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CÀLCULO MENTAL

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  • 60+20=
    80
  • 60+30=
    90
  • 40+30=
    70
  • 25+53=
    78
  • 60+40=
    100
  • 20+30=
    50
  • 15+35=
    50
  • 60+10=
    70
  • 40+40=
    80
  • 43+51=
    94
  • 24+30=
    54
  • 72+12=
    84
  • 34+13=
    47
  • 25+25=
    50
  • 31+40=
    71
  • 32+22=
    54
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