Percents

Warm Up

a) Name the Property:

b) Simplify

4323423 xx

Distributive Property

13

5

13

135

13

13

13

5

What is a percent?

25% 25 per hundred

25%

25% 0.25

25

100

Change to a decimal.

1. 8%

2. 15%

3. 312%

4. 4.37%

.08

.15

3.12

.0437

Change to a reduced fraction

1. 12%

2. 8%

3. 125%

4. 60%

25

3

100

12

25

2

100

8

4

5

100

125

5

3

100

60

Change to a percent

1.

2.

3.

0.40 = 40%

0.75 = 75%

0.2857 = 28.57%

2

5

3

4

2

7

Six-sevenths of Ms. Kay’s girl scout troop planned to attend a field hockey game. Approximately what percent of the troop was that?

A. 15%

B. 76%

C. 80%

D. 86%

Answer…..

%86%7.85857.7

6

Four-ninths of the class failed. Approx. what percent was that?

Answer……

%44444.9

4

Solving Proportions

7

15 21

x 5 3

10n

8.9

14715

)21)(7(15

x

x

x

7.16

503

)10)(5(3

n

n

n

You try! Solve the following:

8 2

5m

12

30 5

x

Answers……

20

4025

28

m

mm

2

6030530

12

x

x

x

Setting up proportions for a percent…..

100

p

Of

Is

What percent of 80 is 18?

%5.22

18008010080

18

p

p

p

What percent of 10 is 4?

%40

4001010010

4

p

p

p

What is 12% of 94?

28.11

1128100100

12

94

n

n

n

147 is 14% of what?

1050

1470014100

14147

n

nn

What percent of 1.2 is 6?

%500

6002.11002.1

6

p

p

p

13.2 is 55% of what?

24

132055100

552.13

x

xx

What is 0.4% of 800?

2.3

320100100

4.0

800

x

x

x

What is 75% of 68?

51

5100100100

75

68

n

n

n

5 is 200% of what?

5.2

500200100

2005

x

xx

What percent of 54 is 28?

%85.51

28005410054

28

p

p

p

114 is 95% of what?

120

1140095100

95114

x

xx

What percent of 20 is 31?

%155

31002010020

31

p

p

p

What is 35% of 15?

25.5

525100100

35

15

x

x

x

Homework

Worksheet on Percents