1.   Based on the factor trees, what is the greatest common factor of 8 and 20?
    A. 8 B. 20
    C. 2 D. 4
    Hint

  2.   What is the greatest common factor of 22, 66, and 110?
    A. 66 B. 22
    C. 11 D. 2
    Hint

  3.   What is the greatest common factor of 16x2 and 12x?
    A. 12x B. 4x
    C. 4x2 D. 16x2
    Hint

  4.   What is the greatest common factor of 64 and 40?
    A. 2 B. 20
    C. 4 D. 8
    Hint

  5.   What is the greatest common factor of 36, 54, and 90.
    A. 9 B. 6
    C. 36 D. 18
    Hint



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