 XLPrep.com  BerryLime.com, LLC
Online service designed to improve your score on the math portion of the SAT, GMAT and CAHSEE. It features over 300 SATtype questions with changeable numbers, for practice; timed tests to simulate the actual SAT experience; and recordkeeping features
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 Xmorphia  Roy Williams
Pattern formation from differential equations  an exhibition of images and movies. Morphogenesis from a ReactionDiffusion System: Xmorphia is intended to show the variety of patterns that may be exhibited by a relatively simple parabolic partial differential
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 XNumber World  James Redin
With the Extended Numerical Keyboards with Structured DataEntry Capability method, enter a number in the same way as you think on the number; for example, input one million and fiftyseven with the four keystrokes 1, million, 5, and 7, in that order.
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 XP Math: Careers Database  Tak L. Hui
Designed to help students explore a wide variety of jobs that require mathematics, this database includes descriptions for the hundreds of kinds of jobs held by most of the American work force, and is searchable by math topic or industry sector. The job
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 XP Math  Tak L. Hui
Features include free materials designed to excite learners in mathematics and technology, a free eBooks
library, a collection of math sites, a database of mathematical careers, an interactive math games league and an active forum.
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 XPower Interactive: Educators' Edition  Solutions in Mathematics
XPower Interactive is a full 10 chapter Algebra I multimedia course. XPower reinforces algebra concepts with 3D adventures, mathematical games, interactive tools, handson labs, and much more. For Mac or PC.
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 XPress Formula Editor & Problem Solver  HALOMDA Educational Software
A formula editor and symbolic calculator that enables Graphical WYSIWYG editing of math expressions, drawing graphs, and performing algebraic transformations. Expressions can be copied into Word and solved numerically/symbolically step by
step. For
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 xThink  xThink Corporation
The xThink Calculator recognizes and solves math problems written on pen and tablet; MathJournal also interprets such handwritten mathematics, as well as solves integrals and derivatives, manipulates symbolic math, plots 2D and 3D graphs, outputs to MathML,
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 Xtoys  Michael Creutz
Download cellular automata simulators for the Xwindows operating system, or a PostScript document describing them. See also the gallery of examples.
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 XtraMath
A free web program for students, teachers, and parents that helps kids master basic math facts. XtraMath offers students its adaptive supplemental math activities for use in class or at home, along with a progress reporting system for teachers and parents.
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 x, why?  Chris Burke
A "weblog of mathrelated cartoons and images, math humor and general math discussion." This New York City high school teacher's punfilled posts date back to May, 2006: "Why Math Teachers Hate English Majors," "Imperial Unit," "The 0'Factor, episode
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 xyAlgebra  John C. Miller, The City College of The City University of New York
Download xyAlgebra for interactive instruction and practice in algebra, or xySolver for interactive instruction and practice in verbal problems. These two student programs include explanations of principles of basic algebra, stepbystep sample problems,
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 The XY Chart  Speier Associates
A multiplication table that incorporates the Cartesian coordinates, and aspects of Piet Mondrian's designs for an aesthetically pleasing appearance, to teach elementary school students concepts of multiplication, Cartesian coordinates, arithmetic sequences,
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 (x+y)?  Jim Loy
Some people might guess that (x+y)^2=x^2+y^2. But we know that: (x+y)^2 = x^2+2xy+y^2. How do we know that? An application of the distributive law with an illustration and a magic trick...
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 The XYZ GeoBench for experimental geometric computation  Dr. Peter Schorn
The XYZ GeoBench (eXperimental geometrY Zurich) is a workbench for geometric computation on Macintosh computers. It provides an interactive user interface similar to a drawing program which can be used to create and manipulate geometric objects such as
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 Yahooligans! School Bell: Math  Yahoo
Yahoo's kids' guide to math sites including topics: Games and Puzzles, Geometry, Homework Help, Just the Facts, Mathematicians, Measurements, and Real World Math.
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 Yahoo! Science: Mathematics: History  Yahoo! Inc.
Searchable math history links: Mathematicians, Pi, and miscellaneous links.
