 Mrnussbaum.com  Greg Nussbaum
Mrnussbaum's Math Lab has games such as Tony Fraction's Pizza Shop; Smart Poll; Cash Out (for practice making change); and Tackle Math Ball, Math Speed, Buffalo Math, and Math Fries (all timed games for practice adding, subtracting, multiplying, and dividing).
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 Mr. Orr is a Geek.com  Jon Orr
Blog by a Chatham, Ontario (Canada) secondary school math teacher. Posts, which date back to February, 2009, have included "Gr. 11 Quadratics Functions in the real world," "Grade 12 – Mind Map for Project," "Grade 9 Pentominoes," "Grade 11 – Exponential
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 Mrs. Cantey  Susan Cantey
Resources for precalculus and calculus, from a teacher at Walnut Hills HS in Cincinnati, Ohio. Advice, information, practice problems, quizzes, and more.
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 Mrs. Cortes' Teacher Resources  Aida Cortes
Colorful monthly math calendars, available in Spanish and English, for interactive white board use (Activeboard™ and Smartboard™). Each seasonally appropriate template, created by a first grade North Carolina teacher native to Colombia, includes
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 Mrs. Glosser's Math Goodies  Gisele Glosser
Interactive math lessons that work online and offline in a Web browser, and provide immediate feedback to students, with in addition Worksheets (on circumference and area; exponents; expressions and equations; integers; Ocean Math; order of operations;
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 Mr. Talbot's Mathematics Page  Roger Talbot; Detroit Catholic Central
Problem of the week (Algebra 2, Precalculus and Calculus), solutions to the 1999 AP Calculus BC Exam, and a selection of sample tests, quizzes, worksheets, labs, and links.
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 M@ths en Prép@  JeanMichel Ferrard; Lycée du Park, Lyon
Pour les élèves des classes préparatoires scientifiques, un abrégé du cours de mathématiques, une collection d'exercices et de problèmes corrigés, et une introduction à Maple. Math taught
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 Mudd Math Fun Facts  Francis E. Su; Mathematics Dept., Harvey Mudd College
A site developed as a resource for professors wishing to enrich their courses with mathematical 'fun facts': more than 100 5minute math tidbits that can be used at the beginning of class to get students interested in mathematics. They are best used in
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 The Mult Applet  Philip Lin
A Java applet for practicing multiplication tables. Tables from 2 to 9 are scrambled and displayed with blanks for the answers. Enter your answers; if you miss any, you get a chance to correct them. If you get them all right the first time, the applet
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 Multicultural Math Fair  Suzanne Alejandre, Frisbie Middle School
Twentynine percent of Frisbie's student population is Limited English Proficient; Arabic, Cambodian, Chinese, German, Indonesian, Korean, Philipino, Polish, Portuguese, Romanian, Samoan, Spanish, Taiwanese, Vietnamese, and Urdu are represented. In 199394
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 Multimagic squares  carrés multimagiques  Christian Boyer
Multimagic squares are magic squares that remain magic after their numbers are raised to various powers. The largest multimagic square currently known is BoyerViricel's pentamagic square, to the 5th power.
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 Multiplication of Decimals  H. B. Meyer, FaustGymnasium Staufen (Mhb)
Interactive training: multiplication of decimals (requires JavaScript). The user has to fill in boxes with proper digits to practice the multiplication algorithm. Problems may be posed either by the user or by the computer. A German version is available.
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 Multiplication Tips  Calculation Tips & Tricks, The Math Forum
Tips contributed by students for multiplying by 5, 9, and 11.
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 Multiply!  Dani Kenli
Enter your name and press the "Click to start" button, then key in the products indicated to compete in this selfdescribed "International Multiplication Championship," which ranks your speed and accuracy in a table of the world's multipliers. Refresh
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 Murderous Maths  Kjartan Poskitt et al.
Contents, descriptions of characters, updates, and "extra bits" for the books Murderous Maths; The Essential Arithmetricks; Desperate Measures; Do You Feel Lucky?; Vicious Circles and other Savage Shapes; The Phantom X; The Fiendish Angletron; The GCSE
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 The Music of the Primes  Marcus du Sautoy
An article on the Riemann Hypothesis, "the greatest unsolved problem of mathematics."
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 MX4002: Algorithms  Ian Craw and John Pulham; University of Aberdeen
Lecture notes, tutorial sheets, exams, and other material provided for a course on algorithms with the objective of exposing the student to a small number of typical methods from a range of different contexts, so as to reveal the type of thinking that
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 My GRE Tutor
Includes hundreds of math questions, ranging from elementary arithmetic to geometry. Answers to questions are fully explained, and the complete GRE practice tests contain math questions, too. Free; login required.
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 MyiMaths  MyiMaths Ltd
A teaching resource comprised of hundreds of interactive lessons, each with dynamically generated activities, games, tools, and questions. See samples and reviews before purchasing a subscription.
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 My Magic Square  Michael Dormann
Enter a number from 23 to 100, then press the calculate button to see a completed 4x4 magic square, of which any row, column, diagonal, the center square, and the four corners each sums to the number entered.
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 My Math Forum  Julien Santini
Discussion forums that concentrate on college and high school mathematics. Santini posts PDFs of two Weekly Problems, one intended for advanced high school students, the other for college students. See also his "250 Solved Problems," with downloadable
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 MyMathTutor.com  Charles Patrick McKeague
A webbased eLearning resource that supplements traditional textbook and classroom learning. Before signing up for this feebased service, demo one of their RealPlayer video tutorials, which show how to solve math problems. Each lesson includes a practice
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 MyTestBook.com
Standardsbased tests and worksheets for grades 15. Free registration required. Worksheet generator for teachers.
