Percent Change and Error

Front

What is percent change?

Back

Percent change is a measure of how much a quantity has increased or decreased relative to its original value, expressed as a percentage.

Front

How do you calculate percent change?

Back

Percent change is calculated using the formula: ((New Value - Old Value) / Old Value) * 100.

Front

What is the formula for calculating percent error?

Back

Percent error is calculated using the formula: (|Estimated Value - Actual Value| / Actual Value) * 100.

Front

If a value increases from 50 to 75, what is the percent change?

Back

The percent change is 50%.

Front

If a student estimates a test score to be 80 but the actual score is 90, what is the percent error?

Back

The percent error is 11.1%.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in value.

Front

How do you round a percent change to the nearest tenth?

Back

To round to the nearest tenth, look at the hundredths place; if it's 5 or more, round up.

Front

What is the percent change when a quantity decreases from 200 to 150?

Back

The percent change is -25%.

Front

If a product's price increases from $20 to $25, what is the percent increase?

Back

The percent increase is 25%.