CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
20 + 45 =
10 + 46 =
70 + 28 =
75 = 60 +
76 - 20 =
36 - 10 =
30 + 63 =
91 - 60 =
57 + 40 =
37 + 10 =
42 + 20 =
34 = 10 +
91 - 80 =
59 - 10 =
23 + 80 =
70 + 34 =
19 + 50 =
69 + 10 =
79 - 40 =
89 + 20 =