Abstract
THE following method of multiplying large numbers together mentally, if new, may interest some of your readers. If it has been published before, I should be glad to learn where it may be found. The process is so simple that, though I have no special gift for mental arithmetic, I was able, almost without practice, to multiply together correctly seven figures by seven, and to write down the result from left to right.
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CUTHBERTSON, C. Mental Arithmetic. Nature 45, 78–79 (1891). https://doi.org/10.1038/045078c0
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DOI: https://doi.org/10.1038/045078c0
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