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Priority to ES125796UpriorityCriticalpatent/ES125796Y/en
Publication of ES125796UpublicationCriticalpatent/ES125796U/en
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Publication of ES125796YpublicationCriticalpatent/ES125796Y/en
Device for teaching arithmetic characterized in that it is composed of a plurality of parallelepiped pieces of width proportional to the numerical magnitude of the figure that they have engraved in the center of their front face, in which the piece bearing the figure 1 constitutes the module for the rest of higher value, said parts having means for reciprocal assembly by its upper and lower flanks, for coupling in height, based on protuberances and recesses in mutual correspondence in equal number to the numerical value of the respective piece, always in equal lateral distancing, so that an alignment of a certain number of pieces is susceptible to join one or two collateral alignments of another number of pieces whose figures add up to the value of those of the first. (Machine-translation by Google Translate, not legally binding)
ES125796U1966-10-291966-10-29
DEVICE FOR TEACHING ARITHMETICS.
ExpiredES125796Y
(en)