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I have searched and searched but just cannot find a Number Balance. Remember them from your childhood? It's just a plastic balance scale with numbers for weights, but these numbers are balanced so that a two and a three on one side will be equal in weight to a five on the other. I'm sure that it would be just the thing to help my youngsters grasp the concept of addition and subtraction, negative and positive numbers, even infinity...but I just haven't been able to locate one. Can anyone suggest either a catalog or a resource? It would be much appreciated!
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