Mathematics Teaching, March 1st, 2006
A 'decimal helical number line' has advantages over conventional number lines and number squares, according to John Harrison.
I believe that a visual image of the number system is helpful to many of us, especially children, in understanding what is, after all, an abstract idea. If this visual image can be given a tangible, concrete form then so much the better. The simplest model is the number line, a row of equally spaced numbers, starting at zero. This illustrates the continuous progression of the natural numbers, moving to the right as the values increase and their indefinite extendibility...
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