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addition up to 20

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