CHRONO

10 s.

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

CHRONO

0 s.
73 + 9 =
423 + 11 =
535 - 8 =
405 + 9 =
235 - 12 =
52 + 12 =
899 + 8 =
151 + 8 =
234 - 9 =
746 + 12 =
526 + 9 =
982 - 12 =
879 - 8 =
152 + 11 =
95 + 12 =
552 - 9 =
224 - 11 =
657 + 11 =
677 - 11 =
323 + 11 =