 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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 The Nth Prime Page  Andrew Booker
A form into which you can enter a value for n, from 1 to 10^12, inclusive. The server will return the nth prime number (counting 2 as the first). Commas and scientific notation (e.g. 1.0e12) are allowed. Also a Pi function: enter a value for x, from 1
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 numb3rs blog  Mark Bridger, Department of Mathematics, Northeastern University
A blog where math professor Bridger posts mathematical comments on the TV show "Numb3rs". Dating back to February, 2005, posts include "Math and March Madness" and "Random motion and FokkerPlanck" and "Acoustic fingerprints and the JFK assassination"
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 Numbaland  Lomas, Derek; Ching, Dixie; and Sun, Jeanine
Four simple Shockwave Flash games for developing a sense of number concepts: Battleship Numberline (estimating position on the number line), Block Basher (in the style of Tetris, drop blocks of the same color to knock each other out by estimating positions
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 Number2.com  Vincent Crespi, Eric Loken, Josh Millet, and Lesleigh Cushing
Free online SAT, ACT, and GRE test preparation courses. Register for tutorials and practice sessions that dynamically adapt to performance, providing customized feedback for every response and monitoring overall student progress in the coaching system.
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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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 The Number Catcher  INSERMCEA Cognitive Neuroimaging Unit
"Play. Count. Calculate." Learn basic concepts of number and arithmetic, such as concrete sets, digits, number words, base 10, and the logic of multidigit numbers. INSERMCEA Cognitive Neuroimaging Unit also created The Number Race.
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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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 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 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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 The Number Gym  Melvyn Rust, Number Gym Software
Free, interactive, Shockwave Flash numeracy software. These activities are particularly suitable for use with Interactive Whiteboards. There is a full version for sale, as well. Currently this software comprises: 1. Number line activites; 2. Number Grid
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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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 NumberQuotes  Steve Duncan
Enter some digits, and get data containing that number to help put that figure in perspective  or to just associate it with a fun factoid. Learn what cities have your number as a population, or about its purchasing power in dollars. Many fivedigit
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 Numbersense Games  Hassan Baajour, Research Officer
Games for practicing clock time, counting, and more, developed at the London Knowledge Lab (LKL).
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 Number Server  Ben Coffey
A RESTlike service offering a variety of data for decimal and binary numbers: enter a number and get its sine, cosine, tangent, natural logarithm, square root, square, cube, binary, hexadecimal, octal, the singledigit sum of the digits, and more. Output
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 Numbers Test  Tommie Berry
A Java program for teaching children their math facts. Select the digits and functions (addition, subtraction, multiplication, and/or division) you want to practice, and hit the start button. The applet will generate questions for you, will tell you when
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 Number Time  BBC Learning
Learn about numbers and the number system by playing Shockwave games, printing out activities to do away from the computer, watching "Addem" star in fun cartoons that reinforce ideas of quantity; and listening to math songs, accompanied by animation.
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 Number World  David Geistert
Key in any positive integer less than 10^15 and press the "Look up" button for properties about it: factorization, divisors, cross sum, equivalence in multiple bases, and more. Number World's math tools include an equation solver, an equation system solver,
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 The Number Years  Libicki, Quinn
A concept originally created by Eric Libicki as a classroom activity to bring a sense of fun to learning the history of mathematics, now in the game show format presented here. Several online versions are available, and users will be able to craft their
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 Numeracy Games  James Barrett
Flash games in number facts (including funky mummy and brilliant beadstring), counting (funny fingers and duck shoot), bridging through 10 (techno tortoise and +/ number lines), time (hickory dickory and fairy clock), shape and measures (shifting shapes),
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 Numeracy Helper  Educational Computing Support Services
The prime function of this website is to provide software to support teachers and students in the classroom or at home. There are over 75 free interactive online numeracy modules (Year 1 to year 9) with printable work sheets plus answer sheets. There
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 Numeracy Hour Activities  Ambleside Primary School on the Web
Games designed by or with children, and interactive teaching programs to download. Games and activities include Amblegraph (create simple bar charts online); Online Calculator; Analogue Clock (a time teaching tool); Table Trees (multiplication tables);
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 Numerical Integration Tutorial  Joseph L. Zachary
A tutorial that explores rectangular and trapezoidal methods for numerical integration. Includes a Java applet that opens in a separate window, for use alongside the tutorial. From a Computer Science course at the University of Utah, and the book Introduction
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 Numeric Tests Solver  The IQ Challenge
Enter an integer sequence, and this program attempts to determine the next number in the sequence. It
is based on artificial intelligence algorithms.
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 Nummòlt  Maurici Carbó Jordi
Java applets: an area "workshop," which explains area and division by converting numbers in area units; an architect's toy blocks, with gravity; connecting and programming elementary logic (in the form of pipes with light bulbs signifying true sentences);
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 Nummòlt  Maurici Carbó Jordi
Math teaching resources built by architects include base 10 block manipulatives; a block construction toybox; a logic construction toybox; an area workshop; and MathCats balance. See, in particular, Nummòlt's openended obbl & math toys: adding
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 Ohio Proficiency and Graduation Practice Tests  Murtaza Ozdemir, Horizon Science Academy Online
Practice math questions culled from the last four Ohio sixth and ninthgrade proficiency tests or the Ohio graduation test. Users receive a detailed report of their score and a list of missed or skipped questions at the end of the test.
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 Oligopoly/Public Firm Model  Elmer G. Wiens; Egwald Web Services Ltd.
