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Mental calculation

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  • 2+1=
    3
  • 1+1=
    2
  • 4+1=
    5
  • 2+8=
    10
  • 3+3=
    6
  • 1+9=
    10
  • 4+4=
    8
  • 8-1=
    7
  • 3+7
    10
  • 7-1=
    6
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