Converting Decimals Percent

1
Converting Decimals Percent Fractions

• By Mrs. Nighs

2
Changing a Decimal to a Percentage

• Move decimal two spaces to the right.
• .25 .355 .8

3
Changing Percentage to a Decimal

• Move two spaces to the left.
• 25 12.5 5

4
Change a Decimal to a Fraction

• Say the name
• .2 .3 .45
  .125

5
Change Percentage to a Fraction

• Percent means per-hundred. Think of pennies How
  many pennies in one dollar?
• So make the denominator 100
• 25 17 8
  125

6
Change Fractions to Percentages and Decimals

• By Mrs. Nighs

7
How to Change Fractions to a Decimal then a
Percentage

• Step 1 - Divide the denominator into the
  numerator.

Stop! You cant divide a larger number into a
smaller number!
8
How to Change Fractions to Percents

• Step 1 - Divide the denominator into the
  numerator.

Sure you can if you use decimals. Just watch!
9
How to Change Fractions to Percents

• Step 2 Add a decimal behind your dividend and
  two zeros.

Now does it look like you can divide?
4)
3
.00
10
How to Change Fractions to Percents

• Step 3 Place a decimal in your quotient
  exactly above the decimal.

Putting the decimal in the right spot is
important.
.
4)
3
.00
11
How to Change Fractions to Percents

• Step 4 Divide exactly like you would with long
  division.

.
Great job!
7
5
4)
3
.00
2 8
2
0
2
0
12
How to Change Fractions to Percents

• Step 5 Move the decimal 2 places to the right
  and change the decimal to a percent sign.

Now wasnt that easy!
.
7
5


13
Change this fraction to a percent
The first step is to divide the denominator into
the numerator.
1
5)
1
5
14
Change this fraction to a percent
The second step is to add a decimal 2 zeros
after the dividend.
1
5)
1
.00
5
15
Change this fraction to a percent
The third step is to place the decimal in the
quotient directly above the decimal.
.
1
5)
1
.00
5
16
Change this fraction to a percent
.
2
0
1
5)
1
.00
The fourth step is to divide using long division.
5
1
0
0
0
0
0
0
17
Change this fraction to a percent
The fifth step is to move the decimal point 2
places to the right and change it to a percent
sign.
.
2
0

1
5)
1
.00
5
1
0
0
0
0
0
0
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Memorize These Equivalents
1
2
50
66.6


2
3
1
1
25
20


4
5
3
2
75
40


4
5
33.3
1
3
60


3
5
19
What is the equivalent percent?
1

50
2
20
What is the equivalent percent?
1

25
4
21
What is the equivalent percent?
3

75
4
22
What is the equivalent percent?
1

33.3
3
23
What is the equivalent percent?
2

66.6
3
24
What is the equivalent percent?
1

20
5
25
What is the equivalent percent?
2

40
5
26
What is the equivalent percent?
3

60
5
27
What is the equivalent percent?
4

80
5
28
Whiteboard Activity

• This is an informal assessment teachers use to
  gauge students understanding.
• Please do not look around for the answer. Solve
  it on your own.
• Hold board up until I acknowledge it is correct.
• Wait for next question.

29
Question 1

• Give me the percentage for 0.35?

30
Question 2
Is what percent?
3
5
31
Question 3
Write as a Decimal.
1
4
32
Question 4

• Write 0.8 as a fraction.

33
Question 5

• Write 20 as a decimal.

34
Question 6

• Write 125 as a decimal.

35
Question 7

• Write .35 as a fraction.

36
Question 8

• Write .125 as a fraction.

37
Question 9

• Give me 6 prime numbers.

38
Question 10

• When do you take the Math CAHSEE Test?

39
Complete Class workandPrepare for Quiz