# Surds

### Description

A very quick overview of surds with some links to help.
Mind Map by Thomas Marshall, updated more than 1 year ago
 Created by Thomas Marshall about 8 years ago
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14

## Resource summary

Surds
1. √ab=√a X √b
1. This means when one is a square number we can get rid of it. For example. √8=√4 X √2.
1. √4=2
1. Therefore simplified we can make it equal to 2√2
2. Rationalise the denominator
1. When a surd is on the bottom we rationalise it to get it on the top.
1. We do this by X the bottom and top by the surd that is on the bottom.
1. This picture is an example of what to do.
1. This link is quite good as well
2. What is a Surd?
1. A number that cannot be shown as a decimal has it has a never ending never repeating set of decimals like pie does.
2. Try this website for some quick practice
1. http://www.bbc.co.uk/schools/gcsebitesize/maths/number/surdsrev1.shtml

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