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I SHALL be grateful if you will allow me to communicate, through your columns, to mathematicians generally, but specially to those engaged in teaching arithmetic, two new rules, which effect such a saving of time and trouble that I think they ought to be regularly taught in schools.
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DODGSON, C. Brief Method of Dividing a Given Number by 9 or 11. Nature 56, 565–566 (1897). https://doi.org/10.1038/056565f0
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DOI: https://doi.org/10.1038/056565f0
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