 About Big Numbers  Joshua Honigwachs
Explores the world of big numbers, from one thousand to a googol. Identifies
what objects in the universe, from atoms to large scale structures, match these
numbers.
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 Algebra (Seeing is Believing)  De Silva, D'Andreti; ThinkQuest 1997
An algebra tutorial, comprising: mathematical numbers; real number system; numerical representations in algebra (algebraic expressions); algebraic techniques (factoring); quadratic equations and inequalities; graphing (coordinate systems, conic sections,
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 Al Zimmermann's Programming Contests  Al Zimmermann
An "arena where demented computer programmers compete for glory and for some cool prizes." Computationally intensive problems, often involving heuristics, have included "Point Packing," "Retaining Water" (based on magic squares), "Son of Darts," "Topswops"
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 Autograph (Mathematics)  Eastmond Publishing Ltd
Autograph is visualization software that operates in two modes: graphs, coordinates and bivariate data; and singlevariable statistics and probability. Resources include graphs, statistics, screencam demos, Microsoft Word worksheets, PowerPoint presentations,
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 Basic Math Concepts and Fundamentals  R. H. Logan
A series of readings and practice problem activities designed to alleviate "math anxiety," for those planning to take a science course but uncertain about the math preparation. Includes lessons and practice problems. The topics covered are especially
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 BigInteger Arithmetic in BASIC  Sjoerd J. Schaper
A small but complete, free, open source, large integer/big number library in Basic code. Developed under QuickBasic for speed, but just as easily used with Visual
Basic for Win. Some QB number theory sample modules are added, as well as a VBwin cryptographic
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 Cattle of the Sun  Ivars Peterson (MathTrek)
The story goes that Archimedes of Syracuse (287212 B.C.) was annoyed with Apollonius of Perga (262190 B.C.), who had criticized Archimedes' work on the multiplication of large numbers. For revenge, Archimedes devised a fiendish computational problem
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 Collaborative Maths Resources  Collaborative Learning Project
Freely downlaod PDFs of "talkforlearning" lesson plans such as "12 and 24 hour Card Sorting" (clock times), "Buy a Ted" (collect all the parts of a teddy bear, which introduces the concepts such as exact amounts and making change), "Factors Four in
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 Counting by Twos  Ivars Peterson (MathTrek)
How much is a megabyte? Many people don't really know. The problem originated decades ago when computer professionals noticed that 2^10 is very nearly equal to 1,000, and they began using the metric prefix "kilo" to mean 1,024. That was okay when computers
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 Cuisenaire Math  ETA/Cuisenaire
From the makers of Cuisenaire Rods: Connecting Cuisenaire Rods, Cuisenaire Roddles (board games and puzzles that emphasize spatial reasoning skills), Cuisenaire Rods for the Overhead, Magnetic Cuisenaire Rods, and other manipulatives. Publications include
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 Deepwater Horizon Incident  The National Oceanic and Atmospheric Administration (NOAA)
NOAA has put together a site full of resources about the Deepwater Horizon oil spill in the Gulf of Mexico. In the left margin, choose "Information for: Students and Teachers" to access data sets as well as articles for the classroom, such as a Q&A that
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 Dyscalculator  Pind, Pernille; and Bjerre, Erik
A calculator app to help dyscalculics by showing quantities in multiple representations: as digits, as words, and (for comparisons) graphically. Dyscalculator also speaks figures aloud and rounds numbers. Developed for iPhone, iPad, and Android with the
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 Eighth Grade (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering basic arithmetic concepts and methods, for eighth grade.
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 The English Name of a Number  Landon Curt Noll
This program will help people obtain the names of very large numbers. You may enter a number or the power of ten you want. It will give you the name, or the digits, of your number in American or English style.
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 Figure This! Math Challenges for Families  National Council of Teachers of Mathematics (NCTM)
Elementarylevel problems with hints, information about when and why answers matter in the real world, suggestions for getting started, and answers with explanations. A Challenge Index lists problems by topic. Examples include: Line Up! (How long do you
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 The Geometry Pages  Cathi Sanders
Illustrated essays designed to intrigue and inspire you to learn more about geometry and its many applications in art, engineering, science, and more. Includes the following topics: Lines (History, Elements of Geometry, Polygons, Tessellations); Numbers
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 Googol, Googolplex  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about googols and googolplexes, such as who coined the terms, how big they are, whether it is possible to hold a googol in your hands, and more.
