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 36 and 45?
    A. 45 B. 3
    C. 9 D. 36
    Hint

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

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

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



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