Percentage Change - GCSE Maths Definition

Reviewed by: Dan Finlay

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A percentage change is a way of expressing an increase, or decrease, in an amount (usually money) relative to the original amount.

For example, if the price of a TV increases from £400 to £450, the price has increased by £50, but expressed as a percentage of the original price, this would be 12.5%.

In GCSE Mathematics, you may be asked to find a new amount after a given percentage increase or decrease; alternatively you may be asked to find the percentage increase or decrease, given the 'before' and 'after' amounts.

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Dan Finlay

Reviewer: Dan Finlay

Expertise: Maths Subject Lead

Dan graduated from the University of Oxford with a First class degree in mathematics. As well as teaching maths for over 8 years, Dan has marked a range of exams for Edexcel, tutored students and taught A Level Accounting. Dan has a keen interest in statistics and probability and their real-life applications.

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