CHRONO

10 s.

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

CHRONO

0 s.
894 + 9 =
962 + 12 =
721 - 12 =
644 - 9 =
466 - 12 =
290 - 9 =
296 - 12 =
912 + 11 =
337 - 11 =
775 + 12 =
150 - 8 =
23 - 8 =
328 + 12 =
400 + 12 =
116 + 11 =
339 + 9 =
683 + 12 =
698 - 11 =
946 - 11 =
708 + 8 =