Simplify using perfect squares or factor trees. show your work. 1. √400

10 square root 4

To find this, find the two numbers that multiply to get 400, in this case, we use 20. Then repeat the process until you get to the smallest numbers possible. I got two sets of 5 and 2. Because of this, you need to multiply both by the amount of each such as, if there are two fives then multiply the five by two and etc. 

Hope this helps!