Adding fractions with like denominators

Lessons

• Introduction
  a)

  Simplify fractions: Method A - By using greatest common factors
  
  
  b)

  Simplify fractions: Method B - By using common factors
  
  
  c)

  How to add fractions?
  
  

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• 1.
  Adding One-digit Fractions
  Add. Then, simplify when possible.
  a)

  $\frac{2}{5}+\frac{3}{5}$
  
  
  b)

  $\frac{3}{4}+\frac{2}{4}$
  
  
  c)

  $\frac{2}{9}+\frac{1}{9}$
  
  

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• 2.
  Word Problems Involving One-digit Fractions
  Laura and Mary are making bread for their grandchildren. They have one bag of flour. Laura needs $\frac{2}{4}$ of the bag and Mary needs $\frac{3}{4}$ of the bag. Do they have enough flour to make the bread? Show your work.

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• 3.
  Abby and her 2 friends are each making one necklace. They are sharing one package each of glittery beads, clear beads and blue beads. For each necklace, they need $\frac{1}{6}$ of a package of glittery beads, $\frac{3}{6}$ of a package of clear beads and $\frac{2}{6}$ of a package of blue beads. Do they have enough beads? Show your work.

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• 4.
  Adding Multiple-digit Fractions
  Add. Then, simplify when possible.
  a)

  $\frac{12}{84} + \frac{18}{84}$
  
  
  b)

  $\frac{82}{198} + \frac{113}{198}$
  
  
  c)

  $\frac{169}{475} + \frac{137}{475}$
  
  
  d)

  $\frac{173}{198} + (-\frac{101}{198})$
  
  
  e)

  $\frac{221}{345} + \frac{124}{345}$
  
  
  f)

  $\frac{13}{140} + \frac{5}{140} + \frac{10}{140}$
  
  

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