CÁLCULO MENTAL 2.º - NIVEL 1

Calcula mentalmente :
7 + 3 = ____________________
5 + 5 = ____________________
1 + 9 = ____________________

Calcula mentalmente :
2 + 8 = ____________________
6 + 4 = ____________________
10 + 0 = ____________________

Calcula mentalmente :
40 + 60 = ____________________
80 + 20 = ____________________
90 + 10 = ____________________

Calcula mentalmente :
30 + 70 = ____________________
50 + 50 = ____________________
0 + 100 = ____________________