CHRONO

10 s.

Calculs sur les dizaines ou des centaines entières.

CHRONO

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