CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
200 = 100 +
500 = 500 +
800 + 100 =
20 + 30 =
100 + 700 =
10 + 70 =
20 + 70 =
70 = 20 +
800 = 400 +
800 = 300 +
70 - 40 =
100 + 400 =
80 - 60 =
70 = 30 +
70 - 50 =
50 + 40 =
600 + 100 =
400 = 400 +
40 + 10 =
900 = 700 +