CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
20 + 32 =
55 = 20 +
21 + 30 =
24 = 10 +
36 + 10 =
26 + 10 =
98 = 50 +
67 = 10 +
93 = 40 +
68 = 20 +
19 + 40 =
52 - 40 =
50 + 54 =
26 + 50 =
85 = 10 +
83 = 40 +
39 = 20 +
47 + 30 =
94 - 80 =
67 + 30 =