In either case the division reflected the widespread use of a duodecimal numbering system.
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Historically, units of time in many civilizations are duodecimal.
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Languages using duodecimal number systems are uncommon.
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In a duodecimal place system, ten can be written as A, eleven can be written as B, and twelve is written as 10.
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Roman fractions were based on a duodecimal system.
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Thus, in practical applications, the nuisance of recurring decimals is encountered less often when duodecimal notation is used.
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On coins, many of which had values that were duodecimal fractions of the unit as, they used a tally-like notational system based on twelfths and halves.
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In fiction, J. R. R. Tolkien's Elvish languages use a hybrid decimal-duodecimal system, primarily decimal but with special names for multiples of six.
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Anyone having these tables at command will do these calculations more than one-and-a-half times as fast in the duodecimal scale as in the decimal.
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More examples
Based on twelve; "the duodecimal number system"
One-twelfth: one part in twelve equal parts
The duodecimal system (also known as base-12 or dozenal) is a positional notation numeral system using twelve as its base. ...