The GCF is 1.
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The Greatest Common Factor of 28 and 60 is four. 28 divided by 4 is 7, and 60 divided by 4 is 15. To show that it is the greatest 7 nor 15 can be reduced.
The greatest, and only, common factor of 57 (=3x19) and 28 (=22x7) is 1.
The Greatest Common Factor of 28, 42, 63: 7
The greatest common factor for 7 and 28 = 7.
The greatest common factor for 7 and 28 is 7