The greatest common factor of 28 and 42 is 7
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Factors of 28: 1, 2, 4, 7, 14, 28
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
GCF (28, 42) = 14
Common Factors: 14,7,2,1 Greatest Common Factor: 14
28 and 28
The greatest common factor can't be a smaller number than the least common factor, but if you meant least common multiple, 7 and 28 have a GCF of 7 and an LCM of 28.
The greatest common factor of 225 and 308 is 1.
The greatest common factor of 7 and 28 is 7.