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

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

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

  4.   What is the greatest common factor of 39 and 18?
    A. 6 B. 3
    C. 9 D. 13
    Hint

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



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