9
^
3x3
9 3,3
the factor tree of 9 is 3 squared, or 3 x 3. 9 breaks down into 3 and 3.
9 3,3
9 3,3
9 3,3
9 3,3 54 27,2 9,3,2 3,3,3,2
63 ^ 7*9 ^ 3*3
In the case of 27, there is only one possible factor tree - using the factors 3 and 9 as the first step. 27 3 x 9 3 x (3x3)
9 3,3 18 6,3 2,3,3 The GCF is 9.
99 9, 11 3, 3, 11
27 3, 9 3, 3, 3
18 9 2 33 3 2