There are some skills that you will need to master in order to work with fraction operations:

Before this chapter, you should know how to do the following:

  • Convert fractions to lowest terms
  • Make an equivalent fraction if you know the denominator you want to change the fraction into
  • Find the lowest common denominator between two or more fractions
  • Convert mixed numbers to improper fractions
  • Convert improper fractions to mixed numbers
  • Add or subtract fractions with the same denominator
  • Add or subtract fractions with different denominators

Today we will review some of these pre-requisite skills and get some practice with our review

Resources

  • Notes

Assignment

  • Worksheets
  • Fractions Self Assessment
Attachments:
FileDescriptionFile size
Download this file (8.6.0.review.assignment.pdf)8.6.0.review.assignment.pdfReview Assignment (Self assessment)6 kB
Download this file (8.6.0.review.pdf)8.6.0.review.pdfReview Notes157 kB
Download this file (8.6.0.worksheets.pdf)8.6.0.worksheets.pdfWorksheets for practice523 kB

There are different ways to think of how to multiply a fraction and a whole number:

  • Use a diagram and model how the fractions fit together
  1. Convert the multiplication to repeated addition

PreClass Assignment:

In Class Assignment

  • P202 #5a #6, 7, 8, 9, 10, 11, 12 15, *16 *17

Things you should be able to do after today:

  • Explain what a whole number x a fraction means as a repeated addition statement
  • Multiply a whole number by a fraction and write the answer as an improper fraction or a mixed number
  • Convert a word problem to a math statement using multiplication

Resources

Assignment

  • p208 #4, 5, 6, 7, 8, 9, 10 12

Resources

  1. Watch the Youtube Videos and Copy down the notes.

Assignment

  • P214 #3, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, *16

Things you should be able to do after today:

  • multiply two or more proper fractions and reduce the answer to lowest terms
  • use the cross reducing method to help reduce the multiplication of proper fractions to lowest terms
  • represent a word problem using a diagram and use that diagram to determine a multiplication of proper fractions

Proper fractions make up a very small set of numbers; many times, you will need to multiply mixed numbers or whole numbers.  It is basically the same as multiplying proper fractions with just a couple different steps that are very important:

  1. Convert your mixed numbers or whole numbers to improper fractions
  2. Cross reduce if possible
  3. Multiply your numerators and multiply your denominators
  4. Convert your answer back to a mixed number if necessary.

Resources

  • Notes

Things you should be able to do after today:

  • Convert a mixed number or whole number to an improper fraction
  • Convert an imroper fraction to a mixed number
  • Multiply improper fractions and proper fractions

Assignment:

  • Worksheet examples
  • p220 #10-16
Attachments:
FileDescriptionFile size
Download this file (8.6.4.multiplying.mixed.pdf)8.6.4.multiplying.mixed.pdfWorksheet116 kB
Download this file (8.6.4.notes.pdf)8.6.4.notes.pdfNotes for multiplying mixed numbers335 kB

Dividing fractions is an easy process if you think about changing the division to a multiplication question.  This is because we can make use of the reciprocal.

For example, we often think of dividing by 2 as taking  ½ as taking of something.  2 and ½ are reciprocal numbers.  In today's notes, find out how we can use reciprocals to help us divide by a fraction.

Resources:

  • Notes

Things you should be able to do after today:

  • Find the reciprocal of a fraction
  • Change a division question into a multiplication question using reciprocals
  • Divide using fractions

Assignment

  • Worksheet
  • p227 #7-11, 13, 15, 17, 20 *23
Attachments:
FileDescriptionFile size
Download this file (8.6.5.dividing.ws.pdf)8.6.5.dividing.ws.pdf 192 kB
Download this file (8.6.5.notes.pdf)8.6.5.notes.pdf 532 kB

Fractions are just like regular numbers (decimals and whole numbers), so order of operations also applies when mixing operations with fractions. You need to remember the rules for BEDMAS, but also take special care when doing BEDMAS with fractions, because the rules for multiplying, dividing, adding and subtracting with fractions are sometimes different.

Some things you want to remember:

  • changing all of your mixed numbers to improper fractions is a good idea (because any multiplying or dividing will require improper fractions anyways)
  • adding and subtracting fractions requires common denominators, multiplying and dividing do not
  • cross reducing may only be done when multiplying fractions
  • dividing by a fraction can be changed into multiplying by a reciprocal

Resources:

  • Notes

Assingment:

  • p234 #4-8, 1-12 *15
  • Sea Monster worksheet
Attachments:
FileDescriptionFile size
Download this file (8.6.6.notes.pdf)8.6.6.notes.pdf 862 kB

Things you need to know how to do in this chapter:

  1. How to add/subtract fractions (for the BEDMAS section)
  2. How to make fractions to lowest terms
  3. How to convert improper fractions and mixed numbers
  4. How to multiply fractions
    • With whole numbers
    • Cross reducing
    • With Improper Fractions and mixed numbers
  5. How to divide fractions
    • With whole numbers
    • With improper fractions and mixed numbers
  6. Order of Operations (BEDMAS)
  7. Mixed operations
    • How to show one step per line!
    • How to write an equation from a word problem
  8. Solve problems involving “time and a half”

Assignment:

  • Practice p236 #1-10, 13-17, 19-22, 24, 26
   
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