CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
67 + 10 =
54 = 50 +
20 + 89 =
17 + 30 =
41 = 10 +
97 - 40 =
86 - 10 =
71 + 30 =
91 = 90 +
41 - 10 =
77 = 30 +
68 = 20 +
96 = 20 +
10 + 19 =
53 - 50 =
79 = 20 +
55 + 50 =
83 = 30 +
25 + 50 =
43 = 10 +