Simple Interest - GCSE Maths Definition

Reviewed by: Dan Finlay

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Simple interest is an amount of money that is added to a savings or investment account that is based only on the original amount saved or invested.

For example, if simple interest is added at a rate of 5% annually, this would mean that 5% of the original investment amount is added at the end of every year the original amount is invested.

  • For a £20 000 investment,

  • made for 6 years (at 5% simple interest),

  • then 5% of £20 000 = £1000

  • and so £1000 will be added to the investment at the end of each year

  • So after 6 years, the investment would be worth £26 000

Simple interest is where "interest-doesn't-earn-interest" whereas compound interest deals with "interest-earns-interest".

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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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