Do Now 4/28/11Do Now 4/28/11 Take out HW from last Wednesday.Take out HW from last Wednesday.

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

Copy HW in your planner.Copy HW in your planner. Text p. 342, #14-32 evensText p. 342, #14-32 evens Text p. 350, #2-16 evens, 17-21 allText p. 350, #2-16 evens, 17-21 all Quiz sections 7.1-7.3 MondayQuiz sections 7.1-7.3 Monday

In your notebook, convert the following In your notebook, convert the following fractions into decimals. fractions into decimals. 1/81/8 5/45/4 2/9 2/9 3½ 3½

0.125 1.25 0.2 3.5

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

10) 78.4%10) 78.4% 12) 3912) 39 14) 6414) 64 16) 280 grams16) 280 grams 18) 40%18) 40% 20) a). 30 cars20) a). 30 cars

b). 53 1/3%b). 53 1/3%

c). 12 carsc). 12 cars

22) a). 50%, 12 ½%22) a). 50%, 12 ½%

b). 81 8b). 81 8thth graders graders

c). About 234 c). About 234 studentsstudents

26) 126) 1

ObjectiveObjective SWBAT use decimals to solve percent SWBAT use decimals to solve percent

problemsproblems

Percent-Percent- means ‘per one means ‘per one hundred’ or divided by hundred’ or divided by 100. 100. How many cents

are there in a dollar?

Section 7.3 “Percents and Section 7.3 “Percents and DecimalsDecimals

a ratio whose denominator isa ratio whose denominator is

15150.150.1515%15%

100100

OOOO

1515100100

1515OOOO11== ==

PercePercentnt

DecimalDecimalss

PercentsPercents FractionsFractions== ==

Always move the decimal Always move the decimal point point TWOTWO places to the places to the RIGHT and add a % sign!RIGHT and add a % sign!

%%

0.710.71 7711

Writing Decimals as Percents Writing Decimals as Percents

When you move the decimal point two places to the RIGHT, When you move the decimal point two places to the RIGHT, you are really multiplying by 100.you are really multiplying by 100.

%%..00

Replace the % sign with Replace the % sign with a decimal and always a decimal and always move the decimal point move the decimal point TWOTWO places to the LEFT! places to the LEFT!

%%

71%71% 7711

Writing Percents as Decimals Writing Percents as Decimals

When you move the decimal point two places to the LEFT, When you move the decimal point two places to the LEFT, you are really dividing by 100.you are really dividing by 100.

%%..00

0.120.12 12%12%0.240.2455

24.5%24.5%

0.170.17 17%17%0.030.03 3%3%

Writing Decimals as Percents Writing Decimals as Percents

Writing Percents as DecimalsWriting Percents as Decimals

22 200200%%0.0040.004

55 0.45%0.45%

1.71.7 170%170%0.0030.003 0.3%0.3%

Writing Decimals as Percents Writing Decimals as Percents

Writing Percents as DecimalsWriting Percents as Decimals

Writing Fractions as PercentsWriting Fractions as Percents

8

7Rewrite the fraction as a Rewrite the fraction as a decimal.decimal.

8

7This means 7 divided by 8.This means 7 divided by 8.

A fraction is the quotientA fraction is the quotient of two integersof two integers

Remember

87

780

64 6

87

Finished

.00

56 4

05

400.875 = 0.875 = 87.5% 87.5%

Writing Fractions as PercentsWriting Fractions as Percents

12

5Rewrite the fraction as a Rewrite the fraction as a decimal.decimal.

12

5This means 5 divided by 12.This means 5 divided by 12.

A fraction is the quotientA fraction is the quotient of two integersof two integers

Remember

125

5120

48 2

41

Repeating decimal

.00

12 8

06

72

0.416 = 0.416 = 41.6% 41.6% 8

Finding Percent Finding Percent ofof a a NumberNumber

““OF”OF” means multiplicationmeans multiplication

10.5%10.5% 0.1050.105Find 10.5% of 5600.Find 10.5% of 5600.

5600105.0 588

120%120% 1.21.2Find 120% of 400.Find 120% of 400.

4002.1 480

Quiz MondayQuiz Monday

Percent-Percent- means ‘per one means ‘per one hundred’ or divided by hundred’ or divided by 100. 100.

How many cents are there in a dollar?

Section 7.1, “Percents and Section 7.1, “Percents and Fractions” Fractions”

PercentPercenta ratio whose denominator isa ratio whose denominator is

1515

15%15%

100100OO

OO

1515100100

1515OOOO11

==

Writing Percents as Writing Percents as FractionsFractions

29%29% 29 out 29 out of 100of 100

2929100100

90%90% 90 out 90 out of 100of 100

9090100100

== 99 1010

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

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

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 the number that is compared to the base.base. will equal the percent. will equal the percent.

100

p

100

p

b

a

Section 7.3 “Percents and Section 7.3 “Percents and DecimalsDecimals

a ratio whose denominator isa ratio whose denominator is

15150.150.1515%15%

100100

OOOO

1515100100

1515OOOO11== ==

PercenPercentt

DecimalDecimalss

PercentsPercents FractionsFractions== ==

HomeworkHomework Text p. 342, #14-32 evensText p. 342, #14-32 evens Text p. 350, #2-16 evens, 17-21 allText p. 350, #2-16 evens, 17-21 all