# Question #76b19

Sep 18, 2016

$4 {y}^{2}$

#### Explanation:

It is generally easier to find the HCF and LCM of variables because they are already given in factor and index form.

We can see that thre is ${y}^{2}$ in each.

As for the numbers, 8 does not divide into 20, but 4 is a factor of 8 and of 20.

There are several common factors, but the Highest common factor is

$4 {y}^{2}$