1.   What is the greatest common factor of 36 and 45?
    A. 36 B. 3
    C. 45 D. 9
    Hint

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

  3.   What is the greatest common factor of 16x2 and 12x?
    A. 4x2 B. 12x
    C. 16x2 D. 4x
    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 14p2q and 42p3q2?
    A. 7pq B. 7p2q2
    C. 14pq D. 14p2q
    Hint



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