CHRONO

2 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
57 + 50 =
98 + 10 =
39 = 30 +
66 - 30 =
97 = 20 +
10 + 79 =
29 + 10 =
50 + 38 =
15 - 10 =
69 = 40 +
86 = 20 +
30 + 64 =
99 = 30 +
72 = 70 +
20 + 21 =
10 + 46 =
20 + 76 =
87 + 20 =
94 = 10 +
46 - 20 =