Percent Change and Percent Error Practice

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 = (|Measured Value - Actual Value| / Actual Value) x 100.

Front

What is the formula for percent decrease?

Back

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

Front

What is the formula for percent increase?

Back

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

Front

If a tank of water decreases from 12 gallons to 8.4 gallons, what is the percent change?

Back

Percent Change = ((8.4 - 12) / 12) x 100 = -30% (30% decrease).

Front

Emma cut 80 cm of ribbon instead of 84 cm. What is her percent error?

Back

Percent Error = (|80 - 84| / 84) x 100 = 4.76% (approximately 5.0%).

Front

A sweater's price drops from $45 to $36. What is the percent decrease?

Back

Percent Decrease = ((45 - 36) / 45) x 100 = 20%.

Front

Terry's hourly wage increased from $10 to $15. What is the percent increase?

Back

Percent Increase = ((15 - 10) / 10) x 100 = 50%.