The GCF is 6.
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The Greatest Common Factor (GCF) is: 18
18
The Greatest Common Factor (GCF) is: 2
The greatest common factor of 12, 18, and 42 is 6The 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 18.