CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
10 + 53 =
13 + 90 =
10 + 36 =
78 - 50 =
16 + 50 =
77 - 10 =
26 + 70 =
46 = 20 +
28 + 60 =
30 + 49 =
70 + 15 =
52 - 30 =
22 + 70 =
39 = 20 +
21 + 30 =
77 = 30 +
40 + 51 =
57 = 50 +
53 - 30 =
77 - 70 =