CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
89 - 70 =
84 = 40 +
40 + 58 =
67 - 60 =
58 = 40 +
91 = 40 +
68 - 50 =
36 + 30 =
17 + 60 =
80 + 28 =
94 = 60 +
86 - 30 =
10 + 19 =
21 - 10 =
60 + 21 =
76 - 50 =
20 + 87 =
87 = 80 +
93 = 50 +
44 = 30 +