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Working backwards with percentages

Working backwards with percentages

Bar models comparing original 100 percent with final 106 percent after an increase, and original 100 percent with sale price 80 percent after a 20 percent discount

A reverse percentage question asks you to find the original amount before a percentage change happened. The original amount is always 100%100\%100%, and the final amount is after the increase or decrease.

Reverse Percentages Lesson

  1. IGCSE
  2. /Maths
  3. /Reverse Percentages

Step-by-step lessons covering Edexcel IGCSE Maths Reverse Percentages 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

Reverse PercentagesStandard FormSpeed and DensityChanging the Subject of a FormulaExpanding and Factorising QuadraticsSolving QuadraticsDrawing Quadratic GraphsSimultaneous EquationsSimilar Shapes (Lengths)SOHCAHTOA (Trigonometry)Venn DiagramsData