Worksheet

Prime and Composite Numbers

Grade 4 - Math - Building Confidence

NameDate

  1. What kind of number is 6: prime or composite?

    • neither prime nor composite
    • prime
    • composite
    • both prime and composite

  2. Which number is prime?

    • 4
    • 2
    • 24
    • 21

  3. Which number is composite?

    • 3
    • 10
    • 19
    • 13

  4. Which best explains why 19 is prime?

    • It has factors other than 1 and itself.
    • It has no factors at all.
    • Its only factors are 1 and itself.
    • It is a composite number.

  5. 12 is composite. Which number is a factor of 12, besides 1 and 12?

    • 7
    • 14
    • 18
    • 4

  6. What kind of number is 17: prime or composite?

    • neither prime nor composite
    • prime
    • both prime and composite
    • composite

  7. Which number is prime?

    • 5
    • 10
    • 4
    • 22

  8. Which number is composite?

    • 11
    • 4
    • 2
    • 3

  9. Which best explains why 8 is composite?

    • It has factors other than 1 and itself.
    • It has no factors at all.
    • Its only factors are 1 and itself.
    • It is a prime number.

  10. 15 is composite. Which number is a factor of 15, besides 1 and 15?

    • 2
    • 14
    • 8
    • 3
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