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Addition and Subtraction within 20

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