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Addition and subtraction within 20

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