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 the formula for calculating percent increase?

Back

Percent Increase = ((New Value - Old Value) / Old Value) x 100.

Front

What is the formula for calculating percent decrease?

Back

Percent Decrease = ((Old Value - New Value) / Old Value) x 100.

Front

If the price of an item increases from $50 to $75, what is the percent increase?

Back

Percent Increase = ((75 - 50) / 50) x 100 = 50%.

Front

If the price of an item decreases from $80 to $60, what is the percent decrease?

Back

Percent Decrease = ((80 - 60) / 80) x 100 = 25%.

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 you estimate a distance of 100 meters but the actual distance is 90 meters, what is the percent error?

Back

Percent Error = (|100 - 90| / 90) x 100 = 11.11%.

Front

If you estimate a time of 30 minutes but the actual time is 25 minutes, what is the percent error?

Back

Percent Error = (|30 - 25| / 25) x 100 = 20%.