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

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

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

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

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



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