CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
48 = 20 +
21 - 20 =
57 = 40 +
97 = 40 +
91 - 90 =
39 + 70 =
99 = 70 +
76 = 70 +
54 - 50 =
46 = 20 +
11 + 60 =
62 = 40 +
33 + 70 =
56 + 30 =
72 = 50 +
51 = 40 +
30 + 14 =
24 - 20 =
93 = 60 +
10 + 65 =