Calculating Percentages and Their Applications

The video tutorial explains an easy method to calculate 15% of 22. Instead of directly multiplying 15 by 22 and dividing by 100, the instructor breaks down the problem by calculating 10% and 5% separately. First, 10% of 22 is found by moving the decimal one place to the left, resulting in 2.2. Then, 5% is calculated as half of 10%, which is 1.1. Adding these two results gives 3.3, which is 15% of 22. This method simplifies mental calculations and is useful for practical applications like calculating tips.

What is the basic method to calculate 15% of a number?

• Multiply the number by 100 and divide by 15

• Subtract 15 from the number

• Multiply the number by 15 and divide by 100

• Add 15 to the number

How can you find 10% of a number easily?

• Add 10 to the number

• Move the decimal point one place to the left

• Divide the number by 10

• Multiply the number by 10

What is 10% of 22?

• 0.22

• 220

• 22

• 2.2

How do you calculate 5% of a number if you know 10% of it?

• Add 5 to the number

• Double the 10% value

• Subtract 10% from the number

• Take half of the 10% value

What is the final result when you add 10% and 5% of 22?

• $2.20

• $3.30

• $4.40

• $1.10