CHRONO

54 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

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