CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
20 + 37 =
36 = 10 +
77 - 50 =
49 = 10 +
71 - 20 =
54 = 40 +
20 + 75 =
84 = 80 +
42 + 10 =
96 - 50 =
59 - 10 =
50 + 16 =
51 + 50 =
79 = 10 +
53 = 50 +
96 - 10 =
10 + 99 =
40 + 26 =
14 + 40 =
44 + 10 =