The GCF is 1.
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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 18 , 7 = 1
1 is the greatest common factor of 7 and 8. There are no others.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 6, 7, and 8 is 1