CHRONO

10 s.

Ajouter ou soustraire des dizaines entières et compléments.

CHRONO

0 s.
24 - 10 =
14 + 50 =
91 - 50 =
49 - 40 =
16 = 10 +
84 - 70 =
30 + 21 =
66 + 10 =
97 = 20 +
98 = 80 +
15 + 90 =
16 + 30 =
93 - 60 =
10 + 92 =
97 - 70 =
60 + 42 =
62 - 30 =
78 = 50 +
30 + 59 =
16 + 70 =