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# Growth and decay problems (exponential)

Teacher resources

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- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)

- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)

- Skills drill worksheet (15 questions on one side of A4; answers included)

- Random Question Generator – compound interest: find final amount
- Random Question Generator – growth and decay problems: find final amount
- Random Question Generator – growth and decay problems: find initial amount
- Random Question Generator – growth and decay problems: find rate of growth/decay
- Random Question Generator – growth and decay problems: find time period
- Random Question Generator – mixed questions

Links to past exam questions

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#### Unlimited practice questions: compound interest and depreciation

# Simple interest

*Simple* interest (as opposed to *compound* interest, covered above) is rarely seen in the real world, but can make appearances in maths textbooks and exams.

#### Unlimited practice questions: simple interest

Teacher resources

**Teachers**: log in to access the following:

- Random Question Generator – simple interest: find final amount
- Random Question Generator – simple interest: find rate of interest
- Random Question Generator – simple interest: find time period
- Random Question Generator – mixed questions

# Comparing simple and compound interest

This applet allows you to compare how an initial amount of £100 would grow over a period of up to 15 years at a given percentage rate using simple interest and compound interest. You can drag the slider underneath the horizontal axis to show year-by-year growth.

With thanks to Yip Wing Chung, Felix, whose Simple interest Compound interest worksheet is available here. Material modified and embedded here under the CC-BY-SA 3.0 license.In the real world

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