CHRONO

10 s.

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

CHRONO

0 s.
869 + 8 =
777 + 8 =
955 + 12 =
176 - 11 =
684 + 11 =
186 - 9 =
699 - 12 =
937 + 9 =
102 + 11 =
606 - 8 =
92 + 8 =
322 + 8 =
571 + 9 =
620 + 9 =
474 - 12 =
567 + 8 =
695 + 9 =
302 + 12 =
713 + 11 =
734 - 8 =