Percent Change and Percent 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 = ((New Value - Old Value) / Old Value) x 100.

Front

What is the formula for percent error?

Back

Percent Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

How do you find the percent increase?

Back

Percent Increase = ((New Value - Old Value) / Old Value) x 100.

Front

How do you find the percent decrease?

Back

Percent Decrease = ((Old Value - New Value) / Old Value) x 100.

Front

If a price increases from $50 to $60, what is the percent change?

Back

20% increase.

Front

If a length decreases from 40 inches to 30 inches, what is the percent change?

Back

25% decrease.

Front

What is the percent error if the actual value is 50 and the estimated value is 45?

Back

10% error.

Front

What is the percent error if the actual value is 100 and the estimated value is 90?

Back

10% error.

Front

If a student scores 80 on a test but estimates they would score 70, what is the percent error?

Back

12.5% error.