- Freaky Links - Cut the Knot!, Alexander Bogomolny with William A. McWorter Jr.
Mathematics impinges on itself and the sciences in unexpected and bizarre ways. This page is a small illustration of this phenomenon, taking up recreational mathematics and the game of Chinese checkers, the strategy game called Hex, quasigroups, and block
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- Free Daily Sudoku Puzzles
For this canonical puzzle the aim is to fill every square in the 9x9 grid with a number 1-9. Every row, every column, and every 3x3 box must contain the digits 1 through 9. Free Daily Sudoku has online puzzles and daily puzzles by email or RSS feed. Also
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- Free Doughnuts - Web Feats Workshop II
You have a piece of cardboard 24 by 15 inches. Your problem is to figure out how much to cut out of each corner to make the box with the biggest (maximum) volume. Use the applet to explore how changing the size of the cutout changes the box. This workshop
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- Free Math Flashcards, Math Resources, and Math Games - Linda Blumenthal, Thinkwell Corp., NY
Free math resources and educational games, including talking math flashcards. Learn math using a multi-sensory approach.
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- Free Math Help - Florent Gouachon; fmaths.com
Free math lessons and problems from 1st Grade to 11th Grade. Free sign-up required in order to save your work.
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- Free Online Unit Converter
Convert quantities of mass, area, angle, length, volume, pressure, temperature, and data storage by selecting the unit of measures from pull-down menus. This utility from PDFConverter.com also adjusts the current time according to time zones.
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- Free Puzzles - Jimmie Dean
A collection of puzzles and brainteasers, divided into geometry, logic, math, weight, moves, and miscellaneous. Each puzzle includes a hint, and solutions are available through e-mail. Online games and puzzles include a chess knight game and Hangman.
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- Free Teaching Resources - BossBrains
Free resources for educators, including: customizable worksheets, quizzes and timed tests; flash cards; telling time clocks; and AwardMaker (customize and print awards and certificates).
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- Free Test Online
Math and science practice exercises and quizzes for SAT, ACT, Advanced Placement Calculus, GMAT, GRE and CLEP tests.
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- Frequently Asked Questions About Trigonometry - J. David Eisenberg
An interactive site that explains the ideas behind trigonometry. With Java applets for experimenting with triangles and audio files for hearing the pronunciation of trigonometric terms.
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- From Lewis Carroll to Archimedes - Cut the Knot!, Alexander Bogomolny
On March 29, 1879, Vanity Fair began offering its subscribers a new weekly puzzle invented by Lewis Carroll... on March 17, 1953 Frank Gray, a research scientist at Bell Labs, filed patent no. 2632058, for the Gray code encoding
the vacuum tube. An n-digit
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- The Fruit Game
An interactive game in which players take turns removing fruit from the table according to the rules. The player who removes the last fruit from the table loses. Based on the mathematical puzzler known as the game of Nim.
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- Fuel the Brain - Dynamics of Design
Educational games, interactives, printables, teacher guides, articles and tutorials, and seasonal resources. The "inevitable" product of an elementary teacher and her graphic/web designer spouse, Fuel the Brain's most popular Flash games include Jelly
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- Fully Interactive Prime Number Simulation
A primality simulation created from three simple rules: each number N creates a circle with a radius of N; the circumference of each circle is divided by N, creating an arc of length of circumference/N; and each arc makes a complete rotation in N iterations.
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- Fun 4 the Brain - Natasha Oliver
Flash games in addition (snowy fun and farm freakout), subtraction (color your vacation and "Can You Dig it?"), multiplication (ping pong the panda and granny prix), and division (Peabody the Penguin, and Sketch), with self-grading timed quizzes in some
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- Fun and Sun Rent-A-Car - Cynthia Lanius
A Java or print lesson plan: investigate using tables, graphs, and linear functions to solve a real-world problem. Includes teacher notes with standards alignment and procedures.
