80 (eighty) is the natural number following 79 and preceding 81. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 79 (seventy-nine) is the natural number following 78 and preceding 80. ... 81 is the natural number following 80 and preceding 82. ...

← 80 81 82 83 84 85 86 87 88 89 → 79 (seventy-nine) is the natural number following 78 and preceding 80. ... 81 is the natural number following 80 and preceding 82. ... 82 is the natural number following 81 and preceding 83. ... 83 (eighty-three) is the natural number following 82 and preceding 84. ... 84 (eighty-four) is the natural number following 83 and preceding 85. ... 85 is the natural number following 84 and preceding 86. ... 86 (eighty-six) is the natural number following 85 and preceding 87. ... 87 (eighty-seven) is the natural number following 86 and preceding 88. ... 88 (eighty-eight) is the natural number following 87 and preceding 89. ... 89 (eighty-nine) is the natural number following 88 and preceding 90. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... List of numbers — Integers This is a list of articles about numbers (not about numerals). ... The integers are commonly denoted by the above symbol. ... 0 10 20 30 40 50 60 70 80 90 → For other senses of this word, see zero or 0. ... This article is about the number 10. ... 20 (twenty) is the natural number following 19 and preceding 21. ... 30 (thirty) is the natural number following 29 and preceding 31. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... Look up seventy in Wiktionary, the free dictionary. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ...
Cardinal	80 eighty
Ordinal	80th eightieth
Factorization
Divisors	1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Roman numeral	LXXX
Roman numeral (Unicode)	LXXX, lxxx
Binary	1010000
Octal	120
Duodecimal	68
Hexadecimal	50
Greek numeral	π´
Hebrew	פ (Pe)

Look up eighty in
Wiktionary, the free dictionary.

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ... Greek numerals are a system of representing numbers using letters of the Greek alphabet. ... The Modern Hebrew language is a Semitic language of the Afro-Asiatic language family. ... Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

In mathematics

The sum of Euler's totient function φ(x) over the first sixteen integers is 80. The first thousand values of φ(n) In number theory, the totient (n) of a positive integer n is defined to be the number of positive integers less than or equal to n and coprime to n. ...

Adding up some subsets of its divisors (e.g., 1, 4, 5, 10, 20 and 40) gives 80, hence 80 is a semiperfect number. In mathematics, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. ...

80 is a Harshad number number in base 10. A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ... Decimal, or denary, notation is the most common way of writing the base 10 numeral system, which uses various symbols for ten distinct quantities (0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, called digits) together with the decimal point and the sign symbols + (plus) and − (minus...

In astronomy

• Messier object M80, a magnitude 8.5 globular cluster in the constellation Scorpius
• The New General Catalogue object NGC 80, a magnitude 12.1 spiral galaxy in the constellation Andromeda
• The Saros number of the solar eclipse series which began on 333 BC June 13 and ended on 929 July 9. The duration of Saros series 80 was 1262.1 years, and it contained 71 solar eclipses. Further, the Saros number of the lunar eclipse series which began on 121 BC January 27 and ended on 1213 April 6. The duration of Saros series 80 was 1334.2 years, and it contained 75 lunar eclipses.

The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... Globular Cluster M80 Globular Cluster M80 (also known as Messier Object 80 or NGC 6093) is a globular cluster in the constellation Scorpius. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The Globular Cluster M80 in the constellation Scorpius is located about 28,000 light years from the Sun and contains hundreds of thousands of stars. ... This article is about the star grouping. ... This article is about the constellation. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... It has been suggested that spiral nebula be merged into this article or section. ... Andromeda (IPA: ) is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in Greek mythology. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the 1999 eclipse. ... Centuries: 5th century BC - 4th century BC - 3rd century BC Decades: 380s BC 370s BC 360s BC 350s BC 340s BC - 330s BC - 320s BC 310s BC 300s BC 290s BC 280s BC 338 BC 337 BC 336 BC 335 BC 334 BC - 333 BC - 332 BC 331 BC 330... is the 164th day of the year (165th in leap years) in the Gregorian calendar. ... Events Emir Abd-ar-rahman III of Cordoba declares himself caliph. ... is the 190th day of the year (191st in leap years) in the Gregorian calendar. ... Time lapse movie of the 3 March 2007 lunar eclipse A lunar eclipse occurs whenever the Moon passes through some portion of the Earths shadow. ... Centuries: 3rd century BC - 2nd century BC - 1st century BC Decades: 170s BC 160s BC 150s BC 140s BC 130s BC - 120s BC - 110s BC 100s BC 90s BC 80s BC 70s BC Years: 126 BC 125 BC 124 BC 123 BC 122 BC - 121 BC - 120 BC 119 BC... is the 27th day of the year in the Gregorian calendar. ... May 30 - Battle of Damme; English fleet under William Longsword destroyes a French fleet off the Belgian port in the first major victory for the fledgling Royal Navy. ... is the 96th day of the year (97th in leap years) in the Gregorian calendar. ...

