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Grille De 100

Age 5 to 7
Challenge Level Yellow starYellow star
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Pour 1$^{ère}$ cycle de l'élémentaire

Mise en situation

On a imprimé une grille de 100 de chaque côté d'une feuille de papier. Les 4 coins des deux grilles correspondent exactement.
 
 


Exploration

Quel est le nombre directement en arrière de 100? De 58? De 23? De 19?
Y a-t-il un patron permettant de determiner ces nombres sans avoir à regarder?

Suggestion

Avoir des copies de grille de 100 à la portée de la main mais imprimées d'un seul côté

Source: Hundred Square

 
Translated by Renée Michaud, Coordonnatrice et consultante de mathématiques et sciences, Consortium provincial francophone pour le perfectionnement professionnel, Calgary, Canada 

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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