what is the gcf of 20 and 40

Question

My Daughter is in  5th grade and she needs this problem to be solved she loves this site and she refuses to use a different site please help my daughter solve this

Answer 1

First we list all of the factors of 20 and 40.

 

 

Factors of 20:  1, 2, 4, 5, 10, 20

Factors of 40:  1, 2, 4, 5, 8, 10, 20, 40

 

 

Greatest common factor is 20.