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 126, 210, and 252 is 42
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60.
The question is confusing me. In order to have a "common factor", we must be comparing two or more numbers, like comparing 210 with something else. If you just want the largest factor of 210, it'll be 210. Nancy
The HCF/GCF of 385 and 210 is 35.
42