CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
300 = 50 x
40 = 20 x
450 = 50 x
1 x 50 =
300 = 6 x
50 x 6 =
6 x 20 =
400 = 50 x
100 = 5 x
160 = 8 x
140 = 7 x
20 x 8 =
150 = 50 x
4 x 50 =
60 = 3 x
9 x 20 =
40 = 2 x
50 x 1 =
3 x 50 =
20 x 3 =