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 Yahoo! Science: Mathematics: Numerical Analysis: Numbers: Specific Numbers: Pi  Yahoo! Inc.
A searchable collection of approximately 100 WWW pages having to do with Pi, in the following categories: Calculating Pi; Clubs; Decimal Digits; History; Holidays; Mnemonics; Poems; Search Engines; Web Directories.
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 Yahoo! Science: Mathematics  Yahoo! Inc.
All the best on the Web in math including Indices, alphabetically listed by category: Academic Papers; Algebra; Applied Mathematics; Books; Calculus; Chaos; Combinatorics; Complex Systems; Conferences; Education; Employment; Entropy; Equations; Ethnomathematics;
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 Yahoo! Search Options  Yahoo!
Search all of Yahoo by keyword.
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 Yahoo  Yahoo! Inc.
Search the entire Yahoo database or within categories and subcategories. Major categories include Arts & Humanities; Business & Economy; Computers & Internet; Education; Entertainment; Government; Health; News & Media; Recreation &
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 Yarrow Home Page  Jan Zwanenburg
A proofassistant for Pure Type Systems (PTSs). In Yarrow you can experiment with various pure type systems, representing different logics and programming languages. A basic knowledge of Pure Type Systems and the CurryHowardde Bruijn isomorphism is
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 Yellowstone Caldera  Tina DeBuff; Harlowton High School, Harlowton, MT
This Webquest for high school math and science students requires that they make predictions based on historical data about volcanic activity and damage related to the Yellowstone Park Caldera.
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 YERME: Young European society for Research in Mathematics Education
A forum where people who are new to research in mathematics education can communicate with each other, offering support as well as practical advice. Summer schools, contacts, a forum, and conferences and meetings.
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 YMath Mathematical Models  Jan de Koning
Models and building boxes for education include magnetically connectable "mathmaker" and "polylinks," and tetrahedron puzzles. Other polyhedral furniture and housewares include cube moneyboxes of plywood, copper, and brass; dodecahedron bottle openers;
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 Yo: A Math Teacher's Blog  Nico Rowinsky
Blog by the Toronto math teacher who wrote Sally Strange: And How She Learned to Stop Worrying and Love Grade 7 Math. Posts, which date back to September, 2012, have included "Teaching an Old Word Problem New Tricks: PART II," "What happens when you've
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 YoeServ Math Help  Yoe Corporation
Pages that include solutions to problems one might encounter when trying to write a computer program or solve some other problem: Finding out how many digits are in a number; Calculating Zscores by integration; The rules of logarithms; Explicit formula
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 Yo Quiero Math  A Collection of Basic Math Tutorials  Lucila Rios
Tutorials (online videos and practice problems) for adult school students seeking to increase their understanding of basic high school Algebra to enter community college or pass the GED or CAHSEE.
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 You Already Use Metric  Jim Loy
Cases where the metric system is already in use in the United States.
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 You Can Do The Rubik's Cube  Rubik's, Seven Towns Ltd.
The You CAN Do the Rubik's Cube Solution Kit offers teachers lesson plans, homework sheets, and answer keys aligned to national standards as well as 19 state frameworks, anchors and 21st Century Skills. Lessons and activities support Geometry, Algebra
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 You Can Understand Mathematics  Stratford Educational Institute
MATH 2000': a 7lesson distance education program that explains difficult college level ideas in terms of an overview or background presentation that students can use to help them understand many of the concepts in their high school math courses.
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 You Have Found The Prisoners' Dilemma (Serendip: Playground)  Bryn Mawr College
Play a nonzerosum game where the best strategy for a given player is often one that increases the payoff to one's partner as well. The rules: on each turn of the game, you and your opponent must choose, without knowing the other's choice; following
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 Young Children  National Association for the Education of Young Children
The bimonthly, peerreviewed journal of the NAEYC, intended to serve teachers, administrators, researchers, and those in related fields. Its website offers an overview of the current issue, a searchable index of article citations and synopses from 1985
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 Young Engineers  The Decade Group
Enrichment courses for children and teenagers using LEGO and K'nex. Sessions such as Big Builders, LEGO Challenge, and GaliLEGO teach basic and complex mathematics, introduce famous scientists, and demonstrate powers and principles of physics. Based in
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 Young Investor  Columbia Management
Information on investing and investments, along with games and puzzles related to investing. Sections for teachers, parents, and students in grades K12.
