Percent Change

What is Percent Change?
Percent change quantifies how much a value increases or decreases relative to its original amount, expressed as a percentage. Percent changes are often seen in word problems and are useful in many real world situations, for example when shopping sales or when calculating a tip. A percent change is a way to describe how much a quantity increases or decreases. For example, when you buy an item with tax, the tax is the percent change from the original price to what you paid.

The following diagram gives the percent change formula. Scroll down the page for more examples and solutions.

Percent Worksheets
Practice your skills with the following percent worksheets:
Online & Printable Percent Worksheets

Types of Problems in Algebra:
Algebraic problems involving percent change can ask you to find:

1. The Percent Change (P): Given the original and new values (or expressions).
2. The New Value (N): Given the original value (or expression) and the percent change.
3. The Original Value (O): Given the new value (or expression) and the percent change.

Percent Change
This video explains how to determine percent of change: Percent Increase and Decrease

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Percent of Change (percent increase or decrease)
How to calculate percent change?

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Percent Increase or Decrease
Lesson on finding percent of change

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