 Nikoli  Nikoli Co., Ltd.
From the Japanese magazine publishers that popularized sudoku puzzles: the nikoli.com site releases three or more problems every day  more than 100 new problems a month. Step through tutorials and solve Flash puzzles of Slitherlink, Nurikabe, Heyawake,
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 Nim  Doug Ensley, Shippensburg University
Play online: two people play with several piles of stones. On each move a player
removes as many stones as he or she would like, but forms only one pile. The player who takes the last stone wins.
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 The Nine Planets, a Multimedia Tour of the Solar System  Bill Arnett
An overview of the history, mythology, and current scientific knowledge, with descriptions and data, of each of the planets and moons in our solar system. Each page has text and images, some have sounds and movies, and most provide references to additional
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 Nine Primes in a Row  Ivars Peterson (MathTrek)
...number aficionados Harvey Dubner of New Jersey, Paul Zimmermann of INRIA Lorraine in France, Tony Forbes of Great Britain, and Nik Lygeros and Michel
Mizony of Claude Bernard University in Lyon, France, mounted a campaign and solicited computational
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 NIST Virtual Library (NVL)  National Institute of Standards and Technology
Online library of the National Institute of Standards and Technology. Includes subject guides, an online library catalog, NVL databases, a selection of electronic journals, NIST publications, online resources, global Web resources, and hints and help
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 Nix the Tricks
Problematic vocabulary, notation, mnemonics, and other shortcuts reconsidered and "fixed" by teachers who "want to put a stop to the superficial, cheap tricks that have infected the teaching and learning of math." Submit your own trick, or debate and
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 NOAAServer  National Oceanic and Atmospheric Administration
Search for environmental information on multiple NOAA computers; retrieve data from NOAA's electronic archives; view graphics; and download or order data.
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 The Nobel Prize in Physics – Educational  The Nobel Foundation
Step through explanations of physics concepts, some with Flash activities: explore hidden worlds with microscopes (as developed by laureates Zernike, Ruska, Binnig and Rohrer), look into the interior of matter (from Chadwick to van der Meer), and take
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 No Matter What Shape Your Fractions Are In  Cynthia Lanius
Students explore geometric models of fractions and discover relations among them, reinforcing their knowledge of fractions by using online pattern block activities. The lessons are designed for students to work independently or with guidance from the
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 NonEnglish Math Resources  Math Forum
Students and teachers with NonEnglish language needs will find mathematics and math education Web sites organized by category for the following languages: Spanish, French, German.
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 NonEuclidean Geometry  MacTutor Math History Archives
Covers Euclid's Elements through the end of the 1800's, with 23 references (books/articles).
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 Nonius  Jaime Carvalho e Silva
Nonius  Projecto Computação no Ensino da Matemática  Arquivo Electrónico de Matemática. History of mathematics; mathematics topics, mathematics teaching, technology in teaching, and links to relevant mathematical
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 Nonpartisan Education Review
The Nonpartisan Education Review provides a forum for those interested in education issues but put off by the education policy groups affiliated with the political parties. The groupo aims to make a difference by remaining nonaligned and nonpartisan.
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 Noon Day Project  CIESE Collaborative Projects
Over 2,000 years ago, Eratosthenes made a remarkably accurate measurement of the earth's circumference. This project is a recreation of that experiment and invites the collaboration of students living at different latitudes to take measurements of shadows,
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 The Noon Observation Project  Cathie Godwin, Kathleen Smith; College of Education, Univ. of Illinois at UrbanaChampaign
A joint effort among interested schools worldwide in accurately estimating the circumference of the earth. How to compute local noon at your location; the original 1999 form for submitting Noon Observations; an explanation of the formulas for computing
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 Northeast Regional Climate Center (NRCC)  Department of Soil, Crop and Atmospheric Sciences, Cornell University
The NRCC serves a 12state region that includes Connecticut, Delaware, Massachusetts, Maryland, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and West Virginia, working to acquire and disseminate accurate, uptodate
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 Northwest Math Conference
An annual conference that "brings together mathematics teachers from all levels of primary, secondary, and undergraduate education to learn and share about mathematics and pedagogy." Find information on Northwest Math Conference (NWMC) programs, speakers,
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 Northwest Regional Educational Laboratory (NWREL)
A searchable site whose mission is to improve educational results for children, youth, and adults by providing research and development assistance in delivering equitable, highquality educational programs. NWREL provides research and development assistance
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 Northwest to the Pole and TwoHeaded Coins (Math Chat)  Frank Morgan; Christian Science Monitor
Suppose you start at the earth's equator and travel continuously northwest until you reach the North Pole. What does your path look like? How long is your path?
