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所謂"打"是從英文dozen音譯來的.英國以前是用12進位的,舉例來說,一英尺等於12英吋.而dozen就是12進位的產物.若你有興趣知道12進位,以及支持12進位的人士對於12進位的支持理由,可參考以下說明.(裡頭有許多用到dozen的字根)Duodecimal[Categories: Numeration]Duodecimal, sometimes called dozenal, is a base 12 number system.The Quick Facts about: Dozenal Society of AmericaQuick Summary not found for this subjectDozenal Society of America and Quick Facts about: Dozenal Society of Great BritainQuick Summary not found for this subjectDozenal Society of Great Britain promote that a base 12 system is better than the Quick Facts about: decimalA number in the decimal systemdecimal system mathematically and in many other ways. Since Quick Facts about: 2The cardinal number that is the sum of one and one or a numeral representing this number2, Quick Facts about: 3The cardinal number that is the sum of one and one and one3, Quick Facts about: 4The cardinal number that is the sum of three and one4, Quick Facts about: 6The cardinal number that is the sum of five and one6 are factors of 12, it is a convenient number in doing fractions. Compared to factor 2 and Quick Facts about: 5The cardinal number that is the sum of four and one5 in the decimal system, duodecimal seems to be more versatile.Use of the base 12 number system is not common, but at least one example of duodecimal numerals is in use in the Quick Facts about: ChepangQuick Summary not found for this subjectChepang language of Quick Facts about: NepalA small landlocked Asian country high in the Himalayas between India and ChinaNepal. Historically, the Romans, although they counted in base ten, used a duodecimal system to represent fractions.Historically, the number 12 was used in many civilizations. It is believed that the observation of 12 appearances of the Quick Facts about: MoonAny natural satellite of a planetMoon in a Quick Facts about: yearA period of time containing 365 (or 366) daysyear is the reason this number is used universally regardless of culture. Example of such usage include 12 Quick Facts about: monthA time unit of 30 daysmonths in a Quick Facts about: yearA period of time containing 365 (or 366) daysyear, 12 Quick Facts about: hourClock timehours on a clock, 12 traditional time divisions in a Chinese day, 12 signs of the Quick Facts about: zodiacA belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposeszodiac in Quick Facts about: horoscopeA diagram of the positions of the planets and signs of the zodiac at a particular time and placehoroscope, 12 animal signs in Chinese astrology, etc. In many European languages, such as Quick Facts about: EnglishAn Indo-European language belonging to the West Germanic branch; the official language of Britain and the United States and most of the Commonwealth countriesEnglish, Quick Facts about: FrenchThe Romance language spoken in France and in countries colonized by FranceFrench, and Quick Facts about: GermanA person of German nationalityGerman, the use of special names for 11 and 12 rather than names based on the Quick Facts about: decimalA number in the decimal systemdecimal representation (such as twoteen) can be attributed to this rudimentary base-12 mindset.Being a versatile denominator in fraction may explain why we have 12 Quick Facts about: inchA unit of length equal to one twelfth of a footinches in a Quick Facts about: footThe foot of a human beingfoot, 12 ounces in a troy pound, 12 Quick Facts about: old British penceQuick Summary not found for this subjectold British pence in a Quick Facts about: shillingAn English coin worth one twentieth of a poundshilling, 12 items in a Quick Facts about: dozenThe cardinal number that is the sum of eleven and onedozen, 12 dozens in a Quick Facts about: grossThe entire amount of income before any deductions are madegross, 12 gross in a Quick Facts about: great grossA cardinal number equal to one dozen grossgreat gross, etc.Decimal Equivalent10 twelve (or a dozen) 12100 one gross 12^2 = 1441000 one great gross 12^3 = 172810,000 twelve great gross 12^4 = 20,736100,000 ? 12^5 = 248,8321,000,000 ? 12^6 = 2,985,98415 a dozen and five3E three dozen and elevenXEE ten gross eleven dozen and eleven11E0 one great gross one gross eleven dozen (= the year 2004)36,X17 three dozen and six great gross ten gross one dozen and sevenNote that in English we say "a gross of apples", and not "a gross apples". The term per gross (?#8260;144) would replace per cent (?#8260;100).The case for the duodecimal system was put forth at length in F. Emerson Andrews' 1935 book, New Numbers: How Acceptance of a Duodecimal Base Would Simplify Mathematics. Emerson noted that, due to the prevalence of factors of twelve in many traditional units of weight and measure, many of the computational advantages claimed for the metric system could be realized either by the adoption of decimal-based weights and measure or by the adoption of the duodecimal number system. In his book, he suggested and used a script X and a script E, and , to represent the digits ten and eleven respectively, because, at least on a page of Roman script, these characters were distinct from any existing letters or numerals, yet were readily available in printers' fonts. He chose for its resemblance to the Roman numeral X, and as the first letter of the word "eleven".

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