The greatest common factor of 7 and 28 is 7.
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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 GCF of 28 and 105 is 7.
The common factors are 1 and 7. The GCF is 7.
the greatest common factor is 7
GCF(7, 28, 35) = 7