CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
30 + 67 =
43 = 40 +
87 - 60 =
51 - 30 =
51 + 20 =
98 - 90 =
20 + 14 =
75 + 20 =
16 + 30 =
10 + 34 =
75 = 70 +
51 - 10 =
25 = 20 +
26 + 30 =
11 + 80 =
70 + 16 =
56 = 40 +
30 + 53 =
48 - 20 =
10 + 39 =