3 = 1 x 3
5 = 1 x 5
7 = 1 x 7
GCF = 1
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45 = 3 * 3 * 5 63 = 3 * 3 * 7 126 = 2 * 3 * 3 * 7 Gcf = 3 * 3 = 9 45/9 = 5 63 / 9 = 7 126 / 9 = 14
The GCF is 210.. I believe..so nevermind.
The GCF is 2^3 x 5.
21. 42 = 2 x 3 x 7 63 = 32 x 7 105 = 3 x 5 x 7 gcf = 3 x 7 = 21
Divide both by their GCF (5) and you will get 3/7.