CHRONO

10 s.

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

CHRONO

0 s.
637 + 8 =
351 + 9 =
179 - 11 =
199 + 9 =
934 - 8 =
780 + 11 =
150 - 9 =
314 - 9 =
437 + 8 =
710 - 12 =
370 - 8 =
890 + 11 =
948 - 12 =
706 + 9 =
449 + 11 =
424 - 11 =
598 + 12 =
90 - 8 =
940 + 9 =
329 - 8 =