CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
57 - 30 =
50 + 21 =
58 = 50 +
20 + 67 =
62 - 50 =
26 - 10 =
18 + 20 =
32 + 50 =
23 + 50 =
82 = 20 +
98 = 20 +
73 = 50 +
70 + 11 =
55 = 40 +
50 + 16 =
83 + 10 =
59 - 30 =
98 - 90 =
91 - 40 =
87 = 80 +