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

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

  3.   What is the greatest common factor of 64 and 40?
    A. 4 B. 20
    C. 8 D. 2
    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. 4x
    C. 4x2 D. 8x3
    Hint



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