CHRONO

94 s.

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

CHRONO

0 s.
760 + 8 =
629 + 8 =
234 + 9 =
529 - 11 =
545 - 11 =
141 - 12 =
326 + 12 =
699 - 8 =
724 - 9 =
143 + 8 =
268 - 9 =
56 + 12 =
210 - 8 =
305 + 8 =
690 + 9 =
28 + 12 =
108 - 11 =
118 + 9 =
531 - 11 =
846 + 9 =