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