100 (number)

100 or one hundred (Roman numeral: Ⅽ) is the natural number following 99 and preceding 101.

In medieval contexts, it may be described as the short hundred or five score in order to differentiate the English and Germanic use of "hundred" to describe the long hundred of six score or 120.

In mathematics

100 is the square of 10 (in scientific notation it is written as 10²). The standard SI prefix for a hundred is "hecto-".

100 is the basis of percentages (per cent meaning "per hundred" in Latin), with 100% being a full amount.

100 is the sum of the first nine prime numbers, as well as the sum of some pairs of prime numbers e.g., 3 + 97, 11 + 89, 17 + 83, 29 + 71, 41 + 59, and 47 + 53.

100 is the sum of the cubes of the first four integers (100 = 1³ + 2³ + 3³ + 4³). This is related by Nicomachus's theorem to the fact that 100 also equals the square of the sum of the first four integers: 100 = 10² = (1 + 2 + 3 + 4)².

2⁶ + 6² = 100, thus 100 is a Leyland number.

100 is an 18-gonal number. It is divisible by the number of primes below it, 25 in this case. It can not be expressed as the difference between any integer and the total of coprimes below it, making it a noncototient. It can be expressed as a sum of some of its divisors, making it a semiperfect number.

List of hundreds of Delaware

A listing of the hundreds of Delaware. Hundreds are unincorporated subdivisions of counties, equivalent to townships in some other states, and were once used as a basis for representation in the Delaware General Assembly. While their names still appear on all real estate transactions, they currently have no meaningful use or purpose except as a geographical points of reference. The divisions, or "hundreds" as they are called, come from the times when Delaware and Maryland were colonial holdings of Great Britain. While Delaware alone retains the use of "hundreds", the origin of most place names in both states can be traced back to the times of British rule.

Hundreds in New Castle County

Hundreds in Kent County

Hundred (county division)

A hundred was an administrative division which was geographically part of a larger region; it was formerly used in England, Wales, South Australia, some parts of the United States, Denmark, Southern Schleswig, Sweden, Finland, Estonia and Norway.

Other terms for the hundred in English and other languages include wapentake, herred (Danish, Norwegian Bokmål), herad (Norwegian Nynorsk), hérað (Icelandic), härad or hundare (Swedish), Harde (German), Satakunta or kihlakunta (Finnish) and kihelkond (Estonian).

In Ireland a similar subdivision of counties is referred to as a barony, and a hundred is a subdivision of a particularly large townland (most townlands are not divided into hundreds).

Etymology

The name "hundred" may be derived from the number one hundred; it may once have referred to an area liable to provide a hundred men under arms, or containing roughly a hundred homesteads. It was a traditional Germanic system described as early as AD 98 by Tacitus (the centeni). Similar systems were used in the traditional administrative regimes of China and Japan.