CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
85 = 60 +
38 = 30 +
55 = 20 +
60 + 48 =
82 = 20 +
40 + 15 =
43 = 20 +
23 - 20 =
69 + 30 =
67 - 50 =
28 - 20 =
30 + 78 =
30 + 72 =
25 + 80 =
65 - 20 =
40 + 46 =
30 + 24 =
10 + 55 =
24 + 50 =
94 = 80 +