11 février 2009

1er serpent positif - le complément à 10

Le premier serpent positif est celui qui permet à l'enfant de percevoir que plusieurs combinaisons de perles colorées peuvent "s'échanger" contre 10, la barre dorée.


La succession de perles proposée est donc composée uniquement de perles dont la somme est 10. L'enfant compte grâce au "cavalier", une petite baguette de métal, ou, comme chez nous un morceau de papier qui permet à l'enfant de bien voir où il en est, et surtout de prendre la barre de 10 sans perdre le fil de son travail. Il le pose, là où il en est, surtout au moment où il atteint 10, et où il pose au dessus sa barre équivalente, avant de retirer en dessous les barres dont la somme fait 10.

puis il continue...

La dernière perle sera échangée par une perle noir du change (l'escalier de perle noires et blanches).
à la fin, il pose verticalement les barres de 10 et la perle de change, et met à coté l'équivalent de chaque barre pour vérifier qu'aucune n'est en trop.
C'est le contrôle de l'erreur.

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