x

What bounds mean

What bounds mean

Number line with 20.5 as a filled endpoint and 21.5 as an open endpoint for 21 cm to the nearest cm

A rounded measurement is not exact. If a length is given as 21 cm to the nearest cm, the true value lies in a continuous interval of possible values.

Bounds Lesson

  1. IGCSE
  2. /Maths
  3. /Bounds

Step-by-step lessons covering Edexcel IGCSE Maths Bounds 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