EDUCATION MATERIAL FOR TEACHING ARITHMETIC, PARTICULARLY THE CONCEPT OF SIMPLE NUMBERS AND THE ELEMENTARY OPERATIONS OF ADDING AND SUBTRACTING

摘要

the invention relates to a material for teaching purposes.the invention is used for the representation of simple numbersmedium on which are formed in juxtaposition in the unit points,the charts of side by side transparent boxesrectangular grids of 10 squares juxtaposed on two lineson the tiles with the same dimensions, in whichcells of the grids are marked from 0 to 10, successively, for examplepoints, each point covering only a limited part of the window.the invention applies in particular to the teaching of the concept ofmany simple and basic operations of addition andsubtraction.