It is: 42
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The greatest common factor of the numbers 210 and 84 is 42.
It is: 42
The greatest common factor of 126 and 210 is 42. 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 GCF is 7.
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!