CHRONO

10 s.

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

CHRONO

0 s.
48 - 12 =
668 - 9 =
429 + 11 =
614 + 8 =
520 - 9 =
630 + 8 =
445 + 9 =
771 + 9 =
202 + 9 =
728 + 11 =
505 - 8 =
302 + 12 =
556 - 12 =
864 + 8 =
890 + 9 =
412 + 9 =
388 + 9 =
406 - 11 =
137 + 12 =
698 + 9 =