Rationalising an expression means getting rid of any surds from the bottom (denominator) of fractions. Usually when you are asked to simplify an expression it means you should also rationalise it.

National 5 Simplifying expressions using the laws of indices Test questions Indices show where a number has been multiplied by itself, eg squared or cubed, or to show roots of numbers, eg square root.

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In this video I show you everything you need to know about how to Add and Subtract Radical Expressions involving Square Roots. Whether you're in Algebra, Algebra 2, Geometry or Trig, this method WORKS ...

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