Percent of Change and Percent of Error Practice

Front

What is Percent of Change?

Back

Percent of Change is a measure of how much a quantity increases or decreases relative to its original amount, expressed as a percentage.

Front

How do you calculate Percent of Change?

Back

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

Front

What is Percent of Error?

Back

Percent of Error is a measure of how inaccurate a measurement is, expressed as a percentage of the actual value.

Front

How do you calculate Percent of Error?

Back

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

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

Last year, 2,376 people attended a summer music festival. This year, attendance was 2,950. What was the percent of change?

Back

Increase 24%

Front

Ann works for $10.00 per hour and receives a raise to $12.00. What is the percent of change in her hourly wage?

Back

Increase 20%

Front

Mrs. Mroc has 35 students in her class. If her class increases to 42 students next year, what will be the percent of change?

Back

20%

Front

Mary thought the umbrella was selling for $60 but it cost $50. What is her percent of error?

Back

20%

Front

What does a positive percent of change indicate?

Back

A positive percent of change indicates an increase in the quantity.