CHRONO

54 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
13 + 10 =
30 + 66 =
68 = 50 +
15 + 80 =
30 + 55 =
54 - 10 =
65 - 50 =
20 + 77 =
87 - 60 =
18 - 10 =
59 = 20 +
20 + 48 =
70 + 27 =
88 - 80 =
67 = 40 +
23 + 60 =
58 - 30 =
31 = 30 +
27 + 40 =
10 + 43 =