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The GCF of 4 and 23 is 1

Definition: 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 the numbers have in common.

Method:

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 4 are 1, 2, and 4.

The factors of 23 are 1 and 23.

The only common factor is 1. Therefore, the greatest common factor is 1, which means the numbers are relatively prime.

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