1.   Based on the factor trees, what is the greatest common factor of 8 and 20?
    A. 2 B. 20
    C. 8 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 25a2b and 5ab2?
    A. 5ab2 B. 5
    C. 5a2b2 D. 5ab
    Hint

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

  5.   What is the greatest common factor of 20x2 and 32x3?
    A. 8x B. 8x3
    C. 4x2 D. 4x
    Hint



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