Calcul par numération: 4

Présentation au sujet: "Calcul par numération: 4"— Transcription de la présentation:

1 Calcul par numération: 4
Ecrire le nombre de petits carrés rouges L’affichage des collections doit être bref (de l’ordre de 3s) pour dissuader les élèves de compter un à un les unités, dizaines ou centaines. Une fois que les élèves ont écrit les trois nombres (des centaines, dizaines, unités), possiblement séparément, il est essentiel de leur faire lire le nombre formé par les trois chiffres et de vérifier qu’ils comprennent bien que c’est le nombre de petits carrés (celui que l’on trouverait en les comptant ).

2 Expliquer sur cette diapo, avec le langage (plaque, barre, petit carré) et matériel de numération (centaine, dizaine, barre, …) que chaque colonne et chaque ligne contient 10 carreaux.

3 Après l’écriture 1 2 3, insistez sur la lecture du nombre: « Cent-vingt-trois ». Combien trouverait–on de petits carrés si on les comptait ?

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

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