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

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

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

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

  5.   What is the greatest common factor of 14p2q and 42p3q2?
    A. 14pq B. 7p2q2
    C. 7pq D. 14p2q
    Hint



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