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 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

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

Back

7.9%.

Front

What percent of 125 is 18?

Back

14.4%.

Front

If Alex buys a car for $45,800 and sells it for $61,830, what is the percent change?

Back

35% 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.