CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
31 + 70 =
81 + 20 =
39 = 10 +
93 = 30 +
99 - 30 =
31 + 30 =
25 + 30 =
49 - 40 =
78 = 40 +
20 + 31 =
39 = 20 +
50 + 36 =
99 = 60 +
42 = 10 +
77 = 50 +
81 - 70 =
30 + 61 =
38 - 30 =
40 + 64 =
37 = 30 +