CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
9 x 20 =
50 x 5 =
400 = 50 x
40 = 2 x
180 = 9 x
120 = 20 x
50 x 6 =
50 = 50 x
4 x 20 =
6 x 20 =
60 = 20 x
20 = 1 x
20 x 6 =
8 x 20 =
8 x 50 =
100 = 50 x
450 = 50 x
40 = 20 x
50 = 1 x
20 x 3 =