CHRONO

2 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

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