Transcript Percent

Finding a Percent of a
Number
SPI 0606.2.6
Solve problems involving
ratios, rates and
percents.
Definition of Percent

Percent can be defined as a
ratio that compares a number to
100 or “per one hundred.”
per
100
Percents Have Equivalents in
Decimals and Fractions
per
100
Do you know how to write
20% as a fraction and as a
decimal
20 % Means
20 parts out of 100 or 20 hundredths.
1
11
21
31
41
51
61
71
81
91
2
12
22
32
42
52
62
72
82
92
3
13
23
33
43
53
63
73
83
93
4
14
24
34
44
54
64
74
84
94
5
15
25
35
45
55
65
75
85
95
6
16
26
36
46
56
66
76
86
96
7
17
27
37
47
57
67
77
87
97
8
18
28
38
48
58
68
78
88
98
9
19
29
39
49
59
69
79
89
99
10
20
30
40
50
60
70
80
90
100
Percents Have Equivalents in
Decimals and Fractions
Percent
Fraction
Decimal Fraction Simplified
1
20
20% = .20 = 100 = 5
Copy the following slides
into your notebook, while
your teacher reads them
aloud to you!
How to Find the Percent of
a Whole Number

The first thing to remember is “of”
means multiply in mathematics.
of = x
How to Find the Percent of
a Whole Number

Step 1 - When you see a percent
problem you know when you read
“of” in the problem you multiply.
25% of
x 200
How to Find the Percent of a
Whole Number
 Step 2 – Change your percent to a
decimal and then move it two places
to the left.
. 25%
. x 200
How to Find the Percent of a
Whole Number
 Step 3 – Multiply just like a regular
decimal multiplication problem.
200
x .25
1000
+400
5000
How to Find the Percent of a
Whole Number
 Step 4 – Place the decimal point 2
places to the left in your answer.
200
x .25
1000
+400
5000
.
What is the percent of this number?
.20 .% of
x 820
820
x .20
000
+1640
16400
.
Your Turn !
See if you can solve the
following problems and
then check your answers
What is the percent of this number?
x2 725
.40 .% 1of
725
x .40
000
+2900
29000
.
What is the percent of this number?
x1 692
.60 .% 5of
692
x .60
000
+4152
21520
.
Let’s see how we will do
with a word problem
On Saturday, Alma made 70%
of the sales at a store where
she works. The total amount of
sales at the store on Saturday
was $910. What was Alma’s
total amount of sales on
Saturday?
What is the percent of this number?
910
x .70
000
+6370
63700
.
Outstanding Work!
Your teacher will provide
you with a worksheet that
includes additional
problems for you to solve