Un jardinier dispose d’une citerne d’une capacité de 2500 L. Il en tire d’abord 1/5, puis les 3/5 de ce qui reste.
Quelle quantité d’eau, en litres, a-t-il utilisée chaque fois ? Quelle quantité d’eau reste-t-il dans la citerne ?
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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