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This lesson will help students learn how to find percent change using the percent change formula and using equivalent fractions.
What is Percent Change?
Percent change measures how much a quantity increases or decreases relative to its original value, expressed as a percentage.
The following diagram gives the formula to find percent change. Scroll down the page for more examples and solutions.
Percent Worksheets
Practice your skills with the following percent worksheets:
Online & Printable Percent Worksheets
Steps to using the percent change formula
Percent Increase
Example: A product’s price rose from $50 to $70. What’s the percent increase?
Percent Decrease
Example: A company’s employees dropped from 200 to 150. What’s the percent decrease?
Common Mistakes to Avoid
❌ Using the wrong denominator: Always divide by the original (old) value.
❌ Ignoring negative signs: A negative result means decrease (no need to say “-10% decrease” just say “10% decrease”).
Percent of Change
This video explains how to determine percent of change: Percent Increase and Decrease
Percent Increase and Decrease Word Problems
This video explains how to calculate the percent of change using the percent increase and decrease formula.
Calculating Percent Change Using Equivalent Fractions
Percent change can be calculated by setting up an equivalent fraction (proportion) comparing the change in value to the original value.
Here are the steps:
Here are some videos that use equivalent fractions to find percent change.
Percent Change
Solving Percent Change Problems
Try out our new and fun Fraction Concoction Game.
Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.
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