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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 CIE IGCSE Maths Surds for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 3 (Core) or Paper 2 and Paper 4 (Extended) format. Start with the Core-tier fundamentals in number and algebra before moving on to the more demanding Extended-only topics like calculus-adjacent algebra and advanced trigonometry.

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