Des maçons doivent construire un mur de 25 m de long en trois jours. La première journée, ils en édifient les 2/5 puis 1/4 le lendemain.
Quelle longueur de mur leur restera-t-il à construire le troisième jour ?
Lors de ce rituel, les élèves doivent tenter de résoudre un problème donné.
La démarche de résolution et la compréhension du problème donné compte plus que le résultat.
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