The GCF is 21.
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The greatest common factor of 21 and 77 is 7.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor of 21, 9 is 3.
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 21 and 85 is 1.
3=1x330=2x3x533=3x11gcf is 3