An economic model of an oligopolistic industry with a government firm, oligopoly, interactive and online model, with bonus systems for managers of a
public firm. Application of numerical analysis (Gradient and Newton's
methods to solve systems of
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 Omni Calculator  Piotr Malek
Freely offering calculator apps, as well as the code for calculators to customize and embed in your own website. Calculators for math applications include roots and exponents, percentages, proportions, distances in two and three dimensions, and several
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 On Beyond Newton: from Simple Rules to Stability, Fluctuation, and Chaos (Serendip: Complex Systems)  Bryn Mawr College
An interactive exhibit on homeostasis/autonomy/chaos centered around population dynamics. The phenomenon of rules giving rise to not only order but also disorder, and, beyond that, to previously unknown forms of order, is the terrain currently being explored
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 Online Calculator  Cody Miller
Online Calculator features include: RPN, unit converter, base conversion, polynomial solver, equation solver, complex number support, and decimal to fraction conversion. Site includes reference sheets for algebra, geometry, trigonometry, and calculus
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 Online Clinical Calculator  Division of General Internal Medicine, Medical College of Wisconsin
Includes a Bayesian Calculator (calculates test sensitivity, specificity, predictive values, and likelihood ratios) and numerous clinical formulas (Aa Gradient, Anion Gap, Estimated Blood Level, Body Surface Area, Body Mass Index, Estimated Creatinine
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 OnlineCollegePrep.com  Robert Hackworth
Distance learning courses in reading, writing, math, and study skills. A free online arithmetic course is available for adults needing help to prepare for precollege and collegelevel math instruction. A real instructor instructs and leads the course.
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 Online Conversion  Fogt
JavaScript for converting lengths and distances, temperatures, speed, volumes, weights and masses, computer memory, date and time, cooking, angles, area, power, energy, density, force, pressure, numbers, finance, light, torque, viscosity, frequency, flow
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 Online Conversions  Oren Harhel
JavaScript for converting or calculating greatest common divisors (GCD) and least common multiples (LCM); linear regressions; geometric means; one's complement and two's complement; Roman numerals; means, medians, modes, and ranges; from decimals to fractions,
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 Online Function Grapher  David Bloom
Interactively plot trigonometric functions, inverse and hyperbolic trigonometric functions, logarithm and natural logarithm (ln), square root, and other special functions such as min, max, absolute value.
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 Online games and activities at Syvum  Syvum Technologies, Inc.
Online activities for practicing practice addition, subtraction, multiplication, division, fractions, algebra, and word problems. Workbooktype activities are interactive, with automatic generation of tests, immediate grading, and a new set of problems
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 Online Graphing Calculator: 1Click Delivers Complete Graph  Barry Cherkas, WebGraphing.com
Online graphing calculator with automatically optimized viewing window plus stepbystep details to help answer any graphing questions. Calculus results include determining derivatives and finding local maxima, minima, points of inflection, and more.
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 Online Gröbner Basis Calculations  Michael McGettrick, National University of Ireland
Enter generating polynomials for the ideal I to calculate its Gröbner basis, minimal Gröbner basis, or reduced Gröbner basis, which can be used for finding the solution to simultaneous polynomial equations and for determining the existence
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 Onlineindiaeducation  Atul Mittal
Page after page of questions with links to view answers and explanations: aptitude (area, series, "problems on trains," boats and streams, odd man out, and more), puzzles (sudoku, number, logical, clock, etc.), and reasoning (cause and effect, arithmetic,
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 online intervention.com  Pearson Education
onlineintervention.com assesses students' performance in specific skills and prescribes customized intervention activities, automatically generating summary reports for both teachers and students. Register to take online quizzes, play games, and use learning
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 OnLine Logic Book  Johan Mårtensson
An introductory text, with accompanying Java teaching tools for specific topics. Includes an introduction to logic itself and chapters on ontology and semantics.
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 Online Math Calculator
This collection of free online calculators includes a scientific calculator that accepts inputs of entire matrices and equations, calculates derivatives, and plots functions. Onebutton unit conversion calculators convert between Celsius and Fahrenheit,
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 Online Math Calculator  Tom Flowers, Mintmark.com
A free Webbased math tool: simple calculator with inverse and exponent functions and the four trig functions.
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 Online Math Center  Whatcom Community College, Bellingham, WA
Resources for mathematics students and teachers, including answers to Frequently Asked Questions and online Live Math applications demonstrating algebra, calculus, and linear algebra topics.
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 Online Math Courses  Internet Academy (IA)
Distance learning for high school students, who pay a fee and can obtain credit. Uses Academic Systems software (PC only, no Macs). See the Algebra III Index of Lessons. Includes a Glossary.
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 Online Math Games  Ramona Pasca
Free Flash 6 math games and worksheets.
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 Online Math Tests Home Page  Elias Saab
This site has problems that help sutudents get ready for College Alegbra or Calculus. It also has problems in Geometry and Trigonometry. All the problems have complete solutions that are given when one hits the submit button. Tests covered include: MPE410,
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 Online Matrix Calculator  Trifon Triantafillidis, Bluebit Software
This is an online matrix calculator, featuring Determinant calculation, LU Decomposition, Matrix Multiplication, Matrix Trace, Cholesky Decomposition, Systems of Linear Equations, Matrix Rank, QR Decomposition, Matrix Inverse Singular Value Decomposition,
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 Online Scientific Calculator  Alcula; Giorgio Arcidiacono
An advanced scientific calculator that performs calculations on real or
complex numbers.
The results of expressions are displayed as fractions as well as in their
floating point approximations.
An editable expression history allows to update previous
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