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