CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
87 - 80 =
10 + 55 =
35 = 30 +
52 - 50 =
79 = 30 +
21 + 70 =
47 + 10 =
66 - 50 =
30 + 73 =
69 = 40 +
95 - 30 =
95 = 70 +
50 + 56 =
40 + 17 =
44 + 30 =
51 + 50 =
12 + 80 =
70 + 21 =
92 - 90 =
63 - 60 =