Cálculo Mental


Calcula mentalmente.


50+50=                 500+500=                   5000+5000=              50000+50000=


10+10=                  100+100=                 1000+1000=                10000+10000=


25+25=                 250+250=                   2500+2500=               25000+25000=


20+20=                 200+200=                   2000+2000=               20000+20000=


30+30=                 300+300=                   3000+3000=               30000+30000=





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