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Numerical digit
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===Digital roots=== {{main|Digital root}} The digital root is the single-digit number obtained by summing the digits of a given number, then summing the digits of the result, and so on until a single-digit number is obtained.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Digital Root|url=https://mathworld.wolfram.com/DigitalRoot.html|access-date=2020-07-22|website=mathworld.wolfram.com|language=en}}</ref>
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