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 78 and 126 is 6
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The greatest common factor (GCF) is: 6
3.
The GCF of 78 and 104 is 26.
It is: 2
78 = 2 x 3 x 13, 28 = 2 x 2 x 7. Only, therefore greatest, Common Factor is 2.