Technically, 7 is a Prime number so itself and 1 are the only candidates. If you consider 1 to be a factor, then the only common factor is 1, which is not useful in any application I know.
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The greatest common factor of 7 and 28 is 7.
The greatest common factor of 21 and 77 is 7.
The greatest common factor of 21 and 70 is 71000000The GCF is 7.The GCF is: 1The GCF is 7.
The greatest common factor of 18 , 7 = 1
1 is the greatest common factor of 7 and 8. There are no others.