Understanding Percent of Change and Percent Error

What is the percent of change when a quantity increases from 50 to 75?

• 25%

• 50%

• 75%

• 100%

If a quantity decreases from 100 to 80, what is the percent of change?

• 20% decrease

• 20% increase

• 25% increase

• 25% decrease

In the example of students increasing from 20 to 24, what was the percent of change?

• 25% increase

• 20% increase

• 15% increase

• 10% increase

How do you determine if a percent of change is an increase or a decrease?

• By checking if the percent is positive or negative

• By checking if the percent is above or below 50%

• By calculating the absolute difference

• By comparing the final and original amounts

What is the percent of change when the number of trading cards decreases from 325 to 270?

• 16.92% increase

• 16.92% decrease

• 20% increase

• 20% decrease

What is the formula for calculating percent error?

• (Estimated Value - Actual Value) / Actual Value * 100

• (Actual Value - Estimated Value) / Estimated Value * 100

• (Estimated Value + Actual Value) / 2 * 100

• (Estimated Value - Actual Value) / Estimated Value * 100

If an estimate was $100 and the actual value was $80, what is the percent error?

• 12.5%

• 25%

• 20%

• 15%

In the context of percent error, what does the 'amount of error' refer to?

• The sum of the estimated and actual values

• The product of the estimated and actual values

• The ratio of the estimated to actual values

• The difference between the estimated and actual values

What is the purpose of multiplying by 100 in the percent error formula?

• To simplify the calculation

• To convert the error into a decimal

• To convert the error into a percentage

• To adjust for inflation

In the example of Ben's earnings, what was the percent error of his estimate?

• 10%

• 20%

• 12.5%

• 15%