Exploring Percent Change with Donuts

The video tutorial covers the concept of percent change, emphasizing its importance for eighth-grade students. It introduces a formula for calculating percent change and provides examples using donut orders and sales, as well as egg prices. The tutorial highlights key phrases like percent increase, decrease, and change, and offers practice problems for students to solve.

What is the formula for calculating percent change?

• Difference divided by original, then multiplied by 100

• Original divided by difference, then multiplied by 100

• Difference multiplied by original, then divided by 100

• Original multiplied by difference, then divided by 100

In the donut sales example, what was the original number of donuts sold in September?

• 3 dozen

• 4 dozen

• 5 dozen

• 2 dozen

What is the percent increase in donut sales from September to October?

• 33.3%

• 66.7%

• 50%

• 75%

Which of the following is NOT a keyword related to percent change problems?

• Percent increase

• Percent decrease

• Percent change

• Percent total

In the weekly donut sales example, what was the difference in the number of donuts sold between the two weeks?

• 125

• 120

• 100

• 145

What was the percent increase in the number of donuts sold from last week to this week?

• 20.04%

• 22.04%

• 26.04%

• 24.04%

In the egg price example, what was the original price of a dozen eggs in 1968?

• $1.00

• $0.75

• $1.54

• $0.53

What was the percent increase in the price of eggs from 1968 to 2018?

• 210%

• 200%

• 190%

• 180%

If the original recipe called for 5 cups of flour and the new one calls for 3 cups, what is the percent decrease?

• 40%

• 50%

• 30%

• 60%

What should you do if you are stuck on a percent change problem?

• Guess the answer

• Skip the problem

• Ask a friend for the answer

• Re-watch the examples