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