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Basic maths to 20

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  • 20-13=
    7
  • 11+3=
    14
  • 9+9=
    18
  • 15-12=
    3
  • 19-7=
    12
  • 7+13=
    20
  • 7+10=
    17
  • 17-9=
    8
  • 16-9=
    7
  • 3+12=
    15
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