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Addition and Subtraction up to 20

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