Exploring Percent Change and Percent Error Concepts

The video tutorial covers the concept of percent of change and percent error. It explains how to calculate the percent of change by comparing the change in quantity to the original amount, and how to determine if it's an increase or decrease. The tutorial provides examples using gas prices and iPad Mini prices. It also introduces percent error, which measures the accuracy of an estimate by comparing the error to the actual amount. Examples include estimating gumballs in a jar and measuring distance. The video emphasizes converting decimals to percentages by multiplying by 100.

What is the percent of change?

• A ratio comparing the original amount to the change in quantity

• A ratio comparing the change in quantity to the original amount

• A ratio comparing two different quantities

• A ratio comparing the final amount to the original amount

How do you calculate the percent of change?

• Subtract the original amount from the change in quantity

• Multiply the change in quantity by the original amount

• Divide the change in quantity by the original amount

• Divide the original amount by the change in quantity

If a price increases from $1.30 to $2.95, what is the percent of change?

• 95%

• 120%

• 127%

• 100%

What is the percent decrease if a price drops from $280 to $220?

• 35%

• 21.4%

• 30%

• 25%

What does the percent error measure?

• The accuracy of an estimate

• The final amount

• The original amount

• The change in quantity

How do you calculate the percent error?

• Subtract the estimated amount from the actual amount

• Multiply the amount of error by the actual amount

• Divide the amount of error by the actual amount

• Divide the actual amount by the estimated amount

If you estimate there are 300 gumballs in a jar but there are actually 400, what is the percent error?

• 30%

• 25%

• 20%

• 35%

What is the percent error if you estimate a distance to be 16.5 feet but it is actually 15 feet?

• 20%

• 15%

• 10%

• 5%

What is the final step to convert a decimal to a percent?

• Add 100

• Divide by 100

• Subtract 100

• Multiply by 100

What is the benefit of multiplying by 100 at the end of your calculation?

• It eliminates the need for a calculator

• It simplifies the calculation

• It ensures accuracy

• It converts the decimal directly into a percent