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 Young Mathematicians' Network
A loose organization of mathematicians in the junior part of their careers. The site includes the newsletter Concerns of Young Mathematicians, with back issues and an interactive newspaper version online; and links to employment, grant, organizational,
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 Young Scholars Program In Discrete Mathematics  Rutgers University
This summer program provides an opportunity for 11th and 12th graders to attend a four week session in discrete mathematics, with a goal of enhancing problemsolving abilities in applying mathematical concepts to a wide range of problems. Cosponsored
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 The Young Women's Online Journal of Teaching and Learning Mathematics  Woong Lim, editor
A studentteacher run journal intended to give students a voice in their education. Features all levels of high school math and some collegiate levels. Past issues available online. The editor writes: "We encourage high school students to write about
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 Your Math Buddy  Sawmill Software
A software application that helps kids with general math. The program is developed for teachers and parents who have students with learning disabilities (LD), and for other students who do not understand basic math addition, subtraction, multiplication,
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 Your Mathematics Society  ChatArea.com
A chat area/forum for all mathematics questions. General mathematics, algebra, calculus, geometry/trigonometry, statistics, calculators, and history of mathematics are covered.
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 YourMathsTutor: Maths Help for Students of All Abilities  Ian David Wild
Articles, practice problems, a bookshop, links and a free forum where maths problems can be discussed. Created primarily to help students studying the for the UK's Key Stage 3, GCSE, AS and A Level mathematics exams.
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 Your Online Exchange to Additional Math Solutions  amaths.com
Tutoring, lessons, and tips for learning math; fun math topics; a marketplace for selling your used textbooks; and bulletin boards for discussion. Designed for students preparing for the GCE 'O' Level Additional Mathematics examination, based on the newly
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 YourTeacher  Classmate, L.L.C.
Hundreds of online math lessons by a former high school math teacher. Search by course, keyword, or textbook. Freely sample some content; subscribe for full access, plus diagnostic pretests, tools to track progress and performance, and grade reports.
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 Youth Accounts  FORUM Credit Union
Financial literacy games, stories, activities, articles, calculators, videos, and other resources  each set to a musical soundtrack  for learning about finance. Children aged 27 learn with Flip and Flop the frogs; eight to twelve yearolds, with
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 Yummy Math  Brian Marks and Leslie Lewis
Topical math activities that relate to happenings in our world. PDFs, Microsoft Word documents, and Excel spreadsheets have offered prompts and tables on topics ranging from the oil spill in the gulf to the Academy Awards; from the Super Bowl to the Chilean
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 Yuri Matiyasevich
Yuri Matiyasevich is best known for finding a negative solution to Hilbert's Tenth Problem, which has applications to the theory of algorithms, algebra, number theory, model theory, proof theory, and theoretical computer science. As well as information
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 Yves Gallot's Proth.exe and Cunningham Chains  Warut Roonguthai
A collection of interesting Cunningham chains of large prime numbers (with a link to an explanation of Cunningham chains), and how to find some of them using Yves Gallot's Proth.exe, a Windows 95/NT program.
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 yyGrams Books: Books, Games, Puzzles  David Zethmayr
Zethmayr presents boundary mathematics to young children, introducing the ideas of logic, proof, and algebra far earlier than is usually attempted. Books, games, and puzzles on this site reinforce these ideas, and Zethmayr presents a seminar and children's
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 Zahlen  Peter Hartmann
A list of many different types of numbers, with references. In German.
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 ZapaGraph  Brain Waves Software
A graphing program for use in the teaching and learning of high school mathematics and Calculus. Features include the ability to transform any
relation, take the nth derivative of any function, and compose any two functions in nine different ways. The
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