CÁLCULO MENTAL 2.º - NIVEL 3

Calcula mentalmente :
60 + 20 = ____________________
50 + 40 = ____________________
10 + 70 = ____________________
30 + 40 = ____________________
70 + 20 = ____________________
80 + 10 = ____________________

Calcula mentalmente :
60 + 3 = ____________________
30 + 9 = ____________________
80 + 4 = ____________________
40 + 7 = ____________________
20 + 8 = ____________________
70 + 2 = ____________________

Calcula mentalmente :
80 - 50 = ____________________
60 - 30 = ____________________
90 - 70 = ____________________
20 - 10 = ____________________
50 - 20 = ____________________
70 - 40 = ____________________

30 - 4 = ____________________
90 - 7 = ____________________
60 - 2 = ____________________
50 - 3 = ____________________
70 - 9 = ____________________
40 - 6 = ____________________