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.

Rationalise the denominator of \(\frac{\sqrt{8}}{\sqrt{6}}\). The denominator can be rationalised by multiplying the numerator and denominator by √6. (This has the same effect as multiplying it by 1, ...

Australian Advanced Maths Preparation. When fractions contain surds, write them in the best form.