Do Now 4/13/10Do Now 4/13/10 Take out HW from last night.Take out HW from last night.

Text p. 331, #8-56 multiples of 4Text p. 331, #8-56 multiples of 4

Copy HW in your planner.Copy HW in your planner. Text p. 337, #10-22 even, & #26Text p. 337, #10-22 even, & #26

In your journal, solve the following problems. In your journal, solve the following problems. Find 20% of 90.Find 20% of 90. Find 80% of 30.Find 80% of 30. You and three friends go out to dinner and when the bill You and three friends go out to dinner and when the bill

comes the total is $45, not including the tip. If you want comes the total is $45, not including the tip. If you want to leave a 20% tip, how much money should you leave to leave a 20% tip, how much money should you leave for the waitress.for the waitress.

18

$9.00

24

HomeworkHomework Text p. 331, #8-56 multiples of 4 Text p. 331, #8-56 multiples of 4

8) 17/508) 17/50 12) 11/2012) 11/20 16) 80%16) 80% 20) 66%20) 66% 24) 1/1024) 1/10 28) 10%28) 10% 32) 50%32) 50%

36) 1936) 19 40) 1340) 13 44) 36 min44) 36 min 48) 17%, 9/50, 0.22, 48) 17%, 9/50, 0.22,

9/259/25 52) 752) 7 56) 10%56) 10%

ObjectiveObjective SWBAT use proportions to solve percent SWBAT use proportions to solve percent

problemsproblems

Percent-Percent- means ‘per one hundred’ means ‘per one hundred’

or divided by 100. or divided by 100. How many cents are there in a dollar?

Section 7.2 “Percents and Section 7.2 “Percents and Proportions”Proportions”

You can represent You can represent “a“a is is pp percent percent of of bb” using the proportion” using the proportion

100)(

)( p

ofb

isa

In this equation, In this equation, bb is the is the whole numberwhole number and and aa is the is the number that is compared to number that is compared to the base.the base. will equal the percent. will equal the percent.

100

p

100

p

b

a

Try It Out…Try It Out…

2.13a

What number is 15% of 88?What number is 15% of 88?Write a proportion where Write a proportion where 15%15% is the is the percent and percent and 8888 is the base. is the base.

13.2 is 15% of 8813.2 is 15% of 88

100

p

b

a

100

15

88

a

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply

a1001320

Try It Out…Try It Out…

2.60a

What number is 20% of 301?What number is 20% of 301?Write a proportion where Write a proportion where 2020%% is the is the percent and percent and 301301 is the base. is the base.

60.2 is 20% of 30160.2 is 20% of 301

100

p

b

a

100

20

301

a

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply

a1006020

Try It Out…Try It Out…

p68

What percent of 25 is 17?What percent of 25 is 17?Write a proportion where Write a proportion where 2525 is the is the base and base and 1717 is a part of the base. is a part of the base.

100

p

b

a

10025

17 p

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply p251700

17 is 68% of 2517 is 68% of 25

Try It Out…Try It Out…

p5.37

What percent of 136 is 51?What percent of 136 is 51?Write a proportion where Write a proportion where 136136 is the is the base and base and 5151 is a part of the base. is a part of the base.

100

p

b

a

100136

51 p

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply p1365100

51 is 37.5% of 13651 is 37.5% of 136

Try It Out…Try It Out…

160b

100

p

b

a

100

5.1220

b

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply

b5.122000

20 is 12.5% of what number?20 is 12.5% of what number?Use an equation where Use an equation where 12.5%12.5% is the is the percent and percent and 2020 is a part of the base. is a part of the base.

20 is 12.5% of 16020 is 12.5% of 160

Try It Out…Try It Out…

12b

100

p

b

a

100

25030

b

Percent proportionPercent proportion

Substitute and Substitute and then cross multiplythen cross multiply

b2503000

30 is 250% of what number?30 is 250% of what number?Use an equation where Use an equation where 250%250% is the is the percent and percent and 3030 is a part of the base. is a part of the base.

30 is 250% of 1230 is 250% of 12

Word ProblemWord Problem A survey of people who suffered injuries at A survey of people who suffered injuries at

home found that 32% of all accidents home found that 32% of all accidents involved falls. If 80 accidents involved involved falls. If 80 accidents involved falls, how many accidents were there? falls, how many accidents were there?

I’ve fallin’ I’ve fallin’ and I and I

can’t get can’t get up!!up!!

250b100

p

b

a

100

3280

b

b328000

80 is 32% of 25080 is 32% of 250

Ms. Cleveland

Word ProblemWord Problem Of the 325 teams in the NCAA Division 1 Of the 325 teams in the NCAA Division 1

Women’s Basketball, 4% are in the Mid-Women’s Basketball, 4% are in the Mid-American Conference (MAC). How many American Conference (MAC). How many teams are in the MAC? teams are in the MAC?

13a100

p

b

a

100

4

325

a

a1001300

13 is 4% of 32513 is 4% of 325

What Have We Learned… What Have We Learned…

Types of Percent Problems

(1) Find a percent What percent of 136 is 51?

(2) Find a part of a base What number is 15% of 88?

(3) Find a base 20 is 12.5% of what number?

HomeworkHomework

NJASK7 PrepNJASK7 Prep

Text p. 337, #10-22 even, & #26Text p. 337, #10-22 even, & #26