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This module is from Fundamentals of Mathematics by Denny Burzynski and Wade Ellis, Jr. This module discusses combinations of operations with decimals and fractions. By the end of the module students should be able to combine operations with decimals.

Having considered operations with decimals and fractions, we now consider opera­tions that involve both decimals and fractions.

Sample set a

Perform the following operations.

0 . 38 1 4 size 12{0 "." "38" cdot { {1} over {4} } } {} . Convert both numbers to decimals or both numbers to fractions. We’ll convert to decimals.

.25 4 1.00   8   ̲ 20 20 ̲ 0
To convert 1 4 size 12{ { {1} over {4} } } {} to a decimal, divide 1 by 4.

Now multiply 0.38 and .25.

.3 4 1 8 × .25 ̲ 190 76    ̲ .0950

Thus, 0 . 38 1 4 = 0 . 095 size 12{0 "." "38" cdot { {1} over {4} } =0 "." "095"} {} .

In the problems that follow, the conversions from fraction to decimal, or decimal to fraction, and some of the additions, subtraction, multiplications, and divisions will be left to you.

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1 . 85 + 3 8 4 . 1 size 12{1 "." "85"+ { {3} over {8} } cdot 4 "." 1} {} Convert 3 8 size 12{ { {3} over {8} } } {} to a decimal.

1 . 85 + 0 . 375 4 . 1 size 12{1 "." "85"+0 "." "375" cdot 4 "." 1} {} Multiply before adding.

1 . 85 + 1 . 5375 size 12{1 "." "85"+1 "." "5375"} {} Now add.

3.3875

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5 13 4 5 0 . 28 size 12{ { {5} over {"13"} } left ( { {4} over {5} } -0 "." "28" right )} {} Convert 0.28 to a fraction.

5 13 4 5 28 100 = 5 13 4 5 7 25 = 5 13 20 25 7 25 = 5 1 13 1 13 1 25 5 = 1 5

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0.125 1 1 3 + 1 16 - 0.1211 = 125 1000 4 3 + 1 16 - 0.1211 = 1 8 4 3 + 1 16 - 0.1211 = 1 8 3 4 + 1 16 - 0.1211 = 3 32 + 1 16 - 0.1211 = 3 32 + 2 32 - 0.1211 = 5 32 - 0.1211 = 0.15625 - 0.1211 = 0.03515 Convert this to fraction form = 3515 100,000 = 703 20,000

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Practice set a

Perform the following operations.

3 5 + 1 . 6 size 12{ { {3} over {5} } +1 "." 6} {}

2.2 or 2 1 5 size 12{2 { {1} over {5} } } {}

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8 . 91 + 1 5 1 . 6 size 12{8 "." "91"+ { {1} over {5} } cdot 1 "." 6} {}

9.23

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1 9 16 6 . 12 + 7 25 size 12{1 { {9} over {"16"} } left (6 "." "12"+ { {7} over {"25"} } right )} {}

10

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0 . 156 1 11 15 0 . 05 size 12{ { {0 "." "156"} over {1 { {"11"} over {"15"} } } } -0 "." "05"} {}

1 25 or   0 . 04 size 12{ { {1} over {"25"} } " or "0 "." "04"} {}

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Exercises

3 10 + 0 . 7 size 12{ { {3} over {"10"} } +0 "." 7} {}

1

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1 5 + 0 . 1 size 12{ { {1} over {5} } +0 "." 1} {}

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5 8 0 . 513 size 12{ { {5} over {8} } -0 "." "513"} {}

0.112

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0 . 418 67 200 size 12{0 "." "418"- { {"67"} over {"200"} } } {}

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0 . 22 1 4 size 12{0 "." "22" cdot { {1} over {4} } } {}

0.055

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3 5 8 . 4 size 12{ { {3} over {5} } cdot 8 "." 4} {}

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1 25 3 . 19 size 12{ { {1} over {"25"} } cdot 3 "." "19"} {}

0.1276

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3 20 ÷  0 . 05 size 12{ { {3} over {"20"} } ÷0 "." "05"} {}

