CHRONO

10 s.

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

CHRONO

0 s.
742 + 11 =
105 + 11 =
789 + 11 =
939 - 12 =
113 - 8 =
525 - 8 =
89 + 12 =
449 + 9 =
911 + 9 =
742 + 8 =
572 - 11 =
163 - 8 =
61 + 11 =
806 - 12 =
237 + 9 =
64 + 12 =
330 - 8 =
330 - 12 =
540 - 9 =
852 - 8 =