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 The Norwegian Mathematical Olympiad
Problems and solutions from the Abel Competition, the Norwegian Mathematical Competition (NMC), and the Baltic Way, dating back to 1992, many in English. The Norwegian Mathematical Olympiad is organized by the Norwegian Mathematical Society in cooperation
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 Notation for some Knots (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
It is hard mathematically to completely codify all possible knots. Given two knots, it is difficult to tell whether they are the same. It is harder still to tell for sure that they are different. Many simple knots can be arranged in a form described
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 Not Just Sums  Emily Hillier, Not Just Sums
Teaching and learning resources from the U.K. Learn about the product range and educational philosophy, and try sample resources, a daily starter activity, and online games.
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 Not So Humble Pi  Craig Snodgrass
Humorous wall calendars that run from March to March, in honor of Pi Day, 3/14. Also, buy greeting cards that celebrate pi, and submit your own πku poetry. A portion of all orders goes to the Juvenile Diabetes Research Foundation.
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 NOVA Online: Hunting the Hidden Dimension  Public Broadcasting System (PBS)
The PBS television series NOVA has produced a program about fractals, their impact on the world of mathematics, and the way they're shaping our understanding of nature. In addition to the program itself (in five chapters), the website offers a program
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 NOVA Online: The Proof  WGBH, Public Broadcasting System (PBS)
For over 350 years, some of the greatest minds of science struggled to prove what was known as Fermat's Last Theorem  the idea that a certain simple equation had no solutions. This site includes an interview with Andrew Wiles (the man who spent seven
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 NOVA Podcasting  Public Broadcasting System (PBS)
Podcasts from the producers of the awardwinning science documentary show: NOVA Podcast: expanding on topics from the T.V. programs; NOVA scienceNOW podcast: conversations with scientists and science journalists; NOVA Vodcast: video podcasts; NOVA E
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 Nova Scotia Software Evaluation Reports  Ednet
This evaluation of microcomputer software and multimedia products is coordinated by the Program Branch of the Nova Scotia Department of Education and Culture. The software reviews are published to assist educators in selecting software for use in public
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 NOVA Teachers: Featured Teacher  PBS
Teachers' featured stories of a lesson plan using one of the NOVA films. Lesson titles include: Students Inclined to Study Galileo, Exploring Research Bias, Placing Value on Maya Math, Teaching with Trebuchets, Bridges Form Foundation for Geometry Unit,
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 NRICH Maths, the Online Maths Club  Univ. of Cambridge, UK
A project that aims to establish a permanent national centre for curriculum enrichment to provide mathematical learning support for very able children of all ages. The learning and enjoyment of mathematics are promoted through an Internet Newsletter and
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 NSDL Middle School Portal: Math Pathway  NSDL; the Ohio State University
A middle school portal into NSDL's math resources, browsable by topic, or choose a preselected set of resources on given subjects.
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 n to 0 power  Math Forum, Ask Dr. Math FAQ
Why any number raised to the zero power is equal to one.
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 The Nuffield Foundation
Math teaching and learning resources include freely downloadable Freestanding Mathematics Activities (FSMAs) and Applying Mathematical Processes (AMP) activities, a mix of investigations and practical explorations. The Nuffield Foundation works to improve
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 NUMB3RS  CBS Broadcasting Inc.
