Calculating Percent Change: Key Concepts and Formulas

This video tutorial explains the concept of percent change, covering both percent increase and decrease. It provides a step-by-step guide on how to calculate percent change using examples, emphasizing the importance of understanding the relationship between absolute and relative changes. The tutorial also highlights common mistakes and encourages developing intuition to ensure accurate calculations. Viewers are encouraged to practice the concepts to reinforce learning.

What does 'percent' literally mean?

• Per 10

• Per 100

• Per 1000

• Per 50

If you start with $100 and gain $20, what is the percent increase?

• 25%

• 10%

• 20%

• 15%

What is the percent increase when the original amount is $750 and it increases by $150?

• 10%

• 15%

• 20%

• 25%

How do you calculate percent change?

• (Change in value / Original value) * 100

• New value minus original value

• Original value minus new value

• (Original value / Change in value) * 100

What is the percent increase if a doggie daycare's dog count goes from 25 to 28?

• 10%

• 12%

• 15%

• 20%

Using a coupon reduces the price of $65 shoes by $15. What is the percent decrease?

• 25%

• 30%

• 23%

• 20%

If a school's student population grows from 420 to 441, what is the percent increase?

• 3%

• 4%

• 6%

• 5%

What is the percent increase when the quantity doubles?

• 75%

• 100%

• 200%

• 50%

What is the percent decrease when the quantity is halved?

• 100%

• 75%

• 50%

• 25%

If you start with 1 and end up with 3, what is the percent increase?

• 250%

• 150%

• 200%

• 100%