Percentage Calculations and Concepts

Mr. Chen guides students through solving percentage increase and decrease problems. He uses number lines and different methods to explain how to calculate percentage changes. The video covers increasing 8 meters by 25%, decreasing 50 points by 26%, increasing 12 inches to 36 inches, and decreasing 50 pounds to 35 pounds. Mr. Chen encourages students to pause the video, try solving the problems themselves, and then check their answers. The tutorial concludes with a call to action to like and subscribe.

What should you do before watching the solutions in the video?

• Ask a friend for help.

• Skip to the end of the video.

• Pause the video and try the problems yourself.

• Watch the entire video first.

If you have 8 meters and increase it by 25%, what is the new length?

• 9 meters

• 10 meters

• 12 meters

• 11 meters

How can you visually represent the increase of 8 meters by 25%?

• Using a pie chart

• Drawing a number line

• Creating a bar graph

• Using a scatter plot

What is 25% of 8 meters?

• 4 meters

• 1 meter

• 3 meters

• 2 meters

If you decrease 50 points by 26%, what is the new score?

• 38 points

• 39 points

• 40 points

• 37 points

What is 26% of 50 points?

• 10 points

• 11 points

• 12 points

• 13 points

What is the percentage increase from 12 inches to 36 inches?

• 200%

• 150%

• 100%

• 250%

How many inches did the length increase from 12 to 36 inches?

• 24 inches

• 12 inches

• 48 inches

• 36 inches

What is the percentage decrease from 50 pounds to 35 pounds?

• 20%

• 25%

• 30%

• 35%

How many pounds did the weight decrease from 50 to 35 pounds?

• 10 pounds

• 15 pounds

• 20 pounds

• 25 pounds