In science
- The atomic number of mercury
| ||||
|---|---|---|---|---|
| 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⟪ | |||
| Egyptian hieroglyph | 𓎍 | |||
80 (eighty) is the natural number following 79 and preceding 81.
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]
Eighty is also:
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.
56 (fifty-six) is the natural number following 55 and preceding 57.
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.
300 is the natural number following 299 and preceding 301.
360 is the natural number following 359 and preceding 361.
500 is the natural number following 499 and preceding 501.
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.
230 is the natural number following 229 and preceding 231.
240 is the natural number following 239 and preceding 241.
