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

  2.   What is the greatest common factor of 22, 66, and 110?
    A. 22 B. 2
    C. 66 D. 11
    Hint

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

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

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



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