Calculating Percentages and Their Applications

The video tutorial explains how to calculate percentages without a calculator by focusing on four key percentages: 50%, 25%, 10%, and 1%. It demonstrates how to derive these percentages and combine them to solve any percentage problem. The tutorial includes practical examples to illustrate these methods, such as calculating 5% or 35% by using combinations of the basic percentages. The video emphasizes the importance of memorizing these calculations to handle percentage questions efficiently.

What is the first step to find 50% of a number?

• Divide by 4

• Divide by 2

• Divide by 10

• Divide by 100

How do you calculate 1% of a number?

• Divide by 10

• Divide by 4

• Divide by 100

• Divide by 2

What is 50% of 30?

• 25

• 10

• 15

• 20

How do you find 25% of a number?

• Divide by 4

• Divide by 100

• Divide by 2

• Divide by 10

What is 10% of 160?

• 16

• 32

• 40

• 80

How would you calculate 5% of a number?

• Find 25% and then divide by 5

• Find 1% and then multiply by 5

• Find 10% and then half it

• Find 10% and then double it

What is 5% of 700?

• 35

• 70

• 140

• 350

How can you calculate 40% of 800?

• Find 25% and add 15%

• Find 10% and multiply by 4

• Find 50% and subtract 10%

• Find 1% and multiply by 40

What is 20% of 23?

• 2.3

• 9.2

• 4.6

• 6.9

How do you find 20% of a number?

• Find 50% and divide by 2.5

• Find 1% and multiply by 20

• Find 25% and subtract 5%

• Find 10% and double it