CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
60 = 3 x
400 = 50 x
50 x 6 =
3 x 20 =
200 = 4 x
20 = 20 x
100 = 20 x
350 = 7 x
180 = 9 x
9 x 50 =
120 = 20 x
2 x 50 =
1 x 50 =
40 = 20 x
20 x 3 =
20 x 7 =
9 x 20 =
7 x 20 =
140 = 20 x
20 x 5 =