CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
24 = 10 +
12 + 80 =
62 = 20 +
67 - 10 =
40 + 31 =
26 = 20 +
86 - 80 =
88 - 10 =
49 = 20 +
64 = 30 +
90 + 13 =
41 = 10 +
19 + 50 =
30 + 16 =
40 + 19 =
29 = 10 +
32 = 30 +
81 - 10 =
66 + 30 =
52 - 40 =