Percent Change & 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 Percent Error?

Back

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

Front

How do you calculate Percent Error?

Back

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

Front

If you estimate 200 and the actual value is 240, what is the Percent Error?

Back

16.7%.

Front

If the price of cheese increases from $5 to $6, what is the Percent Change?

Back

Increase 20%.

Front

If Mary weighs 180 pounds and now weighs 150 pounds, what is the Percent Change in her weight?

Back

17% Decrease.

Front

If Mr. Nacerino estimates 48 minutes for a run but takes 60 minutes, what is his Percent Error?

Back

20%.

Front

If you estimate sending 135 texts but actually sent 108, what is your Percent Error?

Back

25%.

Front

What does a positive Percent Change indicate?

Back

A positive Percent Change indicates an increase in value.