Geodesic
Numbers as visible shapes
The Teaching of Mathematics, XII (2009) no. 1, p. 45 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The aim of this note is to stipulate requirements for number pictures (corresponding manipulatives) in order to make them convenient for visual representation of numbers and arithmetic operations. These requirements are: uniform representing of the unit of counting, respecting of counting by one, projecting of the number value at the first glance, stability of the shape of arrangements, easy way of drawing or completing of arrangements by children, possibility to represent numbers and operations within larger blocks.
Classification : 1AMS00A35 2ZDMF32
Keywords: Number pictures as arrangements of uniform signs, recognition of numbers at the first glance, structuring of arrangements. 
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     title = {Numbers as visible shapes},
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Milosav M. Marjanović; Aleksandra N. Mandić. Numbers as visible shapes. The Teaching of Mathematics, XII (2009) no. 1, p. 45 . http://geodesic.mathdoc.fr/item/TM2_2009_XII_1_a5/