CHRONO

52 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
30 + 46 =
29 + 80 =
40 + 67 =
75 + 20 =
33 + 50 =
64 = 50 +
18 = 10 +
64 + 30 =
30 + 15 =
74 - 40 =
20 + 45 =
98 - 80 =
77 - 10 =
10 + 19 =
29 + 10 =
34 = 20 +
37 + 40 =
24 + 70 =
26 + 40 =
28 + 50 =