You factor out primes from the root, for example: root 100 you can get 10 from it, or we'll use 5
100/5=20 20/5=4 root 4= 2 because there are 2 "5" we can bring that out of the root, there are 2 "2" so we bring that out too. When a number is taking out of a root, the 2 exact same numbers become one. in this case, there are ONE 5 and ONE 2 outside the root. then You multiply 5 and 2 together, and you get 10
