Calcul par numération: 3

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Transcription de la présentation:

Calcul par numération: 3 Ecrire le nombre de carreaux rouges L’affichage des collections doit être bref (de l’ordre de 2s) pour dissuader les élèves de compter un à un. Par exemple pour une dizaine et trois, il est souhaitable qu’ils écrivent 1 et 3, et lisent « treize » ensuite, plutôt que de compter « onze, douze, treize ».

Expliquer sur cette diapo, avec les langage et matériel de numération (dizaine, barre, …) que chaque colonne et chaque ligne contient 10 carreaux.

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Expliquer, sur cette diapo, que les 10 lignes contiennent chacune10 carreaux, et les 10 colonnes également.

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