CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
85 = 80 +
10 + 83 =
48 = 20 +
35 + 40 =
81 - 30 =
47 + 10 =
29 + 70 =
89 + 20 =
70 + 27 =
32 + 10 =
51 + 20 =
42 - 20 =
10 + 56 =
99 = 70 +
55 + 50 =
51 + 10 =
95 = 10 +
60 + 42 =
37 + 70 =
20 + 28 =