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

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

  3.   George wants to resurface the table below with ceramic tiles. What is the largest square tile that he can use without having to cut any tiles?
   
    A. 6 inches on each side B. 12 inches on each side
    C. 4 inches on each side D. 8 inches on each side
    Hint

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

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



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