Post on 18-Jan-2016
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 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
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%
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
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