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 Googolplex  Frank Pilhofer
The American mathematician Edward Kasner once asked his nineyearold nephew to invent a name for a very large number, ten to the power of one hundred; and the boy called it a googol. He thought this was a number to overflow people's minds, being bigger
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 Got Math?  Dave Radcliffe
Blog by a community college math instructor and selfdescribed "GeoGebra fanatic." Posts, which date back to December, 2010, have included "Stacking cannonballs," "Counting with Integrals," "A Paradoxical Dissection," "Gelfand's Question," "Imagining
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 MegaPenny Project  Kokogiak Media
What would a billion (or a trillion) pennies look like? Find out here, in pages listing data on one to one quintillion pennies. All the pages have tables at the bottom, listing things such as the value of the pennies, size of the pile, weight, and area
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 A Million/Billion Seconds  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about millions and billions of seconds, such as "What is a million seconds in weeks, days, hours, minutes, and seconds?" and "How can I work out the number of seconds since 1980, taking leap years into account?"
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 MinutePhysics  Henry Reich
"Cool physics and other sweet science" instructional videos, most shorter than four minutes long. Reich narrates while sketching stick figures and other simple line drawings on a whiteboard that sometimes also incorporates photos or video clips: "Proof
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 Multi Math  Manuel Perpen
This simulator app provides animated exercises for practicing to multiply and divide by powers of ten.
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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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 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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 Owners of home computers join researchers in cracking problems and crunching data  Ivars Peterson  Science News Online
Owners of home computers have joined researchers in cracking problems and crunching data, searching for signs of intelligent extraterrestrial life, running large models of the world's climate, and carrying on a worldwide effort to identify recordbreaking
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 Palindromic Numbers and Other Recreational Topics  Patrick De Geest
Many odd facts about big (and little) numbers, including circular primes and palindromic triangulars, tetrahedrals, squares, cubes, and primes. Also assorted odd puzzles, etc.
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 Powers of 10  Michael W. Davidson, The Florida State University
This telescoping Java applet illustrates powers of ten. View the Milky Way at 10 million light years from the Earth, move through space towards the Earth in successive orders of magnitude until you reach a tall oak tree  then begin to move from the
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 Powers of Ten  Bruce Bryson
A series of images based on the book Powers of Ten, by Philip and Phyllis Morrison and the Office of Charles and Ray Eames. Each picture's subject is ten times wider or narrower than the next. Images range from quarks at 1016 meters to groups of galaxies
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 PreAlgebra (Middle School Math)  Homeworkhelp.com, Inc.
Free prealgebra lessons on: types of numbers (numbers and their properties, negative numbers); fractions (reducing, multiplying, dividing, adding and subtracting, mixed numbers, comparing fractions, ratios & proportions, percentages, decimals, scientific
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 Prime Numbers and Factoring  Ray Ontko
A collection of links related to prime numbers and factoring of very large numbers, including FAQs from RSA Labs.
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 Roman Numerals  Math Forum, Ask Dr. Math FAQ
Basics: How do I read and write Roman numerals? What are the rules for subtracting letters? How do I write large numbers? Web resources: introductions, charts, calculators, and converters. Calculations: Did the Romans use fractions?
How can I use Roman
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 Scientific Notation  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about scientific notation, using it to write very large or very small numbers, and adding, multiplying, and dividing with the notation.
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 Significant Figures/Digits  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about scientific figures and scientific digits, such as "When are zeros significant and when are they not significant?"
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 studio:ludens  Wouter Walmink and Alexander Rulkens
Free online tools that "let you play with your own creativity," designed by two Dutch industrial and interaction designers in Eindhoven. Create your own patterns with Repper; your own tessellating coasters with Epa:kato; your own fractals and other complex
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 A View from the Back of the Envelope  Mitchell N. Charity
Pages about approximation. Counting by powers of ten includes the "what order of magnitude is ...?" game, illustrated instructions for counting to ten billion on your fingers, and lots of dots  a million dots on one page, and a dot for every second
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 What Is Scientific Notation And How Is It Used?  R. H. Logan, Instructor of Chemistry, El Centro College
A scientific notation lesson that explains how to use scientific notation for: Numbers Greater Than 10; Numbers Less Than One; Numbers between 1 and 10; Division of Exponentially Notated Numbers; Addition and Subtraction Using Exponential Notation. Includes
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 The World of Trotter Math  Terry Trotter, Escuela Americana, San Salvador, El Salvador
A page of problems, problem sheets, and investigations, with links to image files of an inclass math newsletter, Trotter Math News. Of particular interest to the author are numbers: happy and dizzy numbers; palindromes; super squares; perfect, amicable,
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