Calcula mentalmente, 30 + 30 =, 30 + 40=, 60 +60=, 60 + 50 =, 600 + 200 =, 60 + 20 =, 610+ 230 =, 510 + 470=, 630 + 220= , 64 + 26=, 34 + 32=, 1000 + 300 + 20 + 1 =, 2000 + 600+ 35=, 50 + 300 + 6 + 1000 =, 700 + 30 + 8=, 980 + 5=, 2.000 + 100 + 50 + 6= , 400 + 67 = , 4.000 + 3 + 70 + 500= .

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