MJ2A

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MJ2A

• Ch 5.5 Adding Subtracting Like Fractions

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Bellwork

• Divide the following rational numbers. Express
  the product in simplest form.
• 1 ? 1
• 2 10
• -1 ½ ? ¼
• 4k ? 25
• 5 2k

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Before we begin

• Please take out your foldable and get ready to
  work
• Ok...so far we have done multiplying and dividing
  fractions
• As a quick reviewraise your hand if you can tell
  me the rule for dividing and multiplying
  fractions
• Today we will look at adding like fractions
• Raise your hand if you can tell me what a like
  fraction is.

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Objective

• Students will add and subtract like fractions

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Like Fractions

• Fractions are considered alike if the have the
  same denominator.
• You CANNOT add or subtract fractions if they do
  not have a common denominator!

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Adding Subtracting Like Fractions

• The rule If the fractions have a common
  denominator you can add or subtract the fractions
  by adding or subtracting the numerator and
  placing it over the common denominator
• Example
• 1 3 4 1
• 8 8 8 2

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Your Turn

• On your foldable add or subtract the following
• 1 5
• 7 7
• 11 - 3
• 14 14
• 6r 2r
• 11 11

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Adding Subtracting Mixed Numbers

• There are 2 methods to handle adding
  subtracting mixed numbers with like fractions.
• Handle the fractions separately from the whole
  numbers and then add the results together
• Or
• Convert the mixed numbers to improper fractions
  then add or subtract

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Example - Method 1

• 6 5 1 1
• 8 8
• Set up the problem like this
• 6 5
• 8
• 1 1
• 8
• 7 6
• 8

Add the whole numbers
Add the Fractions
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Example Method 2

• 6 5 1 1
• 8 8
• Set up the problem like this
• 6 5 53
• 8 8
• 1 1 9
• 8 8
• 62 7 6
• 8 8

Convert to improper fractions
Convert to improper fractions
Then convert to a mixed number
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Summary

• On your foldable summarize the rule for adding
  and subtracting like fractions

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Assignment

• Text p. 222 223 15 44
• Reminder
• I do not accept late assignment
• I do not accept answers only for any assignment
• This assignment is due tomorrow