Percent of Change and Percent of Error Practice

Front

What is Percent of Change?

Back

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

Front

How do you calculate Percent of Change?

Back

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

Front

What is Percent of Error?

Back

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

Front

How do you calculate Percent of Error?

Back

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

Front

If a student estimates 20 students in a class but there are actually 24, what is the percent of error?

Back

Percent of Error = (|20 - 24| / 24) x 100 = 16.67%.

Front

If last year's attendance was 2,376 and this year's is 2,950, what is the percent of change?

Back

Percent of Change = ((2950 - 2376) / 2376) x 100 = 24%.

Front

What does an increase in percent of change indicate?

Back

An increase in percent of change indicates that the new value is greater than the original value.

Front

What does a decrease in percent of change indicate?

Back

A decrease in percent of change indicates that the new value is less than the original value.

Front

If a product was thought to cost $60 but actually costs $50, what is the percent of error?

Back

Percent of Error = (|60 - 50| / 60) x 100 = 16.67%.

Front

What is the formula for calculating the actual value from the estimated value and percent of error?

Back

Actual Value = Estimated Value / (1 - (Percent of Error / 100)).