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An educational tool created to help understand how to evaluate numerical expressions walking the number line.

I have been using a non-animated version of this tool, not as a calculator, but to introduce concepts like algorithms and show how our "hero" reacts as different combinations of numbers (1 to 3 for simplicity) and operators (+ and -) are entered.


numberline.apk 1 MB


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Calculator is better

I hope the new description helps ;)