**In this module, you can ****study how to calculate percent increase and percent decrease.**

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- Study percent changeStudy percent change at mathgoodies.com, then try a few problems on your own. This page expects you to understand the concept of "absolute value", which is talked about in the link below.

100 reduced by 25% is 75, but 75 increased by 25% is not 100!

If an house price increases 20% one year and 10% the next year, it has gone up 32% (not 30%!) of the original value.

**Study and practice**

- Study percent change in more depthRead more about percent increase and decrease (or percent change) at mathsisfun.com. At the end you can try some problems.
- Quiz yourself on percent increase and decreaseTry these percent increase and decrease problems at onlinemathlearning.com.

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