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Addition/Subtraction

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  • 11 - 1 =
    10
  • 10 + 2 =
    12
  • 10 + 2 + 1 =
    13
  • 17 - 5 =
    12
  • 8 + 8 =
    16
  • 18 - 8 =
    10
  • 15 - 8 =
    7
  • 18 - 18 =
    0
  • 13 + 5 =
    18
  • 18 - 14 =
    4
  • 11 + 8 =
    19
  • 20 - 8
    12
  • 16 - 7 =
    9
  • 18 - 4 =
    14
  • 20 - 11
    9
  • 17 - 10 =
    7
  • 13 - 12 =
    1
  • 14 - 3 =
    11
  • 12 + 7 =
    19
  • 14 + 1 =
    15
  • 10 + 6 =
    16
  • 7 + 13 =
    20
  • 4 + 2 + 5 =
    11
  • 17 - 4 =
    13
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