 Occurrence of the Conics  Jill Britton
Realworld examples of occurrences of conic sections: ellipses, parabolas, and hyperbolas.
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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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 Odometers and the Place Value Chart (SMILE)  Donna BronsonCochran, George B. Swift School
A lesson designed to teach students to add decimals with the use of the odometer; place given numbers on the place value chart; and add numbers to the millionths on the calculator. From the Arithmetic section of a collection of almost 200 single concept
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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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 Off The Hypotenuse  Glenn Kenyon
Kenyon started this blog in pursuit of "a good discussion of resources, ideas, and innovative ideas for teachers of Algebra." Humorous videos, comic strips, and posts, which date back to March of 2007, have included "Math Lessons learned from Karate,"
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 Oficina Nacional de Estadística  República Dominicana
Información estadística y geográfica de la República Dominicana. Territorio; población; datos por provincia y municipios. (Tables of information about the Dominican Republic, including geography and population, for
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 Of Men, Mathematics, and Myths  Keith Devlin (Devlin's Angle)
"With the Unabomber now firmly implanted in the public psyche as "a mathematician," the caricature of the mathematician as the misunderstood, antisocial loner has received a considerable boost. That much of mathematics these days is done by two or more
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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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 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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 Old and New Arithmetic  Ivars Peterson (MathLand)
"Three merchants have invested their money in a partnership..." This problem appears in a mathematics textbook known as the Treviso Arithmetic. The original book, written in a Venetian dialect, had no formal title, and its author is unknown. Treviso is
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 Oliver Byrne's edition of Euclid  Digital Mathematics Archive, Univ. of British Columbia
An unusual and attractive edition of Euclid was published in 1847 in England, edited by an otherwise unknown mathematician named Oliver Byrne. It covers the first 6 books of Euclid, which range through most of elementary plane geometry and the theory
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 Oliver Knill
Research, teaching, and media by this preceptor in Harvard's math department. Knill began in dynamical systems, tackling first ergodic and spectral theoretical questions, then probability theory and elementary number theory. This led to his "passion for
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 Olympics Resources
Educational activities inspired by the 2002 Winter Olympic and Paralympic Games in Utah.
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 one good thing
Blog by a group of "dedicated, fascinated, hardworking, inspiring" secondary teachers who believe that "every day may not be good, but every day there is (at least) one good thing worth sharing. Here are our stories." Posts, which date back to January,
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 OnePage Proof of Fermat: Critique (Math Chat)  Frank Morgan, MAA Online
Critique the following short proof of Fermat's Last Theorem sent in by
reader Rob Connelly. (In perhaps the biggest mathematics news of the century, Andrew Wiles recently came up with a very long and complicated proof of this 350year old problem.) Answer:
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 One School's Method for Success  Tere Burton
A report prepared as supplementary material to the AFT Professional Educator's Group Online Conference on Block Scheduling April 11, 1995. Outlines advantages and drawbacks of block scheduling.
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 One Trip to the Attic? (Math Chat)  Frank Morgan, MAA Online
In the lobby of a hotel there are three on/off switches. One is attached to a light bulb on the third floor; the other two are attached to nothing at all. You may work the three switches as often as you please. How many times do you need to visit the
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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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 On Four 4s and Speed Limits (Math Chat)  Frank Morgan; Christian Science Monitor
Can you get past 30 in forming numbers 0, 1, 2, 3, ... from four 4s and the standard mathematical operations +,  , x, /, decimal point, square root, powers, and factorial(!)?
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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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 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 Columns (MAA)  Mathematical Association of America
Links to recent articles and archives of past columns from math writers hosted by the MAA: Ivars Peterson's MathTrek and Math Muse; Devlin's Angle; Math Chat, by Frank Morgan; Cut The Knot! by Alex Bogomolny, an interactive column using Java applets;
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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 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 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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 Online Ideas Maths Resources  James Bancroft
Problems in Microsoft Word, HTML, and JPG, organized into general resources; addition and subtraction; multiplication and division; numbers and the number system; fractions, decimals, percentages, ratio, and proportion; real life problems; measure and
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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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 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 Education  Yordan Petrov Petrov
Math tutorials and quizzes, with some math history information as well. Includes a discussion forum. Available in English or Bulgarian.
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 Online Math Games  Ramona Pasca
Free Flash 6 math games and worksheets.
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 Online Math Help for All  Ramachandran Seerangan
Primers and problems, a math dictionary, worksheets organized by grade and concept, and more.
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 Online Math Help & Learning Resources
Learn basic concepts behind arithmetic, algebra, geometry, statistics and set theory. Includes some SAT test preparation help, math games, math worksheets, math riddles, math quotes, math mnemonics and math trivia.
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 Online Math Lab  Eric Bitter, Clovis Unified School District  CAL Online
Modules on fractions, decimals, and percents offer tutorials and problems for students in grades 412.
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 Online Math League
Math contests for schools and individuals. Sample OML's multiple choice tests by downloading PDFs; register online.
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 Online Tutor: Math, Science, Computers, Etc.  Morris Roth
Online tutoring in math, physics, chemistry, biology, computer languages, English, and French. Inperson tutoring in Tulsa, OK.
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 Onlineunitconversion.com
Oover 225,000 conversions, togethr with explanations of their history and use.
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 On Roman Numerals
Learn the basics of Roman numerals and how to write them, from I (1) to M (1,000) and above. Also, submit an Arabic numeral and click to convert it into its Roman numeral equivalent; or vice versa.
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 On the Horizon (OTH)  School of Education, University of North Carolina (UNC)
OTH Online: the electronic version of the print publication, with the full text of prior volume years. Also the HORIZON mailing list, seminars and workshops, conferences, and presentations to explore and extend the educational community's thinking about
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 On This Day in Math  Pat Ballew
Mathematically significant events, births, deaths, and more, posted every calendar day. Ballew's blog reveals his thoughts on teaching math. His links and explanations written using The Geometer's Sketchpad include triangle medians; angle bisectors in
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 OOG: the Object Orientation Game  MCM Productions
MCM Productions' first publicly released software application. This 4in1 tiling puzzle game for the MSWindows environment allows players to test their problem solving ability with over 300 puzzles, including Tangrams, Pentominoes, Hexagons and Polyominoes.
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 .oO worksheeps  Felix Heckert
Generate worksheets of customized math exercises, complete with solutions: basic operations with integers, negatives, and fractions; binomial and quadratic formulas; partial roots; percent calculation; curve sketching; metric; derivations; antiderivatives;
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 Open Directory  Science: Math  Netscape
A comprehensive directory of math sites on the Web, listing links of mathematical interest by general topics, math topic, and site name.
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