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

  2.   What is the greatest common factor of 25a2b and 5ab2?
    A. 5a2b2 B. 5ab
    C. 5 D. 5ab2
    Hint

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

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