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

  2.   What is the greatest common factor of 36 and 45?
    A. 9 B. 36
    C. 3 D. 45
    Hint

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

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

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



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