Transcript MJ3 - Davidsen Middle School

MJ3
Ch 5.3 – Percent Proportion
Bellwork

1.
2.
3.
Solve each proportion:
5 = x
6
24
a = 2
12
15
2 = 5
7
t
Assignment Review


Text p. 213 # 17 – 54
If you did not hand this assignment in
yesterday….please do so today
Notice

Interim Reports will be distributed on Tuesday
November 27th!
Before we begin….



Please take out your notebook and get ready
to work…
Continuing with the chapter theme of
percents…today we will look at the percent
proportion…
The percent proportion is used to determine
what percent a number is of another
number…
Objective

Students will solve problems using the
percent proportion
Parts of the percent proportion
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In order to effectively use the percent
proportion you must know the parts of the
proportion and what they represent…
So…let’s look at an example
Example

22 is what percent of 110?
Percent proportion:
In words:
part =
percent
base
100
In numbers
22 =
P
110
100
After you set up the proportion, cross multiply
and solve algebraically…
Using the percent proportion
The percent proportion can be used to find the base,
part, or percent of a number
 Examples of what that looks like
To find the percent you might have a problem like this
7 is what percent of 10?
To find the part you might have a problem like this
What number is 70% of 10?
To find the base you might have a problem like this
7 is 70% of what number?

Your Turn

In the notes section of your notebook write
and solve the following:
1.
70 is what percent of 280?
150 is 60% of what number?
What is 72.5% of 200?
2.
3.
Summary
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
In the notes section of your notebook
summarize the key concepts covered in
today’s lesson
Today we discussed:



The percent proportion
How do you set it up?
How do you solve it?
Assignment

Text p. 218 # 10 – 25

This assignment is due today before you leave the
classroom.