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<p>[QUOTE=&quot;Mike Margolis, post: 3177823, member: 88401&quot;]Yes but the specific rule is that ONLY ONE smaller number goes to the left to be subtracted. That is in the page of the book that Doug recommends on the history of numbers. They explain why the number is used that way. It&#039;s origin is most likely from notch notation in sheepherding according to the book.[/QUOTE]</p><p><br /></p>

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