One number can not have a common factor so there is NO GCF.. you need at least 2
You would use common factors for fractions, so to find the GCF you need 2 factors. (Assuming 1 and 28 here, it would be 28)
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The greatest common factor of 16 and 28 is 4
The Greatest Common Factor of 28, 48 is 4.
The greatest common factor of 48 and 28 is 4.
The greatest common factor of 28 and 49 is 7.
The GCF (Greatest Common Factor) of 28 and 140 is: 2828.