CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
40 = 10 +
400 - 100 =
100 + 700 =
20 + 20 =
50 = 40 +
400 + 500 =
90 = 80 +
600 - 100 =
10 + 50 =
800 = 700 +
200 - 100 =
40 + 20 =
700 - 500 =
900 - 300 =
500 = 100 +
80 = 30 +
700 = 100 +
10 + 10 =
70 + 10 =
500 + 100 =