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Prime or Composite? is a free printable Grade 4 maths worksheet on classifying by factor count, aligned to Common Core standard 4.OA.B.4. It prints 12 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 12 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Prime or Composite?

4.OA.B.4

NameDate

Write prime or composite.

1.Is 31 prime or composite?
2.Is 5 prime or composite?
3.Is 59 prime or composite?
4.Is 52 prime or composite?
5.Is 40 prime or composite?
6.Is 14 prime or composite?
7.Is 53 prime or composite?
8.Is 39 prime or composite?
9.Is 2 prime or composite?
10.Is 58 prime or composite?
11.Is 13 prime or composite?
12.Is 51 prime or composite?

LessonPrint · 4.OA.B.4 · Set 12 · free to copy for classroom use

Answer key — Prime or Composite?

Set 12. Prints on its own sheet.

  1. 1.prime
  2. 2.prime
  3. 3.prime
  4. 4.composite
  5. 5.composite
  6. 6.composite
  7. 7.prime
  8. 8.composite
  9. 9.prime
  10. 10.composite
  11. 11.prime
  12. 12.composite

Last reviewed 2026-09-05. Aligned to 4.OA.B.4 of the Common Core State Standards for mathematics.