8 2 The Percent Equation
-
Upload
rlowery -
Category
Technology
-
view
1.109 -
download
0
description
Transcript of 8 2 The Percent Equation
![Page 1: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/1.jpg)
8.2 The Percent Equation
Solve problems by using the percent equation
![Page 2: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/2.jpg)
Turn and Talk
• What have we been talking about for the past couple of weeks?
• Why do we need to know how to use percents?
• What are some examples of surveys that would use percents?
![Page 3: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/3.jpg)
Pie Preferences
• Suppose 100 people were surveyed, how many preferred cherry pie?
![Page 4: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/4.jpg)
Pie Preferences
• Suppose 120 people were surveyed, how many people preferred pumpkin pie?
![Page 5: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/5.jpg)
T-table
• What does **is** mean?• What does **of** mean?
• PROPORTION• %/100=part/whole
• EQUATION:Part = Percent (whole)
![Page 6: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/6.jpg)
Example 1
• What number is 12% of 350?
![Page 7: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/7.jpg)
Example 2
• 21 is what percent of 40?
• On graph paper make a box with 40 squares inside.
• Shade in 21 boxes.
• About what percent is shaded?
• Find the exact answer.
![Page 8: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/8.jpg)
I have a quiz with a score of 90. What are different ways you could
have received that score?
![Page 9: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/9.jpg)
Example 3
• 13 is 26% of what number?
![Page 10: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/10.jpg)
Example 4
• What number is 46% of 200?
![Page 11: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/11.jpg)
Example 5
• 26 is what percent of 32?
![Page 12: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/12.jpg)
Example 6
• 12 is 40% of what number?
![Page 13: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/13.jpg)
• 2 group members choose a different rectangle to cut out on graph paper.
• 8 by 12
• 5 by 6
• The fold the rectangle into quarters and shade one of the quarters.
• How many squares are shaded?
• What is 25% of 96?
• What is 25% of 30?
![Page 14: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/14.jpg)
Example 7
• What percent of 125 is 75?
![Page 15: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/15.jpg)
Example 8
• 39 is 84% of what number?
![Page 16: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/16.jpg)
Finland has the highest percent of people who have cell phones,
67.8%. If there are about 3,499,000 people with cell phones, what is the population of Finland?
![Page 17: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/17.jpg)
In the year 2000, 102.2 million homes in the US had at least one
television. Of these, 86% also had VCRs. How many homes had
VCRs?
![Page 18: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/18.jpg)
ESTIMATIONchoose the correct answer
• What percent of 56 is 14?
a. 2%
b. 72%
c. 25%
d. 50%
![Page 19: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/19.jpg)
ESTIMATIONchoose the correct answer
• 36 is what percent of 40?
a. 90%
b. 48%
c. 25%
d. 73%
![Page 20: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/20.jpg)
ESTIMATIONchoose the correct answer
• 80 is 40% of what number?
a. 80
b. 60
c. 200
d. 160
![Page 21: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/21.jpg)
ESTIMATIONchoose the correct answer
• 65% of what number is 78?
a. 90
b. 42
c. 300
d. 120
![Page 22: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/22.jpg)
Journal
• Explain how you knew the answer on the previous 4 estimation problems.
![Page 23: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/23.jpg)
Workbook section 8-2
• 1st column
![Page 24: 8 2 The Percent Equation](https://reader035.fdocuments.us/reader035/viewer/2022081602/54846501b47959140d8b4bf9/html5/thumbnails/24.jpg)
Homework
• p 342: 7, 8-22 even, 24, 27, 28