In other fields

Element 80: Mercury (Hg)

Eighty is also: Image File history File linksMetadata Download high resolution version (1268x1012, 224 KB) Summary Picture I took of a small puddle of the element mercury. ... Image File history File linksMetadata Download high resolution version (1268x1012, 224 KB) Summary Picture I took of a small puddle of the element mercury. ... General Name, Symbol, Number Mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12 (IIB), 6 , d Density, Hardness liquid 13. ...

• The number worn by professional football player Jerry Rice.
• The atomic number of mercury
• A cross-country interstate in the United States
• Iowa 80 truck stop, the world's largest truck stop
• the number of units in a fourscore
• the age at which one becomes an octogenarian
• in the title of Around the World in Eighty Days by Jules Verne
• in the title of the film "Star 80" (1983) starring Mariel Hemingway
• in the title of the film 80 Steps to Jonah (1969) starring Wayne Newton
• the model number of the computers TRS-80, Sinclair ZX80, and Aster CT-80
• the model number of:
  • T-80, a Soviet tank
  • IAR 80, a Romanian WWII fighter aircraft
  • McDonnell Douglas MD-80, Arado Ar 80, and F-80 Shooting Star
• part of the name of the bands Eighty-D, Eighty Proof Soul and Element Eighty
• the upper age limit for cardinals to vote in papal elections
• the percentage of consequences that stem from 20% of the causes according to the "80-20 rule"
• the length of a beach in Western Australia: Eighty Mile Beach
• the length of the Eighty Years' War or Dutch revolt (1568-1648)
• the number of the French department Somme
• the designation of Interstate 80, a freeway that runs from California to New York; the European route E80 from Lisbon to Gürbulak
• the standard TCP/IP port number for HTTP connection
• the 80A, 80B and 80C photographic filters correct for excessive redness under tungsten lighting
• The ISBN Group Identifier for books published in the Czech Republic and Slovakia.
• The year AD 80, 80 BC, or 1980.
• The Audi 80, the predecessor to the Audi A4.
• The title of the 8th track on Green Day's second full length album Kerplunk!
• The highest score possible on each of the three sections of the PSAT
• Eighty shilling ale
• Actor Paul Newman earned an Emmy Award for Outstanding Supporting Actor in a Miniseries or TV Movie for Empire Falls in 2005, at age 80
• Jessica Tandy won an Academy Award for Driving Miss Daisy at age 80
• Actor George Burns won an Academy Award for The Sunshine Boys at age 80
• According to Exodus 7:7, Moses was 80 years old when he initially spoke to Pharaoh on behalf of his people.

