CHRONO

41 s.

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

CHRONO

0 s.
665 - 9 =
485 - 12 =
108 + 8 =
403 - 8 =
280 + 12 =
167 + 11 =
70 - 12 =
289 - 12 =
950 - 8 =
129 + 9 =
833 - 9 =
667 - 12 =
889 + 9 =
823 + 11 =
82 + 11 =
485 - 11 =
983 - 12 =
936 - 11 =
411 + 12 =
212 - 12 =