CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
40 + 50 =
900 = 900 +
600 = 200 +
70 = 20 +
900 = 100 +
90 - 80 =
400 + 200 =
200 + 400 =
80 - 50 =
80 = 70 +
700 - 300 =
500 = 400 +
300 - 200 =
80 = 40 +
20 + 40 =
700 = 100 +
100 + 300 =
40 - 10 =
10 + 40 =
50 + 40 =