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