CHRONO

10 s.

Calculer des compléments à la dizaine supérieure.

CHRONO

0 s.
890 = 886 +
40 = 40 +
760 = 754 +
530 = 530 +
330 = 321 +
560 = 558 +
480 = 473 +
230 = 230 +
770 = 770 +
260 = 257 +
40 = 37 +
460 = 455 +
670 = 668 +
20 = 12 +
220 = 214 +
610 = 606 +
370 = 361 +
40 = 35 +
260 = 255 +
580 = 579 +