CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
49 + 10 =
10 + 25 =
10 + 94 =
31 = 20 +
19 + 70 =
77 = 60 +
88 = 30 +
92 = 30 +
50 + 13 =
14 + 50 =
57 - 10 =
69 = 60 +
40 + 58 =
36 - 10 =
71 = 10 +
40 + 24 =
80 + 22 =
24 + 50 =
67 = 20 +
80 + 12 =