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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 81 and 99 is 9
The factors of 81 are 1, 3, 9, 27, 81

The factors of 99 are 1, 3, 9, 11, 33, 99

The GCF is 9
The GCF is 9.

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Q: What is the greatest common factor of 81 and 99?
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