CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
70 = 20 +
70 - 10 =
900 = 600 +
100 + 300 =
200 + 500 =
500 - 400 =
900 - 500 =
60 + 30 =
60 + 10 =
70 + 20 =
50 + 30 =
60 = 40 +
200 + 700 =
90 = 50 +
400 + 500 =
20 + 40 =
50 - 50 =
60 - 60 =
400 - 100 =
50 - 30 =