CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
150 = 3 x
5 x 50 =
60 = 3 x
6 x 50 =
20 x 6 =
50 x 3 =
100 = 5 x
20 x 9 =
20 x 5 =
300 = 50 x
80 = 4 x
7 x 50 =
20 = 1 x
180 = 9 x
3 x 20 =
8 x 20 =
450 = 9 x
400 = 8 x
20 x 1 =
20 x 2 =