![]() ![]() Why do we spell 1st, 2nd, 3rd, 4th like this? These numbers are called ordinal numbers. Twelve is the number of divisors of 60 and 90, the second and third unitary perfect numbers ( 6 is the first). 12 is the fifth Pell number (preceded by 0, 1, 2, and 5) as well as the third pentagonal number, and a Harshad number in all bases except octal. 12, as a number with a perfect number of divisors (six), has a sum of divisors that yields the second perfect number, σ(12) = 28, and as such it is the smallest of two known sublime numbers, which are numbers that have a perfect number of divisors whose sum is also perfect. It is equal to the sum between the second pair of twin primes ( 5 + 7), while it is also the smallest number with exactly six divisors ( 1, 2, 3, 4, 6 and 12) which makes it the fifth highly composite number, and since 6 is also one of them, twelve is also the fifth refactorable number. ![]() It is the smallest abundant number, since it is the smallest integer for which the sum of its proper divisors ( 1 + 2 + 3 + 4 + 6 = 16) is greater than itself, and the second semiperfect number, since there is a subset of the proper divisors of 12 that add up to itself. It is the fourth pronic number (equal to 3 × 4), whose digits in decimal are also successive. The Duden (the German standard dictionary) mentions this rule as outdated.ġ2 is the sixth composite number and the superfactorial of 3. ![]() In German orthography, there used to be the widely followed (but unofficial) rule of spelling out numbers up to twelve ( zwölf). Another system spells out all numbers written in one or two words ( sixteen, twenty-seven, fifteen thousand, but 372 or 15,001). This is not a binding rule, and in English language tradition, it is sometimes recommended to spell out numbers up to and including either nine, ten or twelve, or even ninety-nine or one hundred. In prose writing, twelve, being the last single-syllable numeral, is sometimes taken as the last number to be written as a word, and 13 the first to be written using digits. Italian dodici (but in Spanish and Portuguese, 16, and in French, 17 is the first compound number), Japanese 十二 jūni. It is a compound number in many other languages, e.g. Īs mentioned above, 12 has its own name in Germanic languages such as English ( dozen), Dutch ( dozijn), German ( Dutzend), and Swedish ( dussin), all derived from Old French dozaine. The suffix * -lif- has also been connected with reconstructions of the Proto-Germanic for ten. The Lithuanian suffix is also considered to share a similar development. The adjective referring to a group of twelve is "duodecuple".Īs with eleven, the earliest forms of twelve are often considered to be connected with Proto-Germanic * liƀan or * liƀan ("to leave"), with the implicit meaning that "two is left" after having already counted to ten. Similarly, a group of twelve things is usually a " dozen" but may also be referred to as a "dodecad" or "duodecad". The usual ordinal form is "twelfth" but "dozenth" or "duodecimal" (from the Latin word) is also used in some contexts, particularly base-12 numeration. Every other Indo-European language instead uses a form of "two"+" ten", such as the Latin duōdecim. It is sometimes compared with the Lithuanian dvýlika, although -lika is used as the suffix for all numbers from 11 to 19 (analogous to "-teen"). German zwölf), whose Proto-Germanic ancestor has been reconstructed as * twaliƀi., from * twa (" two") and suffix * -lif- or * -liƀ- of uncertain meaning. ![]() It has cognates in every Germanic language (e.g. Such uses gradually disappeared with the introduction of Arabic numerals during the 12th-century Renaissance.ĭerived from Old English, twelf and tuelf are first attested in the 10th-century Lindisfarne Gospels' Book of John. Early Germanic numbers have been theorized to have been non- decimal: evidence includes the unusual phrasing of eleven and twelve, the former use of "hundred" to refer to groups of 120, and the presence of glosses such as "tentywise" or "ten-count" in medieval texts showing that writers could not presume their readers would normally understand them that way. Twelve is the largest number with a single-syllable name in English. It is central to many systems of timekeeping, including the Western calendar and units of time of day and frequently appears in the world's major religions. It is the number of years required for an orbital period of Jupiter. Twelve is a superior highly composite number, divisible by the numbers 2, 3, 4, and 6. 12 ( twelve) is the natural number following 11 and preceding 13. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |