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2. List of ISO 3166 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

   ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes. ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ...

3. ISO 3166-1 alpha-2 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1_alpha-2

   ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They are the most widely used of the country codes published by ISO (the ...

4. ISO 3166-1 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1

   ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .

5. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp .

6. List of U.S. state and territory abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_U.S._state_and...

   ISO 3166 codes (2-letter, 3-letter, and 3-digit codes from ISO 3166-1; 2+2-letter codes from ISO 3166-2) ANSI: 2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2) USPS: 2-letter codes used by the United States Postal Service USCG: 2-letter codes used by the United States Coast Guard (bold red text shows ...

7. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   To "cast out nines" from a single number, its decimal digits can be simply added together to obtain its so-called digit sum. The digit sum of 2946, for example is 2 + 9 + 4 + 6 = 21. Since 21 = 2946 − 325 × 9, the effect of taking the digit sum of 2946 is to "cast out" 325 lots of 9 from it. If the digit 9 is ignored when summing the digits ...

8. Lattice multiplication - Wikipedia

   en.wikipedia.org/wiki/Lattice_multiplication

   As an example, consider the multiplication of 58 with 213. After writing the multiplicands on the sides, consider each cell, beginning with the top left cell. In this case, the column digit is 5 and the row digit is 2. Write their product, 10, in the cell, with the digit 1 above the diagonal and the digit 0 below the diagonal (see picture for ...

9. List of country calling codes - Wikipedia

   en.wikipedia.org/wiki/List_of_country_calling_codes

   Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.