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Grade 4 Prime & Composite Worksheet (Set E)

Free printable Grade 4 prime & composite worksheet with an answer key, prime and composite numbers. Print as a PDF for the classroom or home.

✓ Answer key checked by math, never wrong
Name
Date
Math · Grade 4

Prime or Composite

Write whether each number is prime or composite.

  1. 1.
    Is 21 prime or composite?
  2. 2.
    Is 59 prime or composite?
  3. 3.
    Is 51 prime or composite?
  4. 4.
    Is 33 prime or composite?
  5. 5.
    Is 10 prime or composite?
  6. 6.
    Is 54 prime or composite?
  7. 7.
    Is 4 prime or composite?
  8. 8.
    Is 18 prime or composite?
  9. 9.
    Is 31 prime or composite?
  10. 10.
    Is 15 prime or composite?
  11. 11.
    Is 20 prime or composite?
  12. 12.
    Is 26 prime or composite?
  13. 13.
    Is 10 prime or composite?
  14. 14.
    Is 52 prime or composite?
  15. 15.
    Is 5 prime or composite?
  16. 16.
    Is 56 prime or composite?
  17. 17.
    Is 27 prime or composite?
  18. 18.
    Is 43 prime or composite?
  19. 19.
    Is 26 prime or composite?
  20. 20.
    Is 42 prime or composite?
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