The GCF is 7.
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The factors of 21 and 1,3,7, and 21Now since 21 is not a factor of 49, but 7 is we can say right away the GCF is 7.
It is: 7
The GCF of 21, 49 and 115 is 1.
7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.
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, 49, and 70 is 7