CHRONO

300 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
87 + 10 =
62 = 10 +
17 + 50 =
20 + 84 =
65 = 20 +
50 + 28 =
54 = 40 +
31 + 20 =
51 - 10 =
22 = 10 +
73 + 20 =
74 - 50 =
77 = 20 +
99 = 40 +
34 + 70 =
44 + 10 =
30 + 37 =
22 + 80 =
36 + 30 =
20 + 15 =