| 摘要 |
<p>The invention provides a device for teaching concepts of numbers and mathematical principles comprising a base component having a surface divided into a hundred identical unit squares in ten by ten format, and a plurality of number elements for use with said base component, each said number element being dimensioned so that it corresponds exactly in size and shape with the whole number of said unit squares of said base component, each said number element displaying unit squares corresponding to those unit squares it covers on said base component when said number element is placed on said base component, and each said number element being also marked with the number which it represents in terms of said unit squares. The displaying function can be achieved either by said number elements being sufficiently transparent to allow said unit squares on said base component to be visible through said number elements, or alternatively, if said number elements are themselves opaque, then they can be marked with unit squares identical in size to those on said base component. The invention further provides boxes wherein said number elements can be stored in a manner expressive of basic arithmetical functions.</p> |
