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Subtract: 1 3 4 6 7 8 .

41 8

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Subtract: 10 3 7 22 4 9 .

757 63

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Key concepts

  • Add mixed numbers with a common denominator.
    1. Add the whole numbers.
    2. Add the fractions.
    3. Simplify, if possible.
  • Subtract mixed numbers with common denominators.
    1. Rewrite the problem in vertical form.
    2. Compare the two fractions.
      If the top fraction is larger than the bottom fraction, go to Step 3.
      If not, in the top mixed number, take one whole and add it to the fraction part, making a mixed number with an improper fraction.
    3. Subtract the fractions.
    4. Subtract the whole numbers.
    5. Simplify, if possible.
  • Subtract mixed numbers with common denominators as improper fractions.
    1. Rewrite the mixed numbers as improper fractions.
    2. Subtract the numerators.
    3. Write the answer as a mixed number, simplifying the fraction part, if possible.

Practice makes perfect

Model Addition of Mixed Numbers

In the following exercises, use a model to find the sum. Draw a picture to illustrate your model.

Add Mixed Numbers with a Common Denominator

In the following exercises, add.

Model Subtraction of Mixed Numbers

In the following exercises, use a model to find the difference. Draw a picture to illustrate your model.

Subtract Mixed Numbers with a Common Denominator

In the following exercises, find the difference.

19 13 15 13 7 15

6 2 5

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Add and Subtract Mixed Numbers with Different Denominators

In the following exercises, write the sum or difference as a mixed number in simplified form.

2 7 8 4 1 3

−1 11 24

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Mixed Practice

In the following exercises, perform the indicated operation and write the result as a mixed number in simplified form.

Everyday math

Sewing Renata is sewing matching shirts for her husband and son. According to the patterns she will use, she needs 2 3 8 yards of fabric for her husband’s shirt and 1 1 8 yards of fabric for her son’s shirt. How much fabric does she need to make both shirts?

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Sewing Pauline has 3 1 4 yards of fabric to make a jacket. The jacket uses 2 2 3 yards. How much fabric will she have left after making the jacket?

7 12 yards

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Printing Nishant is printing invitations on his computer. The paper is 8 1 2 inches wide, and he sets the print area to have a 1 1 2 -inch border on each side. How wide is the print area on the sheet of paper?

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Framing a picture Tessa bought a picture frame for her son’s graduation picture. The picture is 8 inches wide. The picture frame is 2 5 8 inches wide on each side. How wide will the framed picture be?

13 1 4 inches

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Writing exercises

Draw a diagram and use it to explain how to add 1 5 8 + 2 7 8 .

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Edgar will have to pay $3.75 in tolls to drive to the city.

Explain how he can make change from a $10 bill before he leaves so that he has the exact amount he needs.

How is Edgar’s situation similar to how you subtract 10 3 3 4 ?

Answers will vary.

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Add 4 5 12 + 3 7 8 twice, first by leaving them as mixed numbers and then by rewriting as improper fractions. Which method do you prefer, and why?

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Subtract 3 7 8 4 5 12 twice, first by leaving them as mixed numbers and then by rewriting as improper fractions. Which method do you prefer, and why?

Answers will vary.

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

.

After reviewing this checklist, what will you do to become confident for all objectives?

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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