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

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

  3.   What is the greatest common factor of 16x2 and 12x?
    A. 4x2 B. 16x2
    C. 4x D. 12x
    Hint

  4.   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. 8 inches on each side B. 6 inches on each side
    C. 12 inches on each side D. 4 inches on each side
    Hint

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



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