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The numdrum is a number line extending from 0-139, which has been given a decimal structure by winding it round a tube in helical form in such a way that there are 10 numbers per turn. This makes the number line continuous , unlike a 100 number square. The surface is dry-wipe and it is accompanied by a manoeuvreable plastic sleeve and an A4 sheet of suggested uses and puzzles to solve.

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