CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
66 - 30 =
42 = 20 +
40 + 16 =
53 = 50 +
64 - 60 =
76 = 40 +
57 = 20 +
21 + 10 =
51 - 10 =
56 = 50 +
94 - 60 =
67 = 10 +
60 + 22 =
85 - 50 =
28 = 20 +
12 + 50 =
51 = 40 +
70 + 39 =
45 = 20 +
33 + 10 =