Understanding Percent Change and Applications

Mr. Allred introduces a math lesson on percent machines, focusing on calculating unknown numbers using percentages. The lesson includes a warm-up and activities to practice calculating original values, new values, and percent changes. Students are encouraged to engage with slides and challenges to understand the concepts better. The video covers slides one through seven, with a focus on understanding the percent machine's operations. The class will reconvene on January 25th to review and discuss further.

What is the main goal of the lesson on percent machines?

• To learn about different types of machines

• To calculate unknown numbers using percentages

• To understand the history of percentages

• To memorize percentage formulas

In the warm-up activity, what does the percent machine do to a number?

• Increases it by 100%

• Leaves it unchanged

• Decreases it by 25%

• Increases and then decreases it by 50%

If you input 20 into the percent machine, what is the final output after the operations?

• 25

• 10

• 15

• 20

What is the percent increase if 60 goes into the machine and 72 comes out?

• 20%

• 15%

• 25%

• 10%

If a number increases by 20% and becomes 36, what was the original number?

• 40

• 28

• 32

• 30

What strategy does Kai Tai use in the final challenge?

• He uses a calculator

• He asks a friend

• He guesses the number

• He applies the percent change formula

In the final challenge, what happens to the number after it increases by 50% and decreases by 5%?

• It doubles

• It becomes larger than the original

• It becomes smaller than the original

• It remains the same

What is the next step after completing the video lesson?

• Submit homework

• Take a test

• Attend a workshop

• Review the slides by Monday

What is the date of the next class review?

• January 20th

• January 25th

• February 5th

• February 1st

What should students do with their thoughts on slides one through seven?

• Share them with a friend

• Write them down

• Forget them

• Prepare them for class