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# What are the common factors of 21 and 63?

## Answer

###### Wiki User

###### July 11, 2016 1:49PM

The common factors of 21 and 63 are 1, 3, 7, and 21

## Related Questions

###### Asked in Factoring and Multiples

### What are the common factors of 42 and 63?

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 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
The factors of 63 are 1, 3, 7, 9, 21, and 63.
The common factors are 1, 3, 7, and 21.