CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
93 - 60 =
76 - 30 =
79 + 10 =
20 + 39 =
59 = 10 +
57 + 20 =
54 + 10 =
91 - 60 =
44 = 30 +
21 + 20 =
10 + 59 =
10 + 23 =
95 = 20 +
10 + 95 =
71 - 70 =
47 - 30 =
35 + 30 =
78 - 30 =
79 + 30 =
30 + 18 =