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