CÁLCULO MENTAL 2.º - NIVEL 2

Calcula mentalmente :
4 + 5 = ____________________
6 + 8 = ____________________
7 + 6 = ____________________

3 + 4 + 2 = ____________________
2 + 5 + 3 = ____________________
4 + 1 + 5 = ____________________

5 + 2 + 8 = ____________________
6 + 3 + 9 = ____________________
1 + 7 + 7 = ____________________

7 + 6 + 3 = ____________________
9 + 5 + 4 = ____________________
8 + 6 + 5 = ____________________