Percentage Increases and Decreases

The video tutorial explains how to increase or decrease a quantity by a given percentage. It covers the traditional method of calculating the percentage of a number and adding or subtracting it from the original amount. The tutorial then introduces a more efficient method using multipliers, which simplifies the process by converting percentages to decimals and multiplying them with the original amount. This method is applicable for both percentage increases and decreases, and the video provides examples for each scenario.

What is the first step in increasing an amount by a given percentage?

• Subtract the percentage from the amount

• Find the percentage of the amount

• Multiply the amount by 100

• Divide the amount by the percentage

If you increase 520 by 30%, what is the final amount?

• 676

• 520

• 156

• 680

What is the decimal equivalent of a 30% increase?

• 0.03

• 3.0

• 1.3

• 0.3

What is the multiplier for a 2.5% increase?

• 1.0025

• 1.022

• 1.25

• 1.025

How do you calculate a 210% increase using a multiplier?

• Multiply the original amount by 2.1

• Multiply the original amount by 0.21

• Multiply the original amount by 3.1

• Multiply the original amount by 1.1

What is the first step in calculating a percentage decrease?

• Add the percentage to the amount

• Find the percentage of the amount

• Subtract the percentage from the amount

• Multiply the amount by the percentage

What is the decimal equivalent of a 12% decrease?

• 0.12

• 0.88

• 1.12

• 0.012

If you decrease 720 by 12%, what is the final amount?

• 86.40

• 800

• 720

• 633.60

What is the multiplier for a 7.5% decrease?

• 0.075

• 0.925

• 0.0075

• 1.075

If you decrease an amount by 7.5%, what percentage of the original amount remains?

• 92.5%

• 7.5%

• 100%

• 75%