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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...
Duodecimal
[Categories: Numeration]
Duodecimal, sometimes called dozenal, is a base 12 number system.
The Quick Facts about: Dozenal Society of America
Quick Summary not found for this subjectDozenal Society of America and Quick Facts about: Dozenal Society of Great Britain
Quick Summary not found for this subjectDozenal Society of Great Britain promote that a base 12 system is better than the Quick Facts about: decimal
A number in the decimal systemdecimal system mathematically and in many other ways. Since Quick Facts about: 2
The cardinal number that is the sum of one and one or a numeral representing this number2, Quick Facts about: 3
The cardinal number that is the sum of one and one and one3, Quick Facts about: 4
The cardinal number that is the sum of three and one4, Quick Facts about: 6
The 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: 5
The 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: Chepang
Quick Summary not found for this subjectChepang language of Quick Facts about: Nepal
A 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: Moon
Any natural satellite of a planetMoon in a Quick Facts about: year
A 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: month
A time unit of 30 daysmonths in a Quick Facts about: year
A period of time containing 365 (or 366) daysyear, 12 Quick Facts about: hour
Clock timehours on a clock, 12 traditional time divisions in a Chinese day, 12 signs of the Quick Facts about: zodiac
A 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: horoscope
A 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: English
An 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: French
The Romance language spoken in France and in countries colonized by FranceFrench, and Quick Facts about: German
A person of German nationalityGerman, the use of special names for 11 and 12 rather than names based on the Quick Facts about: decimal
A 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: inch
A unit of length equal to one twelfth of a footinches in a Quick Facts about: foot
The foot of a human beingfoot, 12 ounces in a troy pound, 12 Quick Facts about: old British pence
Quick Summary not found for this subjectold British pence in a Quick Facts about: shilling
An English coin worth one twentieth of a poundshilling, 12 items in a Quick Facts about: dozen
The cardinal number that is the sum of eleven and onedozen, 12 dozens in a Quick Facts about: gross
The entire amount of income before any deductions are madegross, 12 gross in a Quick Facts about: great gross
A cardinal number equal to one dozen grossgreat gross, etc.
Decimal Equivalent
10 twelve (or a dozen) 12
100 one gross 12^2 = 144
1000 one great gross 12^3 = 1728
10,000 twelve great gross 12^4 = 20,736
100,000 ? 12^5 = 248,832
1,000,000 ? 12^6 = 2,985,984
15 a dozen and five
3E three dozen and eleven
XEE ten gross eleven dozen and eleven
11E0 one great gross one gross eleven dozen (= the year 2004)
36,X17 three dozen and six great gross ten gross one dozen and seven
Note 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".
Source(s):
http://www.absoluteastronomy.com/encyclopedia/D/Du/Duodecimal.htm
Anonymous
· 1 decade ago
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