CHRONO

10 s.

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

CHRONO

0 s.
236 + 12 =
317 + 8 =
343 + 9 =
949 + 8 =
443 - 9 =
748 - 9 =
167 - 8 =
216 + 8 =
48 - 8 =
509 + 9 =
544 + 12 =
950 - 9 =
304 + 9 =
833 + 11 =
636 + 11 =
866 - 11 =
529 + 9 =
644 + 11 =
274 + 12 =
873 - 11 =