CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
20 = 20 x
7 x 50 =
4 x 20 =
20 x 5 =
50 x 4 =
50 x 1 =
1 x 20 =
20 x 8 =
100 = 2 x
150 = 3 x
300 = 50 x
3 x 20 =
400 = 50 x
300 = 6 x
50 = 50 x
120 = 6 x
50 x 3 =
50 x 9 =
160 = 8 x
20 = 1 x