CHRONO

21 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
900 = 600 +
600 = 300 +
900 - 200 =
40 - 40 =
60 = 50 +
20 = 10 +
70 = 40 +
50 - 50 =
50 + 20 =
800 - 400 =
300 = 100 +
50 + 40 =
70 = 70 +
200 + 400 =
60 - 30 =
90 = 70 +
70 = 50 +
20 + 40 =
30 = 10 +
100 + 500 =