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Roman numerals: 5 & 10: I V X L C D M: 1000 BCE [1] ... 121: Number expressible with two undecimal digits. 125: Number expressible with three quinary digits. 128 ...
In this section, the numerals are in decimal. For example, "5" means five, and "10" means ten. Chinese Abacus or suanpan. A decimal system with two and five as a sub-bases is called biquinary and is found in Wolof and Khmer. Roman numerals are an early biquinary system. The numbers 1, 5, 10, and 50 are written as I, V, X, and L respectively.
The Roman numerals, in particular, are directly derived from the Etruscan number symbols: ๐ , ๐ก , ๐ข , ๐ฃ , and ๐ for 1, 5, 10, 50, and 100 (they had more symbols for larger numbers, but it is unknown which symbol represents which number). As in the basic Roman system, the Etruscans wrote the symbols that added to the desired ...
120 is . the factorial of 5, i.e., ! =.; the fifteenth triangular number, [2] as well as the sum of the first eight triangular numbers, making it also a tetrahedral number. 120 is the smallest number to appear six times in Pascal's triangle (as all triangular and tetragonal numbers appear in it).
Another common way of expressing the base is writing it as a decimal subscript after the number that is being represented (this notation is used in this article). 1111011 2 implies that the number 1111011 is a base-2 number, equal to 123 10 (a decimal notation representation), 173 8 and 7B 16 (hexadecimal).
The symbols for numbers in Romanian texts are the same as those used in English, with the exception of using the comma as the decimal separator and the period or the space (ideally a narrow space) for grouping digits by three in large numbers. For example, in Romanian 1,5 V means one and a half volts, and 1.000.000 or 1 000 000 means one million.
Greek numerals in a c. 1100 Byzantine manuscript of Hero of Alexandria's Metrika. The first line contains the number "อตθฯกฯฯ δ´ ฯ´", i.e. "9996 + 1 ⁄ 4 + 1 ⁄ 6". It features unit fractions and each of the special numeral symbols sampi (ฯก), koppa (ฯ), and stigma (ฯ) in their minuscule forms. Unit fractions were a method to express ...
It is also a star number, a centered tetrahedral number, and a centered octagonal number. A Chinese checkers board has 121 holes. In decimal, it is a Smith number since its digits add up to the same value as its factorization (which uses the same digits) and as a consequence of that it is a Friedman number ( 11 2 {\displaystyle 11^{2}} ).