Subtracting fractions with like denominators

Lessons

• Introduction
  How to simplify fractions?
  a)

  Method A: Simplify by using greatest common factors
  
  
  b)

  Method B: Simplify by using common factors
  
  

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• 1.
  Subtracting Fractions With Small Numbers
  Subtract. Then, simplify when possible.
  a)

  $\frac{6}{8}-\frac{7}{8}$
  
  
  b)

  $\frac{10}{11}-\frac{9}{11}$
  
  
  c)

  1 - $\frac{12}{24}$
  
  

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• 2.
  Word Problems: Subtracting Fractions
  Marry is swimming 200m of freestyle at a competition. She still has $\frac{7}{10}$ of the race to go. If she swims $\frac{2}{10}$ more of the race, will she be halfway through? Show your work.

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• 3.
  Teresa and Maggie buy a bag of chips at the store. Teresa eats $\frac{2}{9}$ of the bag and Maggie eats $\frac{5}{9}$ of the bag. How much of the bag is left?

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• 4.
  Subtracting Fractions With Large Numbers
  Subtract. Then, simplify when possible.
  a)

  $\frac{726}{780} - \frac{126}{780}$
  
  
  b)

  $\frac{231}{260} - \frac{84}{260}$
  
  
  c)

  $\frac{129}{693} - ( - \frac{213}{693} )$
  
  
  d)

  $\frac{265}{380} - \frac{78}{380} - \frac{103}{380}$
  
  

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