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numerical grouping

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numeral systems

  • Ancient symbols for 1 and 10
    In numerals and numeral systems: Number bases

    …20 occurs chiefly in the score (“Four score and seven years ago…”); in French it survives in the word quatre-vingts (“four twenties”), for 80; other traces are found in ancient Celtic, Gaelic, Danish, and Welsh. The base 60 still occurs in measurement of time and angles.

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