How to Find the Percent of Increase and Percent of Decrease

The video tutorial explains how to calculate percent change, including both percent increase and decrease. It provides a formula for calculating percent change and emphasizes that the amount of change is always positive. The tutorial includes several examples, such as a snake's growth, a dog's weight loss, a temperature drop, a bike sale, and a sweatshirt markup, to illustrate the concept. Students are encouraged to practice calculating percent change using the provided examples.

What is the primary focus when identifying percent change?

• Determining the original amount

• Identifying if the change is an increase or decrease

• Calculating the exact percentage

• Finding the new amount

Which of the following is true about the amount of change in percent calculations?

• It can be zero

• It is always positive

• It can be negative

• It is always negative

In the example of the snake's growth, what was the percent increase from 10 cm to 25 cm?

• 200%

• 50%

• 150%

• 100%

If a class size increases from 57 to 65 students, what is the percent increase?

• 12%

• 18%

• 16%

• 14%

What is the percent decrease if a dog's weight drops from 50 pounds to 35 pounds?

• 40%

• 25%

• 35%

• 30%

A bike originally costs $270 and is now on sale for $189. What is the percent decrease?

• 35%

• 20%

• 30%

• 25%

A store owner marks up a sweatshirt from $10 to $35. What is the percent increase?

• 200%

• 250%

• 300%

• 350%