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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.

One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 144 are 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, and 144.

The factors of 162 are 1, 2, 3, 6, 9, 18, 27, 54, 81, and 162.

The common factors are 1, 2, 3, 6, 9, and 18. Therefore, the greatest common factor is 18.

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Q: What is the greatest common factor of 144 and 162?
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