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'100' ('one hundred') (the Roman numeral is C for ''centum'') is the natural number following 99 and preceding 101.

Cardinal	100 one hundred
Ordinal	100th one hundredth
Factorization	$2^2\; cdot\; 5^2$
Divisors	1, 2, 4, 5, 10, 20, 25, 50, 100
Roman numeral	C
Roman numeral (Unicode)	C, c
prefixes	/ (from Greek) (from Latin)
Binary	1100100
Octal	144
Duodecimal	84
Hexadecimal	64
Hebrew	ק (Kuf)

Contents

In mathematics

In science

Astronomy

In other fields

See also

References

In mathematics

'One hundred' is the square of 10 (in scientific notation it is written as $10^2$). The standard SI prefix for a hundred is "hecto-".
One hundred is the basis of percentages (literally "per hundred"), with 100% being a full amount.
It is the sum of the first nine prime numbers, as well as the sum of two prime numbers (47 + 53), and the sum of the cubes of the first four integers (100 = 1³ + 2³ + 3³ + 4³). Also, 2⁶ + 6² = 100, thus 100 is a Leyland number.
One hundred is also an 18-gonal number. It is divisible by the number of primes below it, 25 in this case. But it can not be expressed as the difference between any integer and the total of coprimes below it, making it a noncototient. However, it can be expressed as a sum of some of its divisors, making it a semiperfect number.
100 is a Harshad number in base 10, and also in base 4, and in that base it is a self-descriptive number.

In science

★ 100 is the atomic number of fermium, an actinide

★ 100 degrees Celsius is the boiling temperature of pure water at sea level

Astronomy

The Messier object M100, a magnitude 10.5 spiral galaxy in the constellation Coma Berenices.
The New General Catalogue object NGC 100, a magnitude 13.3 spiral galaxy in the constellation Pisces.
The Saros number of the solar eclipse series which began on 264 May 13 and ended on 1526 June 10 with a duration of 1262.1 years and 71 solar eclipses. Further, the number of the lunar eclipse series which began on 403 November 15 and ended on 1864 April 22 with a duration of 1460.4 years, and 82 lunar eclipses.

In other fields

'One hundred' is also:

★ The number of years in a century

★ A 100 year old person is known as a centenarian

★ The number of runs required for a cricket batsman to score a Century, a significant milestone

★ The number of pounds in an American short hundredweight

★ The number of subunits into which many of the world's currencies are divided; for example, one euro is one hundred cents and one Pound Sterling is one hundred pence

★ The denomination of the U.S. hundred-dollar bill with Benjamin Franklin's portrait; the "Benjamin" is the largest U.S. bill in print

★ The denomination of American savings bonds with Thomas Jefferson's portrait

★ The denomination of American treasury bonds with Andrew Jackson's portrait

★ The number of the first folder of photos in the DCIM folder created by a brand-new digital camera (or after a change of memory card if the camera is set to auto-reset numbering)

★ The number of tiles in a standard Scrabble set

★ In Greece, India and Israel, 100 is the police telephone number.

★ In Belgium, 100 is the ambulance telephone number.

★ In United Kingdom, 100 is the operator telephone number

★ Hundred Days, aka the Waterloo Campaign

★ "The First Hundred Days" is an arbitrary benchmark of a President of the United States' performance at the beginning of his term

★ The record number of points scored in one NBA game, set by Wilt Chamberlain on March 2, 1962

★ 100 is the HTTP status code indicating that the client should continue with its request

★ On ''Star Trek: Deep Space Nine'', "The Hundred" refers a group of 100 young changelings sent out to explore the galaxy.

★ Historical years: AD '100' or 100 BC.

See also

★ Hundred (word)

★ hundred (division)

★ Hundred Years' War

References

★ Wells, D. ''The Penguin Dictionary of Curious and Interesting Numbers'' London: Penguin Group. (1987): 133