Identify the number or expression inside the root sign.
Simplify the expression inside the root first, if possible.
Check whether the number is a perfect square, perfect cube, or another perfect power.
Find the largest perfect square factor of the number.
Rewrite the root as the product of two roots.
Take the root of the perfect square factor.
Multiply the result by the remaining root.
If the number is not a perfect square, estimate its value using nearby perfect squares.
Use a calculator if an exact value is not possible by hand.