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, compared to the true value, expressed as a percentage.

Front

How do you calculate percent error?

Back

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

Front

What is a discount rate?

Back

The discount rate is the percentage reduction from the original price of an item.

Front

How do you calculate the discount rate?

Back

Discount Rate = ((Original Price - Sale Price) / Original Price) x 100.

Front

If a water tank starts with 12 gallons and ends with 8.4 gallons, what is the percent change?

Back

30%.

Front

Avery estimated 50 envelopes but used 75. What was the percent error?

Back

33%.

Front

Sophia found a shirt originally priced at $25, now on sale for $17.50. What is the discount rate?

Back

30%.

Front

Arjun estimated 30 minutes for his math homework but finished in 25 minutes. What is the percent error?

Back

20%.