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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, 28, and 56 is 7
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Greatest common factor of 16 and 28?
The greatest common factor of 16 and 28 is 4
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Greatest common factor of 28 and 48?
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What is the greatest common factor of 28 and 140?
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