CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
450 = 50 x
50 x 4 =
20 x 4 =
50 x 3 =
50 = 1 x
300 = 6 x
7 x 20 =
8 x 20 =
20 = 1 x
5 x 50 =
6 x 20 =
50 x 6 =
120 = 20 x
100 = 2 x
50 x 7 =
180 = 9 x
2 x 50 =
20 x 8 =
50 = 50 x
180 = 20 x