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80 (eighty) is the natural number following 79 and preceding 81.

← 79 80 81 →
Cardinaleighty
Ordinal80th
(eightieth)
Factorization24× 5
Divisors1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Greek numeralΠ´
Roman numeralLXXX
Binary10100002
Ternary22223
Quaternary11004
Quinary3105
Senary2126
Octal1208
Duodecimal6812
Hexadecimal5016
Vigesimal4020
Base 362836

Contents

In mathematicsEdit

80 is:

The Pareto principle (also known as the 80-20 rule) states that, for many events, roughly 80% of the effects come from 20% of the causes.[3][4]

Every solvable configuration of the Fifteen puzzle can be solved in no more than 80 single-tile moves.[5]

In scienceEdit

 
Element 80: Mercury (Hg)

In religionEdit

  • According to Exodus 7:7, Moses was 80 years old when he initially spoke to Pharaoh on behalf of his people. Today, 80 years of age is the upper age limit for cardinals to vote in papal elections.

In other fieldsEdit

Eighty is also:

See alsoEdit

ReferencesEdit

  1. ^ "Sloane's A005835 : Pseudoperfect (or semiperfect) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  2. ^ "Sloane's A000179 : Ménage numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  3. ^ Bunkley, Nick (March 3, 2008). "Joseph Juran, 103, Pioneer in Quality Control, Dies". The New York Times..
  4. ^ "What is 80/20 Rule, Pareto's Law, Pareto Principle". Archived from the original on 2013-01-28. Retrieved 2017-05-20..
  5. ^ A. Brüngger, A. Marzetta, K. Fukuda and J. Nievergelt, The parallel search bench ZRAM and its applications, Annals of Operations Research 90 (1999), pp. 45–63.

External linksEdit