CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
20 + 10 =
300 + 200 =
700 - 100 =
80 = 20 +
80 = 40 +
400 = 200 +
90 = 10 +
70 = 10 +
200 = 100 +
40 + 10 =
30 - 10 =
70 - 50 =
400 = 100 +
500 = 200 +
40 - 40 =
100 + 200 =
50 + 20 =
90 = 20 +
40 + 40 =
600 + 300 =