If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains
*.kastatic.org and *.kasandbox.org are unblocked.
Square roots and cube roots
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? Learn all about square roots and cube roots in this tutorial.
Learn about the square root symbol (the principal root) and what it means to find a square root. Also learn how to solve simple square root equations.
Learn how to find the square root of perfect squares like 25, 36, and 81.
Practice finding the square root of a perfect square positive integer.
Learn the meaning of cube roots and how to find them. Also learn how to find the cube root of a negative number.
Practice finding the cube root of a perfect cube positive integer.
Practice solving equations by squaring or cubing both sides.
Practice taking square roots of decimals and fractions.
Learn how to find the cube root of -512.
Learn how to find the square root of a decimal number. The problem solved in this video is p^2 = 0.81.
Practice solving problems using your knowledge of square and cube roots.
Learn how to find the side length of a cube whose volume is 512 cubic centimeters.