CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
20 + 56 =
45 - 40 =
85 - 10 =
83 = 80 +
79 = 30 +
30 + 15 =
30 + 48 =
94 = 20 +
43 = 40 +
44 + 50 =
17 + 30 =
40 + 47 =
91 = 30 +
56 = 40 +
33 - 10 =
25 + 50 =
60 + 47 =
64 + 40 =
93 = 70 +
39 - 20 =