90 + 30 = ......., 200 + ...... = 500, ...... - 300 = 600, 1000 - ....... = 700, 6 + 6 + 6 = ....., 15 + 15 = ......, 30 + 30 + 30 = ....., 400 + ..... = 800, 200 + 300 = ....., 20 + 20 + 20 + ..... = 80, 80 - 40 = ......, 5.000 - 2.500 = ....., 50 - ..... = 25, 10.000 - 8.000 = ....., 50 + 50 + 50 = ....., 7.000 + ..... = 1.000, 15 + .... = 30, 100 + 100 + 150 + 150 = ....., 2.000 + 2.000 + 2.000 + 2.000 + ....... = 1.000, 600 - 200 = ......

Cálculos mentales - 3° grado

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