Subtracting integers

Lessons

• Introduction
  Introduction to subtracting integers vertically

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• 1.
  Subtract using a number line.
  a)

  (+5) – (+2)
  
  
  b)

  (+9) – (+7)
  
  
  c)

  (-10) – (-3)
  
  

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• 2.
  George lives 15 floors up from street level in his apartment. He rides down the elevator from his room to a parking level that is two floors below street level. How many floors does he ride down in total?

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• 3.
  The temperature recorded in Whitehorse, Yukon on Christmas day is -20 degrees Celsius. On the same day in Hawaii, the temperature is + 25 degrees Celsius. What is the temperature difference between these two places?

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• 4.
  Subtracting 1-digit Integers Vertically– Like Signs
  Subtract the following integers vertically.
  a)

  $(+5)-(+2)$
  
  
  b)

  $(+3)-(+9)$
  
  
  c)

  $(-2)-(-6)$
  
  
  d)

  $(-9)-(-7)$
  
  

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• 5.
  Subtracting 1-digit Integers Vertically – Unlike Signs
  Subtract the following integers vertically.
  a)

  $(+3)-(-4)$
  
  
  b)

  $(-1)-(+6)$
  
  

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• 6.
  Subtracting 2-digit integers Vertically
  Subtract the following integers vertically.
  a)

  $(+36)-(+79)$
  
  
  b)

  $(-47)-(-82)$
  
  
  c)

  $(+53)-(-28)$
  
  
  d)

  $(-25)-(+66)$
  
  

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