Percent Change and Percent Error Practice

Front

What is percent change?

Back

Percent change is a way to express a change in a quantity as a percentage of the original amount. It is calculated using the formula: ((New Value - Old Value) / Old Value) x 100.

Front

How do you calculate percent increase?

Back

To calculate percent increase, use the formula: ((New Value - Old Value) / Old Value) x 100.

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: ((Old Value - New 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 true value. It is calculated using the formula: (|Measured Value - True Value| / True Value) x 100.

Front

If Terry's earnings increased from $10 to $15 per hour, what is the percent increase?

Back

50%.

Front

A shirt originally priced at $25 is now $17.50. What is the discount rate?

Back

30%.

Front

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

Back

5%.

Front

A TV's price increased from $299 to $599. What is the percent increase?

Back

100%.

Front

The price of a sweater decreased from $45 to $36. What is the percent decrease?

Back

20%.

Front

What is the formula for calculating discount rate?

Back

Discount Rate = (Discount Amount / Original Price) x 100.