Materials educative for the comprehension of the four operations and the learning base arithmetriques

摘要

The hardware has a set of cards, and an orientation unit e.g. shading, for orienting each card with respect to each other in an assembly of cards constituting the set of cards and/or a common identification unit. The set of cards is divided into certain number of sub-assemblies corresponding to different tables of operations to be learned. The sub-assemblies corresponding to the assembly of the cards have a card identification unit between the cards for identifying the cards of each of the sub-assemblies.