CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
20 + 23 =
36 + 60 =
91 - 40 =
16 + 70 =
60 + 35 =
63 - 60 =
77 - 50 =
91 = 10 +
31 + 20 =
78 - 40 =
11 + 10 =
57 = 10 +
61 = 10 +
30 + 16 =
40 + 38 =
88 - 60 =
20 + 83 =
96 - 10 =
38 + 40 =
69 = 50 +