156 = 2 x 2 x 3 x 13, 504 = 2 x 2 x 2 x 3 x 3 x 7 so GCF is 2 x 2 x 3 ie 12.
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The GCF is 24.
The GCF is 72.
The GCF is 84.
Greatest Common Factor (GCF) for 72 168 is 24.Least Common Multiple (LCM) for 72 168 is 504.
The GCF is 52.