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Celeste International School

Grade 5 · Worksheet

Numbers and sequences

Common multiples & factors

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

    Which of these is a multiple of 3?

    1. A12
    2. B14
    3. C20
    4. D22
  2. 2.

    Which of these is a factor of 12?

    1. A4
    2. B5
    3. C7
    4. D8
  3. 3.

    24 is a common multiple of 3 and 8.

    True False
  4. 4.

    Anna's number is a multiple of 3 and 5 and is less than 20. What is her number?

  5. 5.

    Which number is a common multiple of 3 and 5?

    1. A15
    2. B10
    3. C12
    4. D9
  6. 6.

    Write the smallest number bigger than 100 that is a multiple of both 3 and 5.

  7. 7.

    Put these multiples of 8 in order from smallest to largest.

    Write the order (smallest to largest) in the boxes:

    • ?24
    • ?8
    • ?40
    • ?16
  8. 8.

    Write the largest common multiple of 3 and 8 that is less than 50.

  9. 9.

    Which are the common multiples of 3 and 8 that are less than 50?

    1. A24 and 48
    2. B16 and 32
    3. C8 and 24
    4. D12 and 48
  10. 10.

    30 is a common multiple of 2, 3 and 5.

    True False
  11. 11.

    From 5, 14, 15, 18, 20, 21, 24, 29, 30, 60, which are the common multiples of 2, 3 and 5?

    1. A30 and 60
    2. B15 and 30
    3. C20 and 60
    4. D24 and 30
  12. 12.

    How many factors does 18 have? Count them all.

  13. 13.

    Which of these is NOT a factor of 24?

    1. A5
    2. B6
    3. C8
    4. D12
  14. 14.

    What is the largest factor of 18 that is not 18 itself?

  15. 15.

    Put the factors of 12 in order from smallest to largest.

    Write the order (smallest to largest) in the boxes:

    • ?3
    • ?1
    • ?12
    • ?2
    • ?6
    • ?4
  16. 16.

    Which numbers are the common factors of 18 and 24?

    1. A1, 2, 3, 6
    2. B1, 2, 4, 8
    3. C2, 3, 6, 9
    4. D1, 3, 6, 9
  17. 17.

    How many common factors do 18 and 24 have?

  18. 18.

    Which numbers are factors of both 30 and 20?

    1. A1, 2, 5, 10
    2. B1, 2, 3, 5
    3. C2, 4, 5, 10
    4. D1, 5, 10, 15
  19. 19.

    10 is a common factor of 30 and 20.

    True False
  20. 20.

    4 is a common factor of 30 and 20.

    True False
Celeste International School

Answer key

Numbers and sequences — Common multiples & factors

  1. 1.A. 12
  2. 2.A. 4
  3. 3.True
  4. 4.15
  5. 5.A. 15
  6. 6.105
  7. 7.8, 16, 24, 40
  8. 8.48
  9. 9.A. 24 and 48
  10. 10.True
  11. 11.A. 30 and 60
  12. 12.6
  13. 13.A. 5
  14. 14.9
  15. 15.1, 2, 3, 4, 6, 12
  16. 16.A. 1, 2, 3, 6
  17. 17.4
  18. 18.A. 1, 2, 5, 10
  19. 19.True
  20. 20.False