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Author:Takasugi Shinji
Description: Takasugi's "Number Systems of the World" lists dozens of languages; how to count from zero to one hundred in each; and the mathematical meaning of the expressions for each numeral. For example, the French say "93" with quatre-vingt-treize, which means "4 × 20 + 13," while the Huli speakers of Papua New Guinea, who count in a quindecimal system (base 15), say ngui waraga, ngui kane-gonaga tebira, which means "(15 × 6) + (three objects of the seventh 15)." With references, trees of language families, native speaker population estimates, and geographic areas. The Japanese engineer and recreational linguist's "playground" also includes several mathematical Java applets: "Number Place Puzzle" solves sudoku grids from 4×4 in size to 25×25; "Alphametic Puzzle" deciphers letter-number puzzles such as SEND + MORE = MONEY; and "Mandelbrot Microscope" shows the fractals of the Mandelbrot set and Julia sets.

Levels: Elementary, Middle School (6-8), High School (9-12), College
Languages: English
Resource Types: Problems/Puzzles, Recreations, Web Interactive/Java
Math Topics: Number Sense/About Numbers, Fractals, Linguistics

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