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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 45 are 1, 3, 5, 9, 15, and 45.

The factors of 77 are 1, 7, 11, and 77.

The only common factor is 1. Therefore, the greatest common factor is 1.

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Q: What is the greatest common factor of 45 and 77?
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