CHRONO

28 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
61 - 30 =
30 + 47 =
52 = 20 +
81 - 50 =
62 + 20 =
11 + 70 =
35 + 30 =
85 + 20 =
17 + 70 =
15 - 10 =
60 + 15 =
34 - 20 =
34 + 50 =
82 = 50 +
85 - 40 =
52 + 30 =
41 + 30 =
10 + 81 =
18 + 90 =
70 + 31 =