CHRONO

10 s.

Multiplier un nombre simple par 20 ou 50.

CHRONO

0 s.
350 = 7 x
9 x 20 =
20 x 8 =
2 x 50 =
150 = 50 x
120 = 6 x
9 x 50 =
60 = 20 x
40 = 20 x
140 = 20 x
400 = 50 x
180 = 20 x
150 = 3 x
300 = 6 x
100 = 50 x
120 = 20 x
20 x 5 =
100 = 2 x
8 x 20 =
50 x 5 =