What is the GCF of 21 and 63?

1 Answer
sente ยท Skittles
Oct 23, 2016

21

Explanation:

The GCF (greatest common factor) of two numbers is the greatest number which is a factor of both of them.

The factors of 21 are: 1, 3, 7, 21

The factors of 63 are: 1, 3, 7, 9, 21, 63

The greatest number which is on both lists is 21, meaning 21 is the greatest common factor.

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