Didactic provision to learn the fundamental notions of calculus, characterized by a board (1) divided into a plurality of contiguous zones (8), of which the two zones (8th, 8c) of the edges have boxes that are divided into each zone in a plurality of rows (9) and that in one edge zone (8th) are numbered consecutively, and in the other edge zone (8c) mainly with cardinal numbers and their multiples, as well as by strips (4) located loosely on the board (1), whose number is equal to the number of rows (9) in each edge area, each strip being able to move along the two corresponding rows located at the same height in the two edge areas, in order to optionally cover one or the other of these rows at least partially, so that the result of a calculation operation carried out in one area or the other can be read in the adjoining still free box next to itthe corresponding end of the strip. (Machine-translation by Google Translate, not legally binding)
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