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The greatest common factor (GCF) of 126 and 308 is 14.
Factors of 21: 1, 3, 7, 21.Factors of 308: 1, 2, 4, 7, 11, 14, 22, 28, 44, 77, 154, 308.GCF (21, 308) = 7
Factor them. 2 x 2 x 3 x 3 x 7 = 252 2 x 2 x 7 x 11 = 308 2 x 2 x 2 x 3 x 3 x 7 = 504 Select the common factors. 2 x 2 x 7 = 28, the GCF.
308 154,2 77,2,2 11,7,2,2
308 154,2 77,2,2 11,7,2,2