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Addition to 20

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  • 2+16
    18
  • 4+6
    10
  • 13+5
    18
  • 4+3
    7
  • 4+9
    13
  • 1+9
    10
  • 17+3
    20
  • 5+6
    11
  • 15+5
    20
  • 3+8
    11
  • 12+4
    16
  • 7+2
    9
  • 1+15
    16
  • 14+5
    19
  • 14+3
    17
  • 4+14
    18
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