Factors of 78: 1, 2, 3, 6, 13, 26, 39, 78.
Factors of 28: 1, 2, 4, 7, 14, 28.
GCF (78, 28) = 2
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The greatest common factor of 28 and 20 is 4.
The greatest common factor of 14, 28, and 70 is 14.
The greatest common factor of the numbers 28, 35 and 63 is 7.
12 = 1,2,3,4,6, 28 = 1,4,7 So the greatest common factor is
Factors of 14 -> 1,2,7,14 Factors of 28 -> 1,2,4,7,14,28 Factors of 42 -> 1,2,3,6,7,14,21,42 Greatest Common Factor = the largest factor all terms have in common Therefore GCF = 14