Percent Change and Calculations

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, resulting in a negative 32% change. The second example shows an increase from 10 to 22, resulting in a 120% change. The video emphasizes the importance of using the original number for calculations and understanding the significance of positive and negative results. Mr. J concludes with a recap of the key points.

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

• Subtract the old number from the new number

• Add the old and new numbers

• Divide the new number by the old number

• Multiply the old number by 100

In Example 1, what is the amount of change from 50 to 34?

• 16

• 50

• -16

• 34

How can the result of Example 1 be expressed?

• Negative 32 percent

• 32 percent increase

• 34 percent increase

• 50 percent decrease

What does a negative percent of change indicate?

• A doubling

• No change

• An increase

• A decrease

In Example 2, what is the new number?

• 34

• 22

• 12

• 10

What is the percent of change from 10 to 22 in Example 2?

• 100 percent decrease

• 120 percent decrease

• 120 percent increase

• 100 percent increase

How do you convert a decimal to a percent?

• Add 100

• Divide by 100

• Subtract 100

• Multiply by 100

What does a positive percent of change indicate?

• An increase

• A decrease

• No change

• A reduction

How can you verify if a change is an increase or decrease?

• By comparing the numbers without calculation

• By adding the numbers

• By multiplying the numbers

• By checking if the result is positive or negative

What is the importance of dividing by the original number in percent change calculations?

• It makes the result a whole number

• It ensures the change is relative to the starting point

• It is not important

• It simplifies the calculation