rationalise
What rationalise means in Mathematics GCSE, as defined for AQA, Pearson Edexcel.
Definitions of rationalise
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain rationalise in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: Pearson Edexcel
Rewrite a fraction so that its denominator contains no surd, without changing its value.
Rewrite a fraction so its denominator contains no surd, for example 1/√3 as √3/3.
Topics that use rationalise
- Mensuration and calculation (AQA GCSE)
- Geometry and measures - Mensuration and calculation (Pearson Edexcel GCSE)
Related terms
- arc length
- Circumference
- Diameter
- Frustum
- Hypotenuse
- included angle
- perpendicular height
- Pythagoras' theorem
Using rationalise in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Mathematics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge