Do Now 4/14/10
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Take out HW from last night.
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Text p. 337, #10-22 even, & #26
Copy HW in your planner.
Text p. 342, #14-60 evens
 Mid-Chapter 7 Quiz (Sections 7.1-7.4) Monday
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In your journal, convert the following fractions into
decimals.
1/8
0.125
5/4
2/9
3½
1.25
0.2
3.5
Homework
Text p. 337, #10-22 even, & #26
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10) 78.4%
12) 39
14) 64
16) 280 grams
18) 40%
20) a). 30 cars
b). 53 1/3%
c). 12 cars
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22) a). 50%, 12 ½%
b). 81 8th graders
c). About 234 students
26) 1
Objective
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SWBAT use decimals to solve percent problems
Percentmeans ‘per one hundred’ or
divided by 100.
How many cents
are there in a dollar?
Section 7.3 “Percents and Decimals
Percent
a ratio whose denominator is
15
O
O
15% =
Percents
100
15
100
= 0.15
= Fractions = Decimals
Writing Decimals as Percents
%
Always move the decimal point
TWO places to the RIGHT and
add a % sign!
0.71
0.71%
When you move the decimal point two places to the RIGHT,
you are really multiplying by 100.
Writing Percents as Decimals
%
Replace the % sign with a
decimal and always move the
decimal point TWO places to the
LEFT!
71%
0 71%
.
When you move the decimal point two places to the LEFT,
you are really dividing by 100.
Writing Decimals as Percents
0.12
0.245
12%
24.5%
Writing Percents as Decimals
17%
3%
0.17
0.03
Writing Decimals as Percents
2
0.0045
200%
0.45%
Writing Percents as Decimals
170%
0.3%
1.7
0.003
Writing Fractions as Percents
1
Write the fraction
as a decimal
8
and percent.
A fraction is the quotient
of two integers
This means 1 divided by 8.
1
8
1 8
0.125 = 12.5%
0 12 5
8 1 .0 0
8
2
16
4
40
Finished
Writing Fractions as Percents
7
Rewrite the fraction
as a decimal.
8
A fraction is the quotient
of two integers
This means 7 divided by 8.
7
8
7 8
0.875 = 87.5%
0 87 5
8 7 .0 0
64
6
56
4
40
Finished
Writing Fractions as Percents
0 41 6
12 5 .0 0
48
A fraction is the quotient
of two integers
2
12
This means 5 divided by 12.
8
5 5 12
72
12
8
0.416 = 41.6% Repeating decimal
5
Rewrite the fraction
as a decimal.
12
Finding Percent of a Number
“OF”
means multiplication
Find 10.5% of 5600.
10.5%
0.105
0.105  5600  588
Find 3.8% of 45.
3.8%
0.038
0.038 45  1.71
Find 120% of 400.
120%
1.2
1.2  400  480
Homework
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Text p. 342, #14-60 evens