CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
76 = 40 +
60 + 29 =
52 + 30 =
43 + 60 =
61 - 50 =
48 + 40 =
61 + 10 =
81 = 10 +
52 = 40 +
99 - 70 =
10 + 41 =
36 = 30 +
41 - 20 =
71 = 10 +
71 = 30 +
56 + 50 =
84 - 80 =
95 - 70 =
95 - 60 =
91 = 20 +