NUMB3RS depicts how the confluence of police work and mathematics helps solve criminal questions. Watch video clips of actors Rob Morrow and David Krumholtz on the set, as well as trailers of the television show and previews of upcoming episodes.
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 Numb3rs Math Activities  Cornell Department of Mathematics
Notes and activities on the mathematics behind each CBS television broadcast of the FBI crime series NUMB3RS, from the pilot episode through season five: Uncertainty Principle, Sniper Zero, Dirty Bomb, Assassin, Toxin, Backscatter, Two Daughters, Burn
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 NumberADay  The Mathematical Association of America (MAA)
Every working day, a new positive integer, with a selection of its properties and an illustration or photograph.
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 Number and Word Puzzles  Ken Egan
Number and word puzzles, including Digicross, in worksheet and interactive (Java) format.
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 Number Bases  Math Forum, Ask Dr. Math FAQ
What is base 10? Binary? Hexadecimal? How can you convert from one base to another?
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 Numbercrunch  Simon Pampena
Through school assemblies and other shared learning experiences, Numbercrunch "inspires students by combining energetic standup comedy with mathematics." Believing that "doing maths takes a lot of heart (and a sense of humour)," writer and performer
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 The Number Empire  Vitalii Vanovschi
Enter a positive integer up to 10^12, press the "Go!" button, and The Number Empire states  in yes/no format  whether you entered a prime number, a Bell number, a Catalan number, or a factorial. The same single click displays the integer written out
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 Number Facts  Math Forum, Ask Dr. Math Common Question
A list of sites with facts, curiosities, trivia, and other information about individual numbers.
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 A Number Game  Zusheng Rao
Imagine this interesting game. Given 9 numbers (1,2,3,4,5,6,7,8,9), can you make a number like 1997 by using these numbers and +  * operations without changing their positions? This applet can tell you: put 9 in the column corresponding to "Max Number"
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 Number Glossary  Math Forum, Ask Dr. Math FAQ
What are abundant, amicable, deficient, figurate, happy, narcissistic, palindromic, perfect, polygonal, proper divisors, semiperfect, sociable, square, tetrahedral, triangular, and weird numbers?
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 Number Gossip  Tanya Khovanova
Searchable database up to the number 10,000. Checks more than 40 fun predefined properties of numbers, and shows many original and unique properties of an input number. See also this math coach's math blog, lectures, and more from her home page.
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 Number Guessing  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Think of a number and answer a few questions posed by the computer. After a while the compter will announce your number. The trick is based on a special card design whose variations appeared more than a hundred years ago.
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 Numbering Systems and Place Values  John Knoderer, The MazeMan
Primarily a page about large numbers. Topics covered include: Place Values, ones up to trillions; Place Values, tenths down to trillionths; the American Numbering System; Googol and Googolplex; and the British Numbering System.
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 Numberland  Count On
Number facts and trivia for the numbers 1100. Click on a number from a square to go to a page about that number.
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 numbermaze  Mike Reilly & Jenks Norwalk
A Sudokulike maze puzzle that uses the number pattern from a clock face, one through twelve. Link these numbers in either direction – clockwise or counterclockwise – through the maze to solve the puzzle. Read complete rules, path strategy, hints, and
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 NumberNut.com  Andrew Rader Studios
Introductions to shapes and colors, counting numbers, addition, subtraction, multiplication, division, order of operations, dates and times, number types, fractions, decimals, percents, estimation and rounding, ratios, money math, factors, graphs and
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 Number Of
"You ask, we count": NumberOf.net answers questions that begin "How many ...?" All entries appear in paragraph form that follow a stock template, and link to references. Science entries have enumerated on numbers of breaths per minute, edges on a cylinder,
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 Number Patterns  Harvey Heinz
A brief description of why mathematics is often called the science of pattern followed by examples of a variety of magic squares of various types; examples of orders 5 to 12d magic stars, and selections from Heinz's collection of over 400 number patterns
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