• commutativité de l'addition CP

    commutativité de l'addition CP

    Pour travailler la commutativité de l'addition, nous jouons d'abord aux dés, puis aux cartes avec 2 dés et 2 cartes et notons les sommes obtenues. Au cours de da mise en commun, on constate que 2+6 et 6+2 c'est pareil mais qu'il est plus facile de dire 6 et de surcompter 2 que le contraire, on s'entraine donc à écrire que 2+6=6+2 pour que ce soit plus simple à calculer.


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    MALILUNO Profil de MALILUNO
    Mardi 6 Novembre 2012 à 15:22

    c'est exactement ce que je cherchais!! merci!! (heu par contre je crois que dans l'ex 1 pour 2+4 tu n'as pas inversé les dés pour le 4+2 en dessous...)

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