CHRONO

10 s.

Ajouter et retrancher des nombres comme 8, 9, 11, 12.

CHRONO

0 s.
375 + 11 =
627 + 8 =
791 + 12 =
23 + 11 =
829 + 8 =
162 - 8 =
636 + 11 =
830 - 12 =
550 - 9 =
615 + 11 =
105 + 9 =
429 + 9 =
227 - 12 =
254 + 11 =
131 - 11 =
926 - 9 =
643 + 8 =
799 + 8 =
479 + 8 =
433 - 11 =