Abstract
There are many good models for the rational numbers-area models, Cuisenaire rods, lattices, for example. Each has its merits and its limitations, and none is so good that it should be used to the exclusion of all others. Indeed, it is partly through a variety of experiences that a person acquires the ability to relate the abstract concept of a rational number to the properties of the practical world. I should therefore like to suggest still another model, one that has certain advantages of its own.
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