A factor is a divisor - a number that will evenly divide into another number.
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 10 are 1, 2, 5, and 10.
The factors of 169 are 1, 13, and 169
The only common factor is 1, which is also the greatest common factor.
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