CHRONO

26 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
24 - 10 =
58 - 50 =
39 - 20 =
74 + 10 =
70 + 11 =
60 + 11 =
72 - 50 =
30 + 34 =
39 - 10 =
40 + 14 =
20 + 81 =
40 + 36 =
10 + 88 =
11 + 20 =
47 - 10 =
45 = 10 +
40 + 16 =
60 + 23 =
81 - 70 =
13 + 50 =