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- Function Institute (Zona Land) - Edward A. Zobel
Two-dimensional (x,y) functions: linear (slope-intercept, point-slope, and general forms), polynomial (definition, roots, graphs), and exponential (definition, exponential growth, radioactive decay, money matters - simple, compound, and continuous interest,
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- Fundamental Concepts of Fractions - Goalfinder
Commercial interactive fraction animation in Flash format; covers types of fractions, mathematical operations with fractions. Intended to use stories and entertainment to make learning fractions fun.
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- Funderstanding Roller Coaster
Java simulation intended for students who want to design a roller coaster and educators who want to use an interactive activity to simulate the application of physics. Includes information on the following topics: acceleration; centripetal force; energy;
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- Fun Math for Kids from Big Learning - Dr. Karen A. Cole
Real-world applications for elementary school kids--especially designed for parents and kids to explore together. Also great for classroom warm-up activities.
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- Funny Arithmetic - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java game: using arithmetic, logical, and bitwise shift operators and parenthesis, build an arithmetic expression with as many Base digits as specified in the Number of occurrences. Your expression should evaluate to the specified Goal. For example,
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- Fun with Cellular Automata - Mathilde Rufenacht
Java applets such as "pattern calculators" for exploring one-dimensional cellular automata, Conway's game of life, and the skins and furs of animals. Also, use the site to run your own screen savers.
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- Fun with Fractals - Keith Gabryelski
Click in the fractal image to select the area of the fractal you would like to examine; select a location and style for the fractal image by modifing the values in the form.
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- Furbles - Alec McEachran
Furbles are engaging creatures intended to help youngsters engage with probability and statistics--to make concrete the connection between data and the representations of data. It may be used on an interactive whiteboard, and is flexible enough for teachers
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- Future of Leap Seconds - Steve Allen
Allen, an astronomer, discusses leap years, leap seconds -- and how to avoid their use when redefining Coordinated Universal Time (UTC): three pictures that show the situation; elapsed time (JavaScript that shows POSIX's inability to provide an interface
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- g3d 3-Dimensional Graphing Applet - Eugene Agichtein
Currently available functions: sin, cos, tan, acos, asin, atan -arguments in radians; Hyperbolic Functions - sinc, ctan, actan; sqrt, sqr, exp, log, ln. Operators: +, -, /, *, ^ . Graphs are highlighted in red to show contours, and can be rotated by dragging
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- Gadgets - Jan Gombert
Gombert's five "gadgets" provide simple challenges that combine addition, multiplication, and two- or three-dimensional geometry. Balancing Act shows three values on a beam to balance by addition. Make a given perimeter or area by resizing the figure
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- GalaxyGoo
An interdisciplinary, volunteer thinktank dedicated to exploring expressions of science and math with online technologies, for public benefit. Read interviews of scientists; explore math such as the sine curve with Flash, participate in forums and blogs,
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- Gallery of Interactive On-Line Geometry - The Geometry Center
Twelve interactive online geometry programs: WebPisces (compute implicitly defined curves in the plane); Build a Rainbow (a lab that examines a mathematical model of light passing through a water droplet); QuasiTiler (generate Penrose tilings or design
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- Gallery of Mathematical Images - Dept. of Mathematical Sciences, Loughborough University, UK
The Mandelbrot Set (frames from an animation); Quaternionic Fractals (an extension of the complex numbers - Mandelbrot and Julia sets); Hyperspace (4-dimensional structures projected into 3-dimensional space); Molecular Dynamics (images from simulations,
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- The Game of Chaos - Juergen Giesen
This applet performs the following game at varying speeds: Choose a random starting point (o) within the triangle ABC. Roll a die. Connect the point with point A, when you roll 1 or 2; with point B, when you roll 3 or 4; with point C, when you roll 5
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- The Game of Life: (Serendip: Complex Systems) - Bryn Mawr College
Order without a planner: play a Java game about a world consisting of locations that may or may not be occupied by life. At each step, life persists in any location where it is also present in two or three of the eight neighboring locations, and otherwise
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- The Game of Nim Explained - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of the famous game, with a theoretical explanation and extension to other similar games: see also similar Java games: Nimble, Northcott's game, Plainim, the Scoring game, and Turning Turtles.
