CHRONO

10 s.

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

CHRONO

0 s.
394 + 11 =
237 + 11 =
801 + 12 =
874 + 11 =
142 + 8 =
407 - 8 =
155 + 12 =
980 - 9 =
340 + 12 =
308 + 8 =
396 - 9 =
797 + 12 =
105 - 12 =
38 - 8 =
129 + 11 =
769 + 8 =
407 - 12 =
69 - 11 =
223 + 12 =
414 - 8 =