Percent Change and Percent Error

Front

What is percent change?

Back

Percent change describes how much a quantity has changed relative to its original amount, expressed as a percentage.

Front

How do you calculate percent change?

Back

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

Front

What is percent error?

Back

Percent error measures the accuracy of an estimate compared to the actual value, expressed as a percentage.

Front

How do you calculate percent error?

Back

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

Front

If the actual speed is 38 mph and the estimated speed is 35 mph, what is the percent error?

Back

7.9%.

Front

If the price of an item decreases from $50 to $46, what is the amount of change?

Back

$4.

Front

If the estimated length is 32 in. and the actual length is 54 in., what is the percent error?

Back

40.7%.

Front

If the number of words increases from 53 to 62, what is the percent change?

Back

17.0% increase.

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.