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