CHRONO

10 s.

Calculer sur les multiples de 250.

CHRONO

0 s.
250 = 1250 -
2000 = 1250 +
1250 = 750 +
2000 - 750 =
1000 - 500 =
500 = 1000 -
1750 = 250 +
750 = 1250 -
25 x 10 =
1000 = 1500 -
1750 - 1500 =
1250 = 250 +
750 = 2000 -
2250 - 1000 =
30 x 25 =
1000 = 250 +
500 = 750 -
1000 = 750 +
750 = 1750 -
40 x 25 =