CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
58 - 30 =
24 = 10 +
47 + 60 =
96 - 60 =
50 + 45 =
72 = 10 +
12 + 70 =
22 - 10 =
89 = 30 +
54 - 50 =
48 = 40 +
88 = 10 +
73 - 20 =
65 = 20 +
83 - 80 =
95 = 60 +
86 = 30 +
64 = 50 +
81 = 80 +
49 + 50 =