###### Asked in Factoring and Multiples

Factoring and Multiples

# What is the greatest common factor of 42 and 63?

## Answer

###### Wiki User

###### 11/28/2017

The greatest common factor (GCF) of 42 and 63 is **21**.

To find the GCF (greatest common factor) of two numbers, first prime factorize them.

42 = 2*3*7

63 = 3*3*7

The GCF must be able to contain factors such that if divided by 42 or 63, the answer will be an integer.

*The GCF is 21.*

21

###### Wiki User

###### 11/29/2009

21.

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