CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
91 = 70 +
61 = 10 +
30 + 75 =
54 = 20 +
58 = 30 +
89 - 60 =
65 - 40 =
20 + 57 =
40 + 33 =
62 - 40 =
74 + 20 =
10 + 93 =
22 + 80 =
87 = 80 +
10 + 86 =
73 = 10 +
77 - 40 =
91 = 10 +
79 + 20 =
40 + 34 =