Percent of Change and Percent of Error Practice

Front

What is the formula to calculate percent of change?

Back

Percent of Change = (New Value - Original Value) / Original Value × 100%

Front

If the original cost is $5 and the new cost is $1, what is the percent of change?

Back

Decrease 80%

Front

If the original cost is $50 and the new cost is $60, what is the percent of change?

Back

Increase 20%

Front

What does a percent of change of 0% indicate?

Back

No change in value.

Front

What is the percent of error formula?

Back

Percent of Error = |Estimated Value - Actual Value| / Actual Value × 100%

Front

If Renee thinks it will take 95 minutes to run 7 miles but runs it in 80 minutes, what is her percent of error?

Back

18.75%

Front

If Connie thinks she types 39 words/minute but actually types 56 words/minute, what is her percent of error?

Back

30.36%

Front

What does a negative percent of change indicate?

Back

A decrease in value.

Front

If Mary lost 30 pounds and weighed 180 pounds before her diet, what is the percent of change?

Back

17% Decrease

Front

What is the significance of understanding percent of change in real life?

Back

It helps in comparing prices, understanding discounts, and evaluating performance.