CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
39 - 30 =
84 + 20 =
79 - 60 =
41 + 20 =
37 - 10 =
10 + 14 =
10 + 57 =
81 = 30 +
24 + 60 =
94 - 50 =
87 - 10 =
53 = 10 +
67 - 60 =
30 + 59 =
22 - 10 =
75 - 20 =
50 + 31 =
30 + 26 =
40 + 57 =
68 = 20 +