Jerry Lee Rice (born October 13, 1962 in Crawford, Mississippi) is a former football wide receiver in the NFL. Rice is widely regarded as among the greatest wide receivers in NFL history, consistently showing exceptional performance and strong work ethic on and off of the field. ... See also: List of elements by atomic number In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery Standard atomic weight 200. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... The facility features separate entrances for truckers and regular commuters. ... 20 (twenty) is the natural number following 19 and preceding 21. ... An octogenarian is a person in the age group of 80 to 89 years old. ... Around the World in Eighty Days (French: ) is a classic adventure novel by the French writer Jules Verne, first published in 1873. ... This article is about the French author. ... Star 80 is a 1983 film about the true story of Playboy playmate of the year Dorothy Stratten who was murdered by her estranged husband (Paul Snider) in 1980. ... Year 1983 (MCMLXXXIII) was a common year starting on Saturday (link displays the 1983 Gregorian calendar). ... This article contains a trivia section. ... Carson Wayne Newton (born April 3, 1942, in Roanoke, Virginia) is an American singer and entertainer based in Las Vegas, Nevada. ... This article does not cite any references or sources. ... The Sinclair ZX80 was a home computer brought to market in 1980 by Sinclair Research of Cambridge, England. ... The Aster CT-80, an early home/personal computer developed by the small Dutch company MCP (later renamed to Aster Computers), was sold in its first incarnation as a kit for hobbyists. ... The T-80 is a Soviet/Russian/Ukrainian main battle tank. ... The IAR 80 was a Romanian World War II fighter aircraft, one of the few fighters from a smaller player in the conflict that proved to be as good as the enemy planes it faced. ... The Douglas DC-9 is a twin-engined jet airliner, first manufactured in 1965 and, in much modified form and under a succession of different names, still in production today as the Boeing 717. ... The Arado Ar 80 was a pre-World War II fighter aircraft design by Arado Flugzeugwerke, designed to compete for the Luftwaffes first fighter contract. ... The Lockheed P-80 Shooting Star was the first operational jet fighter used by the United States Army Air Force. ... Element Eighty is a four-piece music group from Tyler, Texas. ... The effects of ageing on a human face Elderly woman Ageing or aging is the process of systems deterioration with time. ... For other uses, see Cardinal (disambiguation). ... The Sistine Chapel is the location of the conclave. ... The misnamed Pareto principle (also known as the 80-20 Rule, the law of the vital few and the principle of factor sparsity) states that for many phenomena 80% of consequences stem from 20% of the causes. ... Eighty Mile Beach at sunset. ... Combatants Dutch rebels Spanish Empire The Eighty Years War, or Dutch Revolt (1568[1]–1648), was the revolt of the Seventeen Provinces in the Netherlands against the Spanish (Habsburg) Empire. ... The départements (or departments) are administrative units of France, roughly analogous to British counties and are now grouped into 22 metropolitan and four overseas régions. ... Somme is a French département, named after the Somme River, located in the north of France. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... Official language(s) English Capital Sacramento Largest city Los Angeles Largest metro area Greater Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ... This article is about the state. ... Europes road system incorporates a series of European routes, which are numbered E1 and up. ... Map of E80 within Portugal, Spain, France, Italy, Croatia, Montenegro, Serbia, Bulgaria and Turkey. ... For other uses, see Lisbon (disambiguation). ... Gürbulak is a town in south-east Turkey, close to the border with Iran. ... The Internet protocol suite is the set of communications protocols that implement the protocol stack on which the Internet runs. ... It has been suggested that this article or section be merged into Computer port (software). ... HTTP (for HyperText Transfer Protocol) is the primary method used to convey information on the World Wide Web. ... In photography, a filter is a camera accessory consisting of an optical filter that can be inserted in the optical path. ... For other uses, see Tungsten (disambiguation). ... The International Standard Book Number, or ISBN (sometimes pronounced is-ben), is a unique[1] identifier for books, intended to be used commercially. ... Events By place Roman Empire The Emperor Titus inaugurates the Flavian Amphitheatre with 100 days of games. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 130s BC 120s BC 110s BC 100s BC 90s BC - 80s BC - 70s BC 60s BC 50s BC 40s BC 30s BC Years: 85 BC 84 BC 83 BC 82 BC 81 BC - 80 BC - 79 BC 78 BC 77... Year 1980 (MCMLXXX) was a leap year starting on Tuesday (link displays the 1980 Gregorian calendar). ... The Audi 80 was an Audi automobile produced from 1966 to 1996. ... The Audi A4 is a compact executive car produced by the German automaker Audi since 1994. ... This article is about the band Green Day. ... Kerplunk! is the second full-length album by punk band Green Day. ... “PSAT” redirects here. ... Scottish cuisine shares much with that of other parts of the British Isles but has distinctive attributes and recipes of its own, thanks to foreign and local influences both ancient and modern. ... This article is about the American actor and race team owner. ... An Emmy Award. ... Empire Falls is a 2001 novel written by Richard Russo set in a fictional small town in Maine. ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... Driving Miss Daisy is a 1987 play by Alfred Uhry adapted into a 1989 Warner Bros. ... George Burns[1], born Nathan Birnbaum (January 20, 1896 – March 9, 1996), was an American comedian and actor. ... The Sunshine Boys is a comic play by Neil Simon. ...

External links

• wiktionary:eighty for 80 in other languages.