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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 162 and 243 is 81

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Q: What is the greatest common factor of 162 and 243?
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The factors of 162 are:1, 2, 3, 6, 9, 18, 27, 54, 81, 162The factors of 243 are:1, 3, 9, 27, 81, 243The common factors are:1, 3, 9, 27, 81The Greatest Common Factor (GCF) is:81