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Numbers
 Websites presented in alphabetical order 18th Annual Pi Day Celebration 
 This site, created in 2004 for the Pi Day celebration on March 14 (3/14), commemorates π, an irrational real number (approximately equal to 3.14) which is the ratio of a circle's circumference to its diameter. Features a short history of pi, activities, and links to related sites about calculating pi, memorizing pi, and pi humor. From the Exploratorium. http://www.exploratorium.edu/pi/ Topics: Mathematics Last updated Mar 7, 2007 Binary System
Introduction to the binary number system (a base-2 system, with a comparison to the decimal system, which is a base-10 system) and how to convert decimal numbers to binary numbers. Features a description of the conversion process, an online converter, and explanations of the terms bits and bytes. From an electronic discovery and data restoration company. http://www.usbyte.com/common/binarysystem.htm Topics: Mathematics Last updated Jul 12, 2007 Converting Between Binary, Decimal and Hexadecimal
This site "allows you to convert between binary, decimal, and hexadecimal [number] formats. For example, if you want to convert the decimal number 123 to binary and hex, simply type 123 in the textfield labeled decimal and then click the button to the right. The binary and hex values will be displayed in the corresponding textfields." From a computer science professor at Willamette University. http://www.willamette.edu/~gorr/classes/cs130/lectures/BinaryConversion/convert.html Topics: Mathematics Last updated Jul 9, 2007 Fibonacci Numbers and the Golden Section
A fascinating site with mathematical and geometrical facts as well as formulas, history, and diagrams. Find explanations of Fibonacci numbers, methods for constructing golden sections in two or three dimensions, and information about the golden section (or mean or rectangle) in architecture, art, and music. http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fib.html Topics: Mathematics, Mysteries and More Last updated Oct 15, 2009 MegaPenny Project
A site that helps to visualize extremely large numbers, using the common penny. For each quantity, the value, width (side-by-side), height (stacked), thickness, weight, and area (laid flat) are provided. There are also a table of very big numbers, a bonus section ( MegaMoon ) illustrating how large 1,000,000 cows would be, and related resources. http://kokogiak.com/megapenny/ Topics: Mathematics, Science, Science Last updated Sep 19, 2002 On-Line Encyclopedia of Integer Sequences
This searchable database gives detailed identification of integer sequences. Type in a series of numbers and the database will complete the sequence and provide the name of the sequence, along with its mathematical formula, examples of its classificatory structure, references, and links. Also available in French. http://www.research.att.com/~njas/sequences/ Topics: Mathematics Last updated Sep 10, 2001 The Prime Pages: Prime Number Research, Records, and Resources
This site provides a short explanation and history of prime numbers, how to prove primality, and the nature of prime number infinity. Includes charts of the 10 largest known prime numbers and the 10 largest known twin primes, as well as lists of the first 1,000 primes, primes over 20,000 digits, and palindromic prime U.S. ZIP codes. Features a FAQ, a glossary, and related links. From a mathematics professor at the University of Tennessee. http://primes.utm.edu/ Topics: Mathematics Last updated Sep 28, 2008 Zero in Four Dimensions: Cultural, Historical, Mathematical, and Psychological Perspectives
This site explains the history, value of the concept, and symbol of zero, and its role in mathematics. From a professor at the University of Baltimore. http://home.ubalt.edu/ntsbarsh/zero/ZERO.HTM Topics: Mathematics Last updated Mar 20, 2004 |
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