CHRONO

10 s.

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

CHRONO

0 s.
322 - 9 =
350 + 8 =
810 - 12 =
91 - 12 =
128 + 12 =
788 - 12 =
81 - 12 =
79 - 12 =
212 + 8 =
235 + 11 =
982 - 8 =
307 - 9 =
944 + 12 =
159 + 11 =
875 + 8 =
171 - 11 =
276 + 8 =
509 - 12 =
513 - 11 =
284 + 11 =