CHRONO

10 s.

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

CHRONO

0 s.
335 + 11 =
660 + 11 =
343 - 8 =
706 + 8 =
39 + 12 =
900 - 12 =
379 + 12 =
126 - 9 =
868 + 11 =
629 + 12 =
693 + 12 =
223 + 12 =
72 + 11 =
568 + 11 =
937 + 12 =
31 + 11 =
279 + 9 =
842 + 9 =
377 + 11 =
910 - 11 =