CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

0 s.
400 + 200 =
80 = 20 +
50 - 40 =
70 = 30 +
700 - 100 =
70 = 10 +
500 = 200 +
90 = 10 +
30 + 20 =
800 = 500 +
40 + 10 =
10 + 10 =
700 = 700 +
600 + 100 =
400 = 300 +
900 - 100 =
400 - 100 =
40 = 40 +
80 = 40 +
60 = 60 +