# The square root

6 videos

3 skills

A strong contender for coolest symbol in mathematics is the radical. What is it? How does it relate to exponents? How is the square root different than the cube root? How can I simplify, multiply and add these things?
This tutorial assumes you know the basics of exponents and exponent properties and takes you through the radical world for radicals (and gives you some good practice along the way)!

### Square roots of perfect squares

PRACTICE PROBLEMS

Practice finding the square root of a perfect square positive integer.

### Approximating square roots to hundredths

VIDEO
7:12 minutes

Learn how to approximate the decimal value of √45 without using a calculator.

### Approximating square roots

PRACTICE PROBLEMS

Practice finding the approximate value of square roots by thinking about perfect squares.

### Simplifying square roots

VIDEO
3:09 minutes

Sal rewrites 5√117 as 15√13, and finds that 3√26 cannot be simplified further.

### Square roots and real numbers

VIDEO
10:19 minutes