Do Now 3/31/11 Take out HW from last night. Take out HW from last night. Text p. 337, #10-22 even, & #26 Text p. 337, #10-22 even, & #26 Copy HW in your

Do Now 3/31/11Do Now 3/31/11 Take out HW from last night.Take out HW from last night.

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, #14-60 evensText p. 342, #14-60 evens Mid-Chapter 7 Quiz (Sections 7.1-7.4) Mid-Chapter 7 Quiz (Sections 7.1-7.4)

TuesdayTuesday

In your journal, convert the following In your journal, 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 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 Percents as DecimalsWriting Percents as Decimals

Writing Fractions as PercentsWriting Fractions as Percents

8

1Write the fraction as a decimal Write the fraction as a decimal and percent.and percent.

8

1This means 1 divided by 8.This means 1 divided by 8.

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

Remember

81

118800

88 22

1122

FinishedFinished

..0000

1616 44

0055

40400.125 = 0.125 = 12.5% 12.5%


8

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

8



Remember

87

780

64 6

87

Finished

.00

56 4

05

400.875 = 0.875 = 87.5% 87.5%


12

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

12



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

3.8%3.8% 0.0380.038Find 3.8% of 45.Find 3.8% of 45.

45038.0 71.1

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

4002.1 480

HomeworkHomework

Text p. 342, #14-60 evensText p. 342, #14-60 evens

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Do Now 3/31/11 Take out HW from last night. Take out HW from last night. Text p. 337, #10-22 even, & #26 Text p. 337, #10-22 even, & #26 Copy HW in your