Since 6 is a factor of 102, it is automatically the GCF.
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It is: 6
The GCF is 6.
The GCF is of 30, 54, and 102 is 6.
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 36 and 99 is 9.
The lowest common factor of any set of positive integers is 1.