Calculating Percent Change Effectively

The video tutorial explains how to calculate percent change using a simple formula: (new value - old value) / old value. It emphasizes the importance of dividing by the original amount, not the new amount. The tutorial provides examples of calculating percent increase and decrease, such as a price change from $30 to $40 and from $100 to $80. Positive results indicate an increase, while negative results indicate a decrease. The video concludes with tips for recognizing changes and encourages viewers to explore more content on the channel.

What is the key factor to remember when calculating percent change?

• Divide by the new amount

• Divide by the original amount

• Multiply by the new amount

• Subtract the original amount

Which formula represents the percent change calculation?

• New minus old divided by old

• Old minus new divided by old

• Old minus new divided by new

• New minus old divided by new

If an item's price increases from $30 to $40, what is the amount of change?

• $40

• $30

• $70

• $10

In the example where the price increases from $30 to $40, what is the percent increase?

• 10%

• 33.3%

• 40%

• 25%

What does a negative result in the percent change formula indicate?

• An increase

• A decrease

• No change

• An error in calculation

If an item's price decreases from $100 to $80, what is the amount of change?

• $120

• $80

• $20

• $100

In the example where the price decreases from $100 to $80, what is the percent decrease?

• 25%

• 20%

• 10%

• 30%

What is the formula for converting a decimal to a percentage?

• Multiply by 10

• Divide by 100

• Multiply by 100

• Divide by 10

Why is it important to specify whether a percent change is an increase or decrease?

• To avoid confusion

• To make the calculation easier

• To ensure accuracy

• To follow mathematical rules

What should you do if you get a negative number in the percent change formula?

• Understand it indicates a decrease

• Recalculate

• Convert it to a positive number

• Ignore it