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The GCF of 7 and 21 is 7. Since 7 is a factor of 21, it is automatically the GCF.

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 7 are 1 and 7.

The factors of 21 are 1, 3, 7, and 21..

The common factors are 1 and 7. Therefore, the greatest common factor is 7.
The GCF is 7.

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โˆ™ 2017-12-04 02:33:20
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Q: What is the greatest common factor of 7 and 21?
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