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