Surds

Roots that won't simplify to a neat number — and how to handle them exactly.

Rationalising the Denominator

Learn why we never leave a surd on the bottom of a fraction, and how to rationalise the denominator by multiplying top and bottom by the surd.
Simplifying Surds

Learn what a surd is, how to simplify square roots by pulling out square factors, and how to multiply and divide surds.