Abstract
A computer application, dealing with numbering systems, is presented. This central subject is discussed both as an object for studying and as an integrating theme and an anchor point for several topics belonging to mathematics curricula for ages nine to seventeen. The interest and the importance of such an instrument are discussed, from both the points of view of contents and processes. A general overview of the type of user interface and user interactivity is presented. Some aspects, which characterize the computer as a special instrument to use if and when adequate, are highlighted. The intended positioning of this application concerning pedagogical, didactical, and methodological aspects is referred to. The teacher role is emphasized. Some suggestions of approaches and activities are made explicit and a reference is made to some pilot in-field experiments.
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