CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
20 x 1 =
180 = 9 x
450 = 9 x
140 = 7 x
60 = 3 x
80 = 20 x
9 x 50 =
450 = 50 x
50 x 5 =
100 = 2 x
50 = 50 x
9 x 20 =
5 x 20 =
350 = 50 x
20 x 2 =
40 = 2 x
8 x 50 =
20 x 9 =
80 = 4 x
20 = 20 x