Estimating Percents
[h1]{PAGETITLE}[/h1]
Learning Objective
Students will be able to estimate a percent of a quantity, given an application.
Students will be able to estimate a percent of a quantity, given an application.
Learning Objective
Vocabulary
Percent - A ratio that compares a number to 100.
Example: 76 out of 100 is 76 percent or 76%.
Estimation - A way to find an approximate answer instead of an exact one
[b]Percent[/b] - A ratio that compares a number to 100.
[i][u]Example:[/u][/i] 76 out of 100 is 76 percent or 76%.
[b]Estimation[/b] - A way to find an approximate answer instead of an exact one
Vocabulary
Problem of the Day
Mateo was asked to find 140% of 80 on a multiple choice test. The answers he had to choose from are shown below.
a. 11.3
b. 60
c. 96
d. 112
Without doing any computations, Mateo said he could immediately eliminate two of the answer choices. How do you think he was able to do this?
Mateo was asked to find 140% of 80 on a multiple choice test. The answers he had to choose from are shown below.
[b]a.[/b] 11.3
[b]b.[/b] 60
[b]c.[/b] 96
[b]d.[/b] 112
Without doing any computations, Mateo said he could immediately eliminate two of the answer choices. How do you think he was able to do this?
Problem of the Day
Mini-Lesson
In previous courses, you have used percents to represent parts of a whole. You should remember that percent is a ratio that compares a number to 100.
In this lesson, you will build on that knowledge to estimate and calculate percents involving real-world situations. Understanding percents can help you quickly estimate the percent of something, such as a tip in a restaurant or the price of a sale item.
Real-Life Math, Page 110
Percents are used to describe many situations, including athletic performances by both individuals and teams.
Think About It
1. What is a team's winning percentage when the team's wins equal the team's losses?
2. What would it mean if a team's winning percentage was 0%?
3. What would it mean if a team's winning percentage was 100%?
4. Suppose that the football team played ten games instead of eight. If they had won five of the games in Year 1, would the percent shown in the table (P. 110) need to be changed? Explain.
Benchmark Percents
1%, 10%, 25%, 50%, 75%, 100%
In previous courses, you have used percents to represent parts of a whole. You should remember that percent is a ratio that compares a number to 100.
In this lesson, you will build on that knowledge to estimate and calculate percents involving real-world situations. Understanding percents can help you quickly estimate the percent of something, such as a tip in a restaurant or the price of a sale item.
[h1]Real-Life Math, Page 110[/h1]
Percents are used to describe many situations, including athletic performances by both individuals and teams.
[b]Think About It[/b]
1. What is a team's winning percentage when the team's wins equal the team's losses?
2. What would it mean if a team's winning percentage was 0%?
3. What would it mean if a team's winning percentage was 100%?
4. Suppose that the football team played ten games instead of eight. If they had won five of the games in Year 1, would the percent shown in the table (P. 110) need to be changed? Explain.
[h1]Benchmark Percents[/h1]
1%, 10%, 25%, 50%, 75%, 100%
Mini-Lesson
Journal Entry #1
I need to remember the following about estimating percents:
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I need to remember the following about estimating percents:
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Journal Entry #1
[http://glencoe.com/ose/]
[i]Pages 112-115[/i]
Textbook
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Unit Introduction 