CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
350 = 7 x
400 = 8 x
120 = 20 x
20 = 20 x
20 x 3 =
100 = 20 x
80 = 4 x
1 x 20 =
80 = 20 x
300 = 50 x
6 x 20 =
20 x 4 =
9 x 20 =
50 x 7 =
8 x 20 =
50 = 1 x
50 x 8 =
450 = 50 x
60 = 20 x
3 x 50 =