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plus one minus one

  • Game Code: 3230978
  •  English    39     Public
    addition and subtraction up to 20 +1 -1
  •   Study   Slideshow
  • 17+1
    =18
  •  15
  • 17-1
    =16
  •  15
  • 18+1
    =19
  •  15
  • 18-1
    =17
  •  15
  • 19+1
    =20
  •  15
  • 19-1
    =18
  •  15
  • 20-1
    =19
  •  15
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