Percent of Change
Percent of Change is a Grade 7-8 math skill that measures how much a quantity increases or decreases relative to its original value, expressed as a percentage. Students use the formula: Percent of Change = (Amount of Change / Original Amount) times 100, and classify results as percent increase or percent decrease.
Key Concepts
New Concept Percents can describe a change, like an increase or decrease. We use a special three row ratio table (Original, Change, New) to solve these problems. What’s next You're just getting started! Next, you’ll tackle worked examples using this ratio table to find sale prices, original costs, and the exact amount of a change.
Common Questions
What is percent of change?
Percent of change measures how much a value has changed relative to the original: (New Value minus Original Value) divided by Original Value, times 100.
What is the difference between percent increase and percent decrease?
Percent increase occurs when the new value is greater than the original. Percent decrease occurs when the new value is less than the original.
How do you find percent of change?
Find the amount of change by subtracting the original from the new value, then divide by the original and multiply by 100.
What is an example of percent of change?
If a price goes from $40 to $50, the change is $10. Percent increase = 10/40 times 100 = 25%.
What grade covers percent of change?
Percent of change is a core Grade 7 topic and is reinforced in Grade 8.