CHRONO

28 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
70 + 15 =
38 - 30 =
68 - 20 =
41 + 20 =
15 + 80 =
88 + 10 =
68 = 20 +
10 + 18 =
51 = 50 +
67 - 30 =
88 - 10 =
31 + 40 =
22 - 20 =
95 = 90 +
66 + 20 =
98 - 60 =
30 + 32 =
50 + 37 =
47 + 20 =
68 = 60 +