Calculating Percent Change: Increase and Decrease

In this video, Mr. J explains how to calculate the percent of change using two examples. The first example demonstrates a decrease from 50 to 34, while the second example shows an increase from 10 to 22. The process involves finding the amount of change, dividing by the original number, and converting the result to a percentage. The video emphasizes the importance of identifying whether the change is an increase or decrease based on the sign of the result.

What is the first step in calculating the percent of change?

• Subtract the old number from the new number

• Add the old number to the new number

• Multiply the old number by 100

• Divide the new number by the old number

In the first example, what is the amount of change from 50 to 34?

• -34

• 34

• -16

• 16

Why is it important to note the negative sign in the percent of change?

• It indicates an increase

• It shows the calculation is incorrect

• It indicates a decrease

• It has no significance

What is the percent decrease from 50 to 34?

• -32%

• 32%

• 16%

• -16%

How can you express a percent decrease in two ways?

• As a positive number and as a percent increase

• As a positive number and as a fraction

• As a negative number and as a percent decrease

• As a negative number and as a fraction

In the second example, what is the new number?

• 10

• 12

• 22

• 50

What is the percent increase from 10 to 22?

• 22%

• 100%

• 120%

• 12%

How do you convert a decimal to a percent?

• Subtract 10

• Multiply by 100

• Multiply by 10

• Divide by 100

What does a positive percent change indicate?

• An error

• No change

• An increase

• A decrease

How can you double-check if the percent change is an increase or decrease?

• By multiplying the old number by 100

• By looking at the original and new numbers

• By adding the old and new numbers

• By dividing the new number by the old number