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 39 and 84 is 3
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The greatest common factor of 630 , 84 = 42
Greatest common factor of 420 and 504 is 84.
The Greatest Common Factor of 21, 63, 84: 21
The greatest common factor of the numbers 210 and 84 is 42.
It is: 28 which is the greatest common factor of 56 and 84