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- Games2Learn
Vendor of educational games, software, and activities for both parents and teachers. The site may be searched by category (Math, Spatial Learning, Science and Tech, etc.), grade level, game type, or personality profile (Planner, Peacekeeper, Producer,
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- Games and Puzzles - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Almost 40 games or puzzles, with extensive discussions and solutions. Examples include the Monty Hall Dilemma, Lewis Carroll's problem; the game of Nim, the 3 glass puzzle, Northcott's game, the Tower of Hanoi, and many more. Most require a browser capable
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- Games for the Brain - Philipp Lenssen
Race the "IQ Score" clock while playing JavaScript brain teasers such as NumberCruncher (perform arithmetic calculations following order of operations) and Marsmoney (calculate the values of different currencies). The site also features several memory,
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- GAMES Group - The University of Alberta
GAMES is a research group for Game-playing, Analytical methods, Minimax search and Empirical Studies. It produces real-time programs for strategic game such as Amazons, Awari, Checkers, Chess, Domineering, Go, Hex, Lines of Action, Othello, Poker, RoShamBo,
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- Game Theory .net - Mike Shor
Lecture notes, text book reviews, and interactive applets and games, print and online tests and quizzes, a section on game theory in pop culture, and links to other resources on the web.
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- A Gamma Process - Charlie Geyer
An applet that draws a Gamma process, a stochastic process with independent increments.
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- Gary Haynes - Gary Haynes
Course syllabi, lesson plans, homework, and objectives. Visit "Tangrams and Other Games" for an interactive tangram story and a Flash presentation on how to develop an understanding of functions through the use of the motion sensor.
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- Gasoline Sales - Reading a Chart - NASA Lewis Learning Technologies Project
This chart shows the actual and predicted gasoline sales for one year. During which month was there the greatest difference between the predicted and actual gasoline sales? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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- Gateway to Logic - Christian Gottschall; Dept. of Philosophy, Vienna
A collection of Web-based logic programs offering a number of logical functions. Client side processing (requires Java): sparse trees, alpha graphs (Peirce), Begriffsschrift notation (Frege), Polish notation, truth tables, normal forms, miscellaneous
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- Gaussian Integer Calculator - Dario Alejandro Alpern
Applet that evaluates numerical expressions using Gaussian integers, factors Gaussian integers, and evaluates functions, including the greatest common divisor (GCD), modular inversion, and modular exponentiation, among others.
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- GCSE Maths Quizzes - Education Quizzes
Dozens of online maths quizzes to practice concepts tested on the UK's General Certificate of Secondary Education. Choose from receiving the correct answer after each question or seeing incorrectly answered questions again later. Freely sample some of
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- GCSE Maths Tutor
A free maths revision resource for GCSE/Secondary/High School math. The site offers worksheets, interactive programs, videos, a blog, a discussion forum, and more.
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- General Educational Development (GED) - About.com
A guided portal to the world of the GED test. Includes links to the official GED site, free and commercial preparation sites, practice tests, software, courses, and articles. From About.com's Adult/Continuing Education section.
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- Generating Functions - Interactive Mathematics Miscellany and Problems, Alexander Bogomolny
The definition and properties of generating functions with several examples, including variants of coin change, fast algorithm for computing Banzhaf and Shapley-Shubik power indices, covering the chessboard with tromino and more. Many examples are illustrated
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- Generic Two integer variable equation solver - Dario Alpern
Java/JavaScript code that solves Diophantine equations of the form Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0 in two selectable modes: solution only and step-by-step (or teach) mode. With a link to his description of the solving methods.
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- The Genome Multimedia Site - Brandeis University
An interactive course that introduces how some concepts of probability theory (combinatorics, mutation), information theory (bit definition, entropy), alignment theory (programming, scoring, matrices), and statistics (populations and samples, histograms,
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- GeoGebra Central - Guillermo Bautista
A collection of GeoGebra applets dating back to August, 2010: "Systems of Linear Equations," "The Angle Trisector," "Approximating Pi," "Area of a Trapezoid," "Four Leaf Petal," "Polygons with Equal Area," "Tracing the Derivative," "Paper Folding: Locating
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The Math Forum is a research and educational enterprise of the Drexel University School of Education.