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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 Oxford AQA IGCSE Maths Reverse Percentages for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) format. Since content from any part of the specification can appear on either paper, keep number and algebra fluency sharp throughout the course rather than leaving it until near the exam.

Lessons

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