Percentage Decreases - Methods and Examples

The video tutorial explains percentage decrease, a method to find a percentage of an amount and subtract it from the original. It covers two methods: the unitary method, which is non-calculator based, and the calculator method, which involves converting percentages to decimals. The tutorial also introduces an advanced calculator method using a multiplier. Examples include calculating the decreased value of items like cars and shop discounts. The video emphasizes understanding the concept of taking away from the original amount to ensure the result is less than the starting value.

What is a common real-life example of percentage decrease?

• Increasing the price of a product

• Calculating interest on savings

• Depreciation of a car's value

• Adding tax to a purchase

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

• Multiply by 100

• Multiply by 10

• Divide by 10

• Divide by 100

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

• Divide the number by 15

• Subtract 15 from the number

• Multiply the number by 0.15

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

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

• Add the percentage to the original amount

• Subtract the percentage from 100

• Convert the percentage to a decimal

• Multiply the percentage by 100

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

• 59.5

• 55.5

• 65.5

• 60.5

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

• The original value

• The percentage increase

• The remaining percentage after decrease

• The total percentage

How do you calculate the new value using the advanced calculator method?

• Divide the original value by the multiplier factor

• Add the percentage to the original value

• Multiply the original value by the multiplier factor

• Subtract the percentage from the original value