Percentage Decreases - Methods and Examples

The video tutorial explains how to calculate percentage decreases using different methods. It starts with an introduction to the concept of percentage decrease, providing examples like depreciation and discounts. The first method discussed is the unitary method, which is a non-calculator approach. The second method involves using a calculator to convert percentages to decimals for easier calculation. Finally, an advanced method is introduced, which uses a multiplier factor to simplify the process. Each method is demonstrated with examples to ensure understanding.

What is a real-life example of percentage decrease?

• Adding tax to a bill

• Depreciation of a car's value

• Calculating interest on savings

• Increasing the price of a product

In the unitary method, how do you find 1% of a number?

• Multiply by 100

• Divide by 10

• Divide by 100

• Multiply by 10

How do you calculate 15% of a number using the unitary method?

• Subtract 15 from the number

• Divide the number by 15

• Multiply the number by 0.15

• Find 10% and 5% separately, then add them

What is the first step in the calculator method for percentage decrease?

• Add the percentage to the original amount

• Convert the percentage to a decimal

• Multiply the percentage by 100

• Subtract the percentage from 100

If you decrease 70 by 15% using the calculator method, what is the result?

• 59.5

• 55

• 65

• 60

In the advanced calculator method, what does the multiplier represent?

• The original value

• The percentage increase

• The remaining percentage after decrease

• The total percentage

How do you find the new value after a percentage decrease using the advanced method?

• Add the multiplier to the original value

• Divide the original value by the multiplier

• Multiply the original value by the multiplier

• Subtract the multiplier from the original value