Find the common factors of 20 and 28.

Given :

The given numbers are 20 and 28.

To do :

We have to find the common factors of 20 and 28.

Solution :

Factors of 20 are 

$20 = 1\times 20 = 2\times 10 = 4\times 5$

Therefore, factors of 20 are 1,2,4,5,10 and 20.

Factors of 28 are

$28 = 1\times 28 = 2\times 14 = 4\times 7$

Therefore, factors of 28 are 1,2,4,7,14 and 28.

The common factors of 20 and 28 are 1,2 and 4.