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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 21 are 1, 3, 7, and 21.

The factors of 27 are 1, 3, 9, and 27.

The common factors are 1 and 3.

This means that the greatest common factor is 3.

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1 and 3

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11y ago
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Q: What are the common factor of 21 and 27?
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