| 摘要 |
The invention relates to a device making it possible to teach the solution to an arithmetic problem by virtue of a simulation of the collections in play in the problem and of a system of masks which makes it possible to differentiate the perceptive information acquisitions. It consists of a framework 1 comprising two windows 3 and 4 equipped with masks 15, 16, 17 and a plate 8 which serves as a support for collections of removable elements 9, may slide behind a frame 10 which serves as decor for the problem. There are two types of decor frame according to the nature of the arithmetic problem whose solution is being taught. <IMAGE>
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