CHRONO

94 s.

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

CHRONO

0 s.
409 - 12 =
639 + 11 =
748 - 12 =
392 + 8 =
438 - 11 =
506 - 12 =
453 + 12 =
619 - 11 =
744 - 8 =
541 + 11 =
500 + 12 =
328 - 9 =
987 - 11 =
821 - 8 =
644 + 9 =
937 + 11 =
741 + 9 =
68 - 11 =
936 + 11 =
564 + 9 =