CHRONO

2 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
10 + 83 =
17 + 60 =
84 = 80 +
50 + 11 =
37 + 70 =
10 + 55 =
93 + 10 =
74 = 50 +
20 + 13 =
51 = 40 +
81 = 10 +
57 - 40 =
97 = 20 +
40 + 42 =
43 - 10 =
59 + 50 =
25 + 30 =
10 + 91 =
50 + 15 =
93 - 90 =