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.
Step-by-step lessons on Edexcel IGCSE Maths Surds. Each one builds up to exam-style questions. 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.