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11876879
Surds
Description
How to rationalise the denominator and simplify surds.
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maths
maths
year 11
Mind Map by
Olivia Dawkins
, updated more than 1 year ago
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Created by
Olivia Dawkins
over 6 years ago
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Resource summary
Surds
Rationalising the denominator
When a surd is on the bottom we rationalise it to get it on the top.
We do this by multiplying the bottom and top by the surd that is at the bottom
Simplify this until you have a normal equation.
This could get you 2 - 3 marks.
/ab = /a x /b
This means when one is a square number we can get rid of it.
For example /8 = /4 x /2
/4 is equal to /2.
Therefore we can simplify /8 to 2/2
Try this website from some quick practise.
http://bbc.co.uk/gcsebitesize/maths/number/surdrev1.shtml
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