80 (number)

Last updated

79 80 81
Cardinal eighty
Ordinal 80th
(eightieth)
Factorization 24 × 5
Divisors 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Greek numeral Π´
Roman numeral LXXX
Binary 10100002
Ternary 22223
Senary 2126
Octal 1208
Duodecimal 6812
Hexadecimal 5016
Armenian Ձ
Hebrew פ / ף
Babylonian numeral 𒐕⟪

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

Contents

In mathematics

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 15 puzzle can be solved in no more than 80 single-tile moves. [5]

In science

Element 80: Mercury (Hg) Hg Mercury.jpg
Element 80: Mercury (Hg)

In religion

In other fields

Eighty is also:

See also

Related Research Articles

78 (seventy-eight) is the natural number following 77 and followed by 79.

70 (seventy) is the natural number following 69 and preceding 71.

90 (ninety) is the natural number following 89 and preceding 91.

88 (eighty-eight) is the natural number following 87 and preceding 89.

81 (eighty-one) is the natural number following 80 and preceding 82.

84 (eighty-four) is the natural number following 83 and preceding 85.

36 (thirty-six) is the natural number following 35 and preceding 37.

48 (forty-eight) is the natural number following 47 and preceding 49. It is one third of a gross, or four dozens.

54 (fifty-four) is the natural number following 53 and preceding 55.

66 (sixty-six) is the natural number following 65 and preceding 67.

96 (ninety-six) is the natural number following 95 and preceding 97. It is a number that appears the same when turned upside down.

104 is the natural number following 103 and preceding 105.

100 or one hundred is the natural number following 99 and preceding 101.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

300 is the natural number following 299 and preceding 301.

500 is the natural number following 499 and preceding 501.

700 is the natural number following 699 and preceding 701.

10,000 is the natural number following 9,999 and preceding 10,001.

230 is the natural number following 229 and preceding 231.

240 is the natural number following 239 and preceding 241.

References

  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 Research90 (1999), pp. 45–63.