CHRONO

26 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
30 + 21 =
50 + 42 =
72 = 70 +
37 + 30 =
20 + 37 =
70 + 16 =
34 + 10 =
18 + 60 =
73 = 70 +
53 = 30 +
88 - 40 =
14 + 90 =
15 + 80 =
46 - 10 =
11 + 20 =
63 = 60 +
57 = 50 +
83 = 20 +
17 - 10 =
68 + 40 =