CHRONO

10 s.

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

CHRONO

0 s.
862 - 12 =
91 - 11 =
223 + 8 =
443 - 12 =
646 - 9 =
942 - 8 =
166 + 12 =
297 - 8 =
413 - 9 =
353 + 9 =
280 + 11 =
777 + 9 =
153 - 11 =
101 + 8 =
109 - 12 =
148 - 12 =
360 + 9 =
509 + 9 =
68 - 12 =
318 + 11 =