Percentage Calculations and Methods

Mr. Chen guides students through solving percentage problems using a number line method. He explains how to find what percent of 25 is 12, how to determine the whole number when 25% is 9, and how to calculate 75% of 124. The tutorial offers both algebraic and visual methods, encouraging students to pause and try solving the problems independently before checking their answers.

What should you do before watching the solution to a problem?

• Skip to the next problem.

• Watch the entire video first.

• Ask a friend for help.

• Pause the video and try solving it yourself.

What is the first step in finding what percent of 25 is 12?

• Divide 25 by 12.

• Use a calculator.

• Guess the answer.

• Draw a number line.

If 12 is a little less than half of 25, what percentage is it approximately?

• 40%

• 50%

• 48%

• 60%

How can you find the percentage using proportions?

• By using a calculator.

• By guessing the percentage.

• By setting up a proportion equation.

• By dividing the numbers directly.

What is the first step in solving 25% of what number is 9?

• Multiply 9 by 4.

• Divide 9 by 4.

• Use a number line.

• Guess the number.

If 9 is 25% of a number, what is the whole number?

• 45

• 36

• 18

• 27

What is the first step in finding 75% of 124?

• Multiply 124 by 0.75.

• Guess the number.

• Use a number line.

• Divide 124 by 3.

What is 75% of 124?

• 62

• 31

• 93

• 124

Which method can be used to visually find 75% of a number?

• Using a ruler.

• Guessing the number.

• Drawing a number line and dividing into quarters.

• Using a calculator.

What is an alternative method to find 75% of 124?

• Divide 124 by 4 and multiply by 3.

• Add 124 to itself.

• Multiply 124 by 0.5.

• Divide 124 by 2.