Download - 7.3.1 finding the part
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Lesson 7.3, For use with pages 354-358
ANSWER 14 ANSWER 42
1. x35 = 16
402. 24
x = 3256
Solve the proportion.
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Math homework for the week of Nov. 14-18
Monday: 7.3 Finding the part. Homework– worksheet 59B-60 all.
Tuesday: 7.3 Finding the percent. Homework– worksheet 61B-62 all.
Wednesday: 7.3 Finding the total/base. Homework– worksheet 61B-62 all.
Thursday: Review. Homework– worksheet 65B-66 all.
Friday: Quiz over ratios, proportions and the three types of percent problems.
(Proportion quiz corrections due.)
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Finding the PARTFinding the PART(that represents the percent)(that represents the percent)
Section 7.3Section 7.3
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Essential Questions
Where are different situations percents are used in real life?
As a consumer, why is it important for you to know about percents?
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There are three different types of percent problems. Today we will be looking only one of these types – finding the part (or sometimes called the percentage).
part %
(of) total 100Notice: the percent always goes over 100.
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Some should be easy enough to do mentally. Others you will need to use a proportion.
Can you do these in your head?
25% of 16 is_____ 50% of 60 is_____
75% of 12 is_____ 33 1/3% of 21 is____
100% of 17 is_____ 40% of 20 is_____
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Some should be easy enough to do mentally. Others you will need to use a proportion.
Can you do these in your head?
25% of 16 is_____ 50% of 60 is_____
75% of 12 is_____ 33 1/3% of 21 is____
100% of 17 is_____ 40% of 20 is_____ 8
30
9 7
17
4
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part (is) % total (of) 100
8% of 50 is what number?
a 50 = 8
100
a = 4
100a 8( 50)=
100a 400=
100 100
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part (is) % total (of) 100
What number is 25% of 36?
a 36 = 25
100
a = 9
100a 25( 36)=
100a 900=
100 100
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part (is) % total (of) 100
______ is 40% of 25.
a 25 = 40
100
a = 10
100a 40( 25)=
100a 1,000=
100 100
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EXAMPLE 2 Finding Part of a Base
School Newspaper
Your school newspaper’s budget this year is 160% of last year’s budget, which was $2125. What is this year’s budget?SOLUTION
a2125 = 160
100
a = 3400
100a 2125( 160)=
100a 340,000=
100 100
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A waiter may receive 15% of the bill for a tip. If your bill is $28.45. what would be an appropriate amount to leave for a tip?
x28.45
= 15
100
100x 15( 28.45)=
100x 426.75=100 100
x = $4.27
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65% of the students at LCMS agreed they did not study prior to tests. If there are 700 students in the building, how many students do not study prior to a test?
How many “do” study?
a700 = 65
100
a = 455
100a 65( 700)=
100a 45,500=
100 100
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65% of the customers bought at least one item that was on sale in the store. How many bought an item “on sale”?
= 65
100
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Water makes up about 95% of the weight of a watermelon. How many pounds of a 12-pound watermelon is NOT water?
a 12 = 5
100
a = 0.6
100a 5( 12)=
100a 60=
100 100
a12 = 95
100
a = 11.4
100a 12( 95)=
100a 1140=
100 100
12 – 11.4 = 0.6
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Homework
Worksheet 59-60
– Page 59: Do column B
– Page 60: All
– You MUST show a PROPORTION for EVERY problem.