Greatest Common Factor

Mr. Forbes

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Find the Greatest Common Factor for each of the following pair of numbers. Answer the questions below with the best possible answer from the list and then click "submit" to send your answers.

  1. 12, 8
  2. Your answer:
    2
    4
    8
    none of the answers provided


  3. 45, 15
  4. Your answer:
    30
    none of the answers provided
    5
    15


  5. 30, 24
  6. Your answer:
    2
    4
    none of the answers provided
    3


  7. 8, 36
  8. Your answer:
    2
    none of the answers provided
    8
    4


  9. 18, 48
  10. Your answer:
    6
    none of the answers provided
    2
    8


  11. 15, 55
  12. Your answer:
    11
    none of the answers provided
    15
    5


  13. 40, 80
  14. Your answer:
    10
    none of the answers provided
    40
    20


  15. 17, 51
  16. Your answer:
    3
    1
    none of the answers provided
    zero


  17. 19, 21
  18. Your answer:
    3
    21
    1
    19


  19. 100, 66
  20. Your answer:
    2
    8
    16
    none of the answers provided


  21. 12, 24
  22. Your answer:
    4
    6
    12
    none of the answers provided


  23. 18, 36
  24. Your answer:
    6
    3
    none of the answers provided
    9


  25. 30, 36
  26. Your answer:
    none of the answers provided
    12
    6
    3


  27. 56, 24
  28. Your answer:
    3
    12
    4
    none of the answers provided


  29. 99, 33
  30. Your answer:
    66
    11
    none of the answers provided
    33



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