CHRONO

10 s.

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

CHRONO

0 s.
633 + 12 =
509 - 8 =
692 - 8 =
404 - 12 =
681 + 12 =
972 - 9 =
131 + 8 =
734 - 9 =
316 + 9 =
303 - 11 =
308 + 12 =
569 - 12 =
404 + 8 =
249 - 11 =
656 + 8 =
178 - 8 =
91 + 8 =
22 + 9 =
932 - 11 =
818 + 8 =