 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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 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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 A Number of Things  Karyn Vogel
Blog where a K5 Math Coach in Burlington (VT) "shares ideas and resources related to mathematics and education." Posts, which date back to October, 2011, have included "Math and Image," "A new way of problemsolving," "Sugar and Ice book review," "Plus
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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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 Number Puzzles  Ken and Dima Boone
Arithmetic puzzles along with hints and answers include "Laying Eggs," "Four Fours Into Seven," "Target Number 278," "Inserting Plus Signs," and "How Many Legs?" and "What's My Number?"
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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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 NumbersBee  NumbersBee.com
Practice arithmetic by yourself, play with others online, or compete in NumbersBee's national tournament.
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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 Sentences  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about number sentences and other puzzles involving order of operations, such as Four 4's and making 24.
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 Numbers from 1 to 10 in Over 4000 Languages  Mark Rosenfelder
Click on the map to move to the languages for that area, or select from: IndoEuropean, Dravidian, and minor European languages; AfroAsiatic, Caucasian, NiloSaharan, Kordofanian, and Khoisan languages; NigerCongo languages; Uralic, Altaic, Tai, AustroAsiatic
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 Numbers from One to ThirtyOne: A Page for Each Day of the Month  Richard Phillips, Shell Centre for Mathematical Education
Trivia about the calendar numbers one through thirtyone. Based on the book Numbers: Facts, Figures and Fiction, which answers questions such as how Room 101 got its name, what you measure in oktas, and which number links Alice in Wonderland, rainbows
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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 Strings  Imm, Kara; Lambert, Rachel; et al.
A place to find new strings, post strings, get feedback on design or number choice, and discuss the pedagogy of number strings, a classroom routine based on "sets of related math problems, crafted to support students to construct big ideas about mathematics
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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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 NUMDRUM  John T. Harrison
The "Numdrum" helps children understand addition, subtraction, and other fundamental arithmetic concepts. An alternative to the number line and the 10 x 10 number square, this "decimal helical number line" lists integers around a tube, ten to a turn,
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 Numenko  Tom Lennett
An arithmetic crosswordlike game "invented by a father to help his daughter with her maths." Players alternate laying down tiles marked with numbers and operations to form horizontal or vertical number sentences; the resulting sum, difference, product,
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 numeracy  Adult Numeracy Network, Math Forum
A mailing list for those interested in the discussion of educational issues around adult mathematical literacy (ABE/GED/ESL, workplace, and literacy teachers, tutors, and adult learners), maintained by the Adult Numeracy Network (ANN). Read and search
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 Numeracy and Quantitative Literacy  EXTEND  Perspectives in Mathematics Education
Links to articles on diverse views on the quantitative demands of today's society and the relation of quantitative literacy to mathematics education.
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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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 Numicon  Numicon, Ltd.
By representing numbers as shapes, Numicon's teaching program addresses different learning strengths with a multisensory approach. Download free mathematics display resources (for bulletin boards and the like); topics include Numicon shapes, pattern
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 Nummňlt  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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 NurtureMinds.com: Learn Mathematics with the Abacus  NurtureMinds.com
Distributors of the Learn Mathematics with the Abacus book series. Benefits of abacus work and mental mathematics discusses on the site; various packages of the texts for sale.
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 NYC HOLD  Bas Braams and Elizabeth Carson, editors
Honest Open Logical Debate (HOLD) on Mathematics Education Reform addresses mathematics education in the New York City schools. Organized into Issues in Mathematics Education, Curriculum Reviews, Standards, New York City Issues, Call to Action, NYC News
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 nysmmn  Math Forum
The discussion group of the Association of Math Teachers of New York State's Math Mentor Network. This list is specifically for Elementary Math Mentors in the state, but welcomes all who have an interest in elementary math education. Read and search archived
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 Odd Day  Ron Gordon
Mathematical observations, original musings, news coverage, and cartoons in celebration of January 3, 2005 (1/3/5), July 9, 2011 (7/9/11), and other times when three consecutive odd numbers make up the date. Gordon, retired from teaching high school in
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 OER Commons  Institute for the Study of Knowledge Management in Education
An open learning network for teachers and professors to access their colleagues' course materials, share their own, and collaborate. The Open Educational Resources site features tags, ratings, comments, reviews, and social networking functions, as well
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 Ohio Literacy Resource Center  Kent State University
The Ohio Literacy Resource Center provides support, training and resources for the people who work in and attend classes at adult and family literacy programs. The OLRC also works with GED graduates who are attending Kent State University. The site offers
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 Olympics Resources
Educational activities inspired by the 2002 Winter Olympic and Paralympic Games in Utah.
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 One size fits all?  Mike Robison; Mathematics Dept., Michigan State University
Age based tracking versus ability grouping in elementary school mathematics. A research paper on ability and age grouping that reviews the literature and makes suggestions for math education.
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 One, Two.. Infinity  Marian Small
PDFs of presentations from the professional development consultant and author of Making Math Meaningful to Canadian Students K8, More Good Questions: Great Ways to Differentiate Secondary Mathematics Instruction (9  12), Eyes on Math: A Visual Approach
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 One Wolf Howls  Scotti Cohn, illustrated by Susan Detwiler
This children’s book uses the months of the year and the numbers 1 through 12 to introduce children to the behavior of wolves in natural settings. The site also offers free educational resources, including teaching activities, math quizzes, related websites,
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 Online Catalog  Creative Publications
Educational publishers of MathLand (K6) and Mathscape (68) curricula, supplemental resources, and manipulatives. Teachers' lounge, professional development information, workshops and conferences, and product and ordering information.
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 Online Catalog: Math  EvanMoor Educational Publishers
Publishers of math activity and skillbuilding books: practice for basic math concepts and extensions into realworld situations. Activity cards, daily problem solving, word problems and more.
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 Online Class: Internet Education Projects  TBT International, Inc.
A model project to show teachers how to integrate technology into the classroom. Designed so that live, interactive content will draw out technical skills. Subscribe by classroom to receive a printed teachers' resource guide; materials delivered free
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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 Common Denominator  Mathematical Association of Victoria (MAV)
The monthly newsletter of the Mathematical Association of Victoria, Australia providing information for teachers of mathematics. All issues are available online.
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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 Exhibits Hotlist  The Franklin Institute
A list of links to more than 100 online learning experiences for math and science, both interactive projects and exhibits.
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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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 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 Innovation Institute (OII)  Ferdi Serim
The OII provides educators with a learning environment to support integrating the Internet into their individual teaching styles, offering a combination of online and onsite collaborations in which participants develop projects to use in their classrooms.
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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 Math Applications  Leung, Jiang, Jiang, Chiu, Klopfer, Chiu; ThinkQuest Junior
Activities, examples, problems, and online quizzes about math applied to real world situations in investing (a stock market simulation game), music (classical MIDI files), history (biographies and anecdotes), science (astronomy, computers, 'math in the
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