Exploring Percent Change in Math 7

Mr. Sullivan introduces the concept of percent change, explaining its importance in understanding changes in values, whether increases or decreases. He provides several examples, including Mr. Brust's lift, Kaiserslautern High School's student population, Kamiko's basketball scores, and Mr. Kelly's craziness score, to illustrate how to calculate percent change. The video concludes with encouragement to practice and seek help if needed.

Why is it important to understand percent change?

• To calculate the exact amount of change

• To avoid using large numbers

• To compare only small numbers

• To describe changes in quantities in a standardized way

If a quantity increases from 50 to 70, what is the percent increase?

• 70%

• 50%

• 40%

• 20%

In the example of Mr. Brust's weightlifting, what was the original weight he could lift?

• 60 pounds

• 40 pounds

• 70 pounds

• 50 pounds

How do you calculate the percent decrease if a quantity drops from 140 to 80?

• Subtract the original value from the new value, divide by the new value, and multiply by 100

• Add the original value to the new value and divide by 2

• Subtract the new value from the original value, divide by the original value, and multiply by 100

• Divide the new value by the original value and multiply by 100

What was the percent decrease when the quantity dropped from 140 to 80?

• 57.1%

• 60%

• 50%

• 42.9%

In the practice problem, what was the percent increase when the quantity changed from 35 to 92?

• 92%

• 35%

• 162.9%

• 57%

What was the original number of students at Kaiserslautern High School?

• 580

• 630

• 700

• 500

What was the percent decrease in the number of students at Kaiserslautern High School?

• 15%

• 7.9%

• 10%

• 12.5%

How much did Kamiko's points increase from her first to her second basketball game?

• 108.3%

• 75%

• 50%

• 100%

What was the percent increase in Mr. Kelly's craziness score?

• 47.9%

• 122.4%

• 64.3%

• 74.5%