500 + 250 =, 267 - 67 =, 320 + 20 + 4 =, 400 - 1 =, 70 + 30 =, 78 - 4 =, 900 - 800 =, 60 + 60 =, 888 - 444 =, 120 + 80 =, 700 + 10 + 5 =, 400 + 500 =, 650 - 50 =, 50 + 50 + 50 =, 235 - 35 =, 100 - 99 =, 300 - 10 =, 256 + 10 =, 495 + 5 =, 389 - 9 =, 140 - 30 =, 20 + 20 + 40 =, 999 + 1 =.
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Cálculo mental segundo grado
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