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 - Original Value) / Original Value) x 100.

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

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the actual value.

Front

How do you calculate percent error?

Back

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

Front

What is the formula to find the new value after a percent increase?

Back

New Value = Original Value x (1 + Percent Increase).

Front

What is the formula to find the new value after a percent decrease?

Back

New Value = Original Value x (1 - Percent Decrease).

Front

If a car's price increases from $20,000 to $25,000, what is the percent change?

Back

Percent Change = ((25,000 - 20,000) / 20,000) x 100 = 25% increase.

Front

If a student's estimated score is 80 and the actual score is 70, what is the percent error?

Back

Percent Error = (|80 - 70| / 70) x 100 = 14.3%.