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 MyWeblets.com  Math Worksheets for Kids  MyWeblets.com
Free math worksheets for kidsboth premade and randomly generated, with optional answer key.
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 A Nameless Number  Len Smiley
Trianglefree polygon dissections are a variant of the dissection questions of Catalan, Schroeder, and others: In a convex (n+2)gon with n+2 labeled nodes, what is a(n), the number of ways of drawing nonintersecting diagonals so that no triangles are
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 Napoleon's Theorem  Cut the Knot!, Alexander Bogomolny
On the sides of a triangle construct equilateral triangles (outer or inner Napoleon triangles). Napoleon's theorem states that the centers of the three outer Napoleon triangles form another equilateral triangle. The statement also holds for the three
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 NASA KIDS  Science @ NASA
Puzzles, games, and science stories for students in grades 58, from the U.S. National Aeronautics and Space Administration. Students can earn certificates by joining the NASA KIDS Club and completing its learning activities. Mathematics teachers can
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 National Association of Math Circles  Mathematical Sciences Research Institute
In a Math Circle, students and mathematical professionals gather informally to work on interesting problems or topics in mathematics. The goal of this education enrichment is to get students excited about mathematics, giving them a setting (usually after
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 Navworld  Joseph Portney
A center for the art and science of navigation, providing navigational "cerebrations," famous historical accounts, interviews and biographies. See Earthshapes, different ideas of what the earth would look like if it were one of 12 different shapes (physical
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 Network Tutors
Provide online worksheets and learning plans for elementary and middle school students. Provide tutors in all areas up to college level courses. Various plans available.
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 New Mathwright Library  James White; Bluejay Lispware
An Internetbased library of interactive workbooks on topics commonly encountered in undergraduate mathematics, from college algebra and precalculus through multivariable calculus, differential equations, and mathematical modelling. Workbooks, together
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 NewPath Learning
Publishers of handson print and interactive digital learning resources for reinforcement and review. See, in particular, NewPath Learning products for math, browseable by grade and national or state standards. Shop for and purchase Curriculum Mastery®
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 Newton's Castle  Steve Feld
Learn about color, optical illusions, how cars appear to roll uphill on "magnetic mountains," why dogs chase cars, and more; then test your learning with the online quiz. Also, see quotations and a timeline of Newton's life. With a bibliography and webliography.
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 NewtonsWindow.com  Suzanne Sutton
For students, families, teachers, and homeschoolers as they learn and teach math. NewtownsWindow.com offers math challenge excursions online, summer learning activities, and educational gifts and ideas. With suggestions for reinforcing concepts at home,
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 New York Group Theory Cooperative at CCNY
Genetic algorithms, open problems and preprints in combinatorial and geometric group theory, meetings, links, and MAGNUS, a free (GPL) graphically oriented system, based on Tcl/Tk, for computational group theory designed to allow for exploration and experimentation
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 New York Regents Exam Prep Center  Oswego City School District
A site dedicated to assisting high school students in preparing for the "new" New York State Math A Regents Examination. Covers Algebra, Geometry, and Algebra II/Trig. The materials featured for each topic include: general review/formula sheet, Regents
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 New York State Regents Examinations/Tests  New York State Department of Education
Tests and scoring keys, listed according to the subject and date administered, provided in Portable Document Format (.pdf). All three levels of Sequential Mathematics, including language editions in Chinese, Haitian Creole, Korean, Russian, and Spanish.
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 Nick's Mathematical Puzzles  Nick Hobson
A collection of puzzles ranging over geometry, probability, arithmetic,
algebra, calculus, and logic. All require ingenuity, but most require only precollege math. Hints, answers, and fully worked solutions are provided, as well as links to relevant
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 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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 Noetic Learning: Your Online Math Learning Center  Li Kelty, Noetic Learning, LLC
Offers a worksheet generator with online publishing capability, in the basic operations and money. See also Noetic Learning's online programs for gifted elementary students, summer enrichment and learning retention, and math contests. Free samples of
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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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 Nonsexist Solution of the Menage Problem  Bogart, Doyle
A paper that appeared in the American Mathematical Monthly. The ménage problem asks for the number of ways of seating couples at a circular table, with men and women alternating, so that no one sits next to his or her partner. The paper presents
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 North Carolina School of Science and Mathematics (NCSSM) AP Calculus Web Center  John Goebel, Matt Wagers
Available here are postings related to the high school AP calculus program, including a Lesson Center which contains Mathcad® versions of class lectures (Mathcad® 6.0 or later required); Study Aids which provide material useful for AP Calculus exam preparation,
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 The North Carolina State High School Mathematics Contest  John Goebel
Download PDFs of recent contest questions and solutions, and see test statistics and item analysis. Read brief and detailed histories of the contest, rules, and more. The State Mathematics Contest was initiated in 1979 to provide state level competition
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 Northwestern Crows: Using Rational Functions to Investigate the Behavior of Northwestern Crows (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation in which students use rational functions to explore the possible reasons behind the observation that northwestern crows consistently drop a type of mollusk called a whelk from a height of 5 meters.
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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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 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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 The N Queens Problem  Marty Hall
Finding a solution to the NQueens problem for any N greater than or equal to 4 can be done without searching. Determining where each queen should go can be done in constant time per queen, or O(N) altogether. Thus, drawing the board (which is O(N^2))
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