The greatest common factor of 28 and 20 is 4.
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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
28 is a factor of 56, and 28 is also a factor of itself. So the highest common factor of 28 and 56 is 28.