← Back

Opens your browser’s print dialog — choose “Save as PDF” as the destination.

Celeste International School

Grade 4 · Worksheet

Numbers and sequences

Prime & composite numbers

Name: ______________________________Date: ______________Score: ______ / 20
  1. 1.

    Which of these is a prime number?

    1. A11
    2. B21
    3. C51
    4. D9
  2. 2.

    A number with more than two factors is called a…

    1. Acomposite number
    2. Bprime number
    3. Csquare number
    4. Dfactor
  3. 3.

    Which of these is a composite number?

    1. A15
    2. B13
    3. C17
    4. D19
  4. 4.

    7 is a prime number.

    True False
  5. 5.

    67 is a prime number.

    True False
  6. 6.

    98 is a prime number.

    True False
  7. 7.

    77 is a prime number.

    True False
  8. 8.

    79 is a prime number.

    True False
  9. 9.

    75 is a prime number.

    True False
  10. 10.

    62 is a prime number.

    True False
  11. 11.

    70 is a prime number.

    True False
  12. 12.

    80 is a prime number.

    True False
  13. 13.

    97 is a prime number.

    True False
  14. 14.

    88 is a prime number.

    True False
  15. 15.

    3 is a prime number.

    True False
  16. 16.

    18 is a prime number.

    True False
  17. 17.

    10 is a prime number.

    True False
  18. 18.

    39 is a prime number.

    True False
  19. 19.

    6 is a prime number.

    True False
  20. 20.

    Select all the prime numbers.

    • A11
    • B15
    • C23
    • D27
    • E31
    • F9
Celeste International School

Answer key

Numbers and sequences — Prime & composite numbers

  1. 1.A. 11
  2. 2.A. composite number
  3. 3.A. 15
  4. 4.True
  5. 5.True
  6. 6.False
  7. 7.False
  8. 8.True
  9. 9.False
  10. 10.False
  11. 11.False
  12. 12.False
  13. 13.True
  14. 14.False
  15. 15.True
  16. 16.False
  17. 17.False
  18. 18.False
  19. 19.False
  20. 20.A. 11; C. 23; E. 31