CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
50 = 10 +
90 - 50 =
400 + 100 =
90 = 30 +
400 = 200 +
50 - 10 =
60 - 40 =
70 - 50 =
200 + 400 =
70 - 70 =
60 - 30 =
600 - 400 =
500 + 200 =
40 + 40 =
600 = 500 +
30 + 10 =
600 = 600 +
80 + 10 =
300 + 100 =
500 = 200 +