Question 160239
The common factor of two (or more) integers is the integer that is a factor of both (or all) numbers. 


What are the common factors of 28 and 32?

Factors of 28: 2, 4, 7, 14

Factors of 32: 2, 4, 8, 16 

What numbers from the list of factors belong to both 28 and 32?  

How about 2 and 4?  They are both factors of 28 and 32.