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This topic calculates percentage increase and decrease and finds the percentage change between an original and a new value using (change ÷ original) × 100. It's examined right across GCSE and iGCSE Maths. Work through it free on eClassroom, with clear worked examples and instantly-marked questions that build your confidence for the exam.
How you do it
Divide the change by the original amount, then multiply by 100. The original is the starting value, not the new one — using the wrong denominator is the most common way to lose the marks.
Before you start
Check percentages and multipliers first if this feels hard. It appears at Foundation and Higher tier. Keep it sharp for reverse percentages and growth.
What you learn
A percentage change increases or decreases an amount by a given percentage. To change an amount by a percentage, multiply by the right multiplier. A larger figure than the original is a profit; a smaller one is a loss. A single multiplier handles any increase or decrease, and you can chain them for successive changes. The course works through increasing and decreasing, working out a percentage change and multipliers in context. Every section has instant-feedback practice questions matched to Edexcel iGCSE 4MA1 and the other major GCSE boards, and the course finishes with full exam-style questions you mark yourself.
Related Topics
Percentage Change is part of the Ratio and Proportion strand of our free GCSE maths courses, studied in Foundation tier. The course is built from 3 concept sections, 2 worked examples and 3 check points before the exam-style set. Nearby topics in the same strand are Proportion Graphs, Ratio and Ratio & Algebra. For unlimited practice, the Ratio and Proportion revision engine builds new questions on demand and records your accuracy.
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