Solution: Page 251 (Large Numbers)

Figure it Out - Large Numbers

• a. (+40) + ____ = +200

  • Start at 40, need to reach 200. Move Up 160.
  • Answer: +160

• b. (+40) + ____ = -200

  • Start at 40, need to reach -200. Move Down 240.
  • Answer: -240

• c. (-50) + ____ = +200

  • Start at -50, reach 200. Move Up 250.
  • Answer: +250

• d. (-50) + ____ = -200

  • Start at -50, reach -200. Move Down 150.
  • Answer: -150

• e. (-200) - (-40) =

  • Think: From -40 to -200. Move Down 160.
  • Answer: -160

• f. (+200) - (+40) =

  • Think: From 40 to 200. Move Up 160.
  • Answer: +160

• g. (-200) - (+40) =

  • Think: From 40 to -200. Move Down 240.
  • Answer: -240

Try Evaluating Expressions (Bottom of Page)

• a. -125 + (-30) = -155
• b. +105 - (-55) = 105 + 55 = +160
• c. +105 + (+55) = +160
• d. +80 - (-150) = 80 + 150 = +230
• e. +80 + (+150) = +230
• f. -99 - (-200) = -99 + 200 = +101
• g. -99 + (+200) = +101
• h. +1500 - (-1500) = 1500 + 1500 = +3000