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7 40 ÷  0 . 25 size 12{ { {7} over {"40"} } ÷0 "." "25"} {}

0.7

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1 1 15 ÷  0 . 9 0 . 12 size 12{1 { {1} over {"15"} } ÷0 "." 9 cdot 0 "." "12"} {}

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9 . 26 + 1 4 0 . 81 size 12{9 "." "26"+ { {1} over {4} } cdot 0 "." "81"} {}

9.4625

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0 . 588 + 1 40 0 . 24 size 12{0 "." "588"+ { {1} over {"40"} } cdot 0 "." "24"} {}

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1 20 + 3 . 62 3 8 size 12{ { {1} over {"20"} } +3 "." "62" cdot { {3} over {8} } } {}

1.4075

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7 + 0 . 15 ÷  3 30 size 12{7+0 "." "15"÷ { {3} over {"30"} } } {}

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15 16 7 10 0 . 5 size 12{ { {"15"} over {"16"} } cdot left ( { {7} over {"10"} } -0 "." 5 right )} {}

0.1875

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0 . 2 7 20 + 1 . 1143 size 12{0 "." 2 cdot left ( { {7} over {"20"} } +1 "." "1143" right )} {}

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3 4 0 . 875 + 1 8 size 12{ { {3} over {4} } cdot left (0 "." "875"+ { {1} over {8} } right )} {}

0.75

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5 . 198 0 . 26 14 250 + 0 . 119 size 12{5 "." "198"-0 "." "26" cdot left ( { {"14"} over {"250"} } +0 "." "119" right )} {}

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0 . 5 1 4 + 0 . 3 2 size 12{0 "." 5 { {1} over {4} } + left (0 "." 3 right ) rSup { size 8{2} } } {}

0.615

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1 . 4 2 1 . 6 1 2 size 12{ left (1 "." 4 right ) rSup { size 8{2} } -1 "." 6 { {1} over {2} } } {}

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3 8 2 0 . 000625 + ( 1 . 1 ) 2 size 12{ left ( { {3} over {8} } right ) rSup { size 8{2} } -0 "." "000625"+ \( 1 "." 1 \) rSup { size 8{2} } } {}

1.35

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0 . 6 2 1 20 1 25 size 12{ left (0 "." 6 right ) rSup { size 8{2} } cdot left ( { {1} over {"20"} } - { {1} over {"25"} } right )} {}

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1 2 2 0 . 125 size 12{ left ( { {1} over {2} } right ) rSup { size 8{2} } -0 "." "125"} {}

0.125

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0 . 75 4 1 2 + 5 12 size 12{ { {0 "." "75"} over {4 { {1} over {2} } } } + { {5} over {"12"} } } {}

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0 . 375 2 1 16 1 33 size 12{ left ( { {0 "." "375"} over {2 { {1} over {"16"} } } } - { {1} over {"33"} } right )} {}

0 . 15 ¯ size 12{0 "." {overline {"15"}} } {}

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8 1 3 1 1 4 2 . 25 + 9 25 size 12{8 { {1} over {3} } cdot left ( { {1 { {1} over {4} } } over {2 "." "25"} } + { {9} over {"25"} } right )} {}

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0 . 32 12 35 0 . 35 size 12{ { { { {0 "." "32"} over { { {"12"} over {"35"} } } } } over {0 "." "35"} } } {}

2 . 6 ¯ size 12{2 "." {overline {6}} } {}

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Exercises for review

( [link] ) Is 21,480 divisible by 3?

yes

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( [link] ) Expand 14 4 . Do not find the actual value.

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( [link] ) Find the prime factorization of 15,400.

2 3 5 2 7 11

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( [link] ) Convert 8.016 to a fraction.

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( [link] ) Find the quotient. 16 ÷ 27 size 12{"16 " div "27"} {} .

0 . 592 ¯ size 12{0 "." {overline {"592"}} } {}

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Questions & Answers

what is the stm
Brian Reply
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
7hours 36 min - 4hours 50 min
Tanis Reply

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Source:  OpenStax, Fundamentals of mathematics. OpenStax CNX. Aug 18, 2010 Download for free at http://cnx.org/content/col10615/1.4
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