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'Napier's Location Arithmetic' printed from http://nrich.maths.org/

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Part One : Work systematically - look at $1$ multiplying something, then at $2$ multiplying the same number, then $3, 4$ and so on.

Part Two : If this wasn't possible to do, how could you show that it was impossible?

Part Three : Start with a smaller version of the same kind of grid, perhaps having only $1, 2$ and $4$ with which to make each factor.