x

What counts as a surd?

What counts as a surd?

A surd is an exact root that is irrational, such as 2\sqrt{2}2​ or 7\sqrt{7}7​. If the root evaluates to a whole number, then it is not a surd.

Surds Lesson

  1. IGCSE
  2. /Maths
  3. /Surds

Step-by-step lessons covering Edexcel IGCSE Maths Surds for IGCSE Maths. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build confidence with the shared Foundation-tier content first, since roughly 40% of Higher-tier marks are targeted at the grades 4–5 boundary that both tiers have in common.

Lessons

SurdsBoundsDirect and Inverse ProportionQuadratic FormulaFactorising Harder QuadraticsAlgebraic FractionsRearranging Harder FormulaeFinding the Area of Any TriangleThe Sine RuleThe Cosine Rule3d Pythagoras and TrigonometryThe Magnitude of a VectorHistogramsConditional Probability