CHRONO

31 s.

Calculer de 20 en 20, de 50 en 50.

CHRONO

0 s.
124 = 50 +
349 + 20 =
340 = 20 +
166 + 20 =
194 + 50 =
389 = 50 +
140 + 20 =
171 + 20 =
357 + 50 =
252 = 50 +
335 = 20 +
373 = 20 +
160 + 50 =
227 + 20 =
299 = 20 +
356 = 50 +
130 + 20 =
192 = 50 +
408 = 50 +
355 = 50 +