CHRONO

-INF s.

Ajouter ou soustraire des dizaines entières.

CHRONO

0 s.
30 + 60 =
70 + 10 =
60 - 30 =
40 = 10 +
40 = 40 +
80 - 80 =
10 + 10 =
20 + 30 =
60 + 20 =
10 - 10 =
30 + 40 =
50 - 40 =
80 = 50 +
50 + 20 =
20 - 10 =
10 + 20 =
50 = 50 +
20 + 50 =
70 = 50 +
80 = 80 +