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 91 are 1, 7, 13, and 91.
The factors of 169 are 1, 13, and 169.
The common factors are 1 and 13. Therefore, the greatest common factor is 13.
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