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sub and add 20

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