {11, 19, 17, 2, 3, 12} → ______
  19. Prime numbers in {7, 13, 2, 3, 15, 12} → ______
  20. Prime numbers in {17, 12, 2, 21, 27, 13} → ______