 Math Kangaroo  Maria Omelanczuk
Math Kangaroo's international "notselective competition" recognizes all students who participate in its 75 minutelong multiple choice test: "Each participant is seen as a winner and receives recognition and gifts on the test day in March." Open to any
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 The Math League  Conrad, Flegler, Motyka; Math League Multimedia
Math contests for grades 4 through 12, contest problem books, and math educational software for grades 48. Contest results from math league competitions in the U.S. and Canada are posted here.
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 The Math Less Traveled  Brent Yorgey
A blog "dedicated to exploring beautiful mathematics." Posts, which date back to March, 2006, have included "Proof by animation," "The Nuclear Pennies Game," "Recounting the Rationals," "Predicting Pi," "Square roots with pencil and paper," "Irrationality
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 Mathlets for Teaching Elementary Mathematics  Dave Posner
Animated JavaScript applets of visual models to seed elementary students' preendowed "imaginations with images tailored to evoke patterns that are the basis of the elementary mathematics curriculum": base ten counting (grouping by tens, grouping tens
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 Math Made Simple  Tom Henry
Videos that explain math concepts and then provide stepbystep solutions to example questions. Lessons cover prealgebra, algebra, trigonometry, exponents and logarithms, permutations and combinations, sequences and series, coordinate geometry. Each
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 Math  Melody House  Melody House
Educational recordings, counters, sorting trays, toy coins, and other colorful manipulatives from the publishers of Jump into Math by Rae Pica, Moving To Math by Pam Schiller, Math in Minutes by Sharon McDonald, and Math All Around Me and Learning Rocks
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 Math Mentor Take the Test  Santa Clara County Office of Education
For students preparing to take the California High School Exit Examination (CAHSEE) in math: answer a sample question on your own; watch a math mentor solve the same problem; and review a stepbystep solution. The movies of Englishspeaking and Spanishspeaking
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 Math Movement  Tim Chartier
Blog that focuses on mathematics and the "progress or movement" that occurs in Chartier's teaching, research, writing, and performing. An Associate Professor of Mathematics at Davidson College, Chartier has trained at Le Centre du Silence mime school
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 Math Parent Handbook: A Guide to Helping Your Child Understand Mathematics  Patsy F. Kanter
Organized into sections such as Math in the Home; Mathland: The Grocery Store; and Math on the Go. Appendices include Parents and the Schools; What Should I Expect from a Math Program? and What We Can Do To Help Our Children Learn? With activities for
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 The Math Place  Frank Sobierajski and Mickey Jo Sobierajski
Narrated PowerPoint presentations, problems, and video files of student solutions  some with references to versions published in journals such as Mathematics Teacher and supporting documents such as Geometer's Sketchpad sketches: Newton's Square Root
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 Math Playground  Math Advantage Learning Center
A mathematics learning site for students in grades K6. Math Playground is a teacher created learning site that features interactive word problems, Flash movies, games, quizzes, thinking blocks, flashcards, math worksheets, and manipulatives.
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 Math Puzzle of the Week  Ed Pegg, Jr.
A site that celebrates math puzzles and mathematical recreations. Ed Pegg is a twentyyear member of the National Puzzler's League, and frequently contributes to the New York Times crossword, Games magazine, and National Public Radio's Sunday Puzzler.
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 Math Reasoning Inventory  Scholastic
An online formative assessment tool for the Common Core State Standards (CCSS) math domains of number and operations. Watch Math Reasoning Inventory (MRI) clips of facetoface interviews of students as they reason and explain their strategies, demonstrate
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 MathResources247.com  Ampac Enterprises, LLC
Educational math toys, games, activities, and teaching supplies such as MathSafari, Hot Dots, Math Ad Libs, overheads, geoboards, algebra tiles, balances, and play money (realistic looking coins).
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 Maths & Numeracy Games  Keen2Learn
Increase understanding and build up speed in preparation for tests, SATs, 11+ and GCSE exams with Keen2Learn's maths and numeracy games on adding and counting, algebra, division and multiplication, fractions, numbers, percentage, shape and space, subtraction,
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 The Maths Igloo  Ian Lynagh
Contents: Pi (generating Pi and where you can get it on the 'net); Four plus five (it's nine, isn't it. Or is it?  binary, hexadecimal); All about logarithms; About the Mathematical symbol "e".
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 MathStar New Mexico  New Mexico State University
A professional development program for math teachers that incorporates the principles of Japanese lesson study. Watch QuickTime video clips of lesson study; download PDFs of research lessons on number and operations, algebra, geometry, measurement, and
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 Math Stuff  The Connaissance Museum; ThinkQuest 1996
Tutorials/definitions of math terms and concepts in Arithmetic; Algebra; Geometry; Trigonometry; Calculus; and Helpful Tables and Graphs. Also The Famous Dictionary of Mathematics  math terms for help in doing homework, from abscissa, acute, and additive
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 Math Teaching Videos  Colleen King
Macromedia Flash "videos" of problems being solved; students are invited to solve problems themselves following the given example, and then to make up and submit problems of their own. New videos appear each week. The goal of this program is to encourage
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 Math Terms  Math Forum, Ask Dr. Math FAQ
Why was the letter m selected to represent slope? What's the name of the "fraction bar"? What are some sources of information about math terms and symbols?
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 Math Toys, Presented at NCCE and NECC  Adam Rabinowitz
Excel documents for math, in the following subjects: number sense (addition and subtraction, multiplication and division), patterns and geometry, and portions (fractions, decimals, perecnts).
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 Math Trails in Ottawa  Ivars Peterson (MathTrek)
A math field trip to the National Gallery of Canada, where students followed a detailed itinerary with a variety of mathrelated activities including estimation, symmetries, magic squares, and more.
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 Math Video Lessons  Tom Henry
Narrated instructional videos available for purchase. Also available from http://mathmadesimple.com/.
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 Mathville  Courseware Solutions, Inc.
Awardwinning educational math software for children ages 513, for Mac or Windows. Programs: Kidway (8 activities for grades K2 with up to 10 levels of play each), Jungleway (20 math adventures for grades 13), Speedway (16 activities for grades 24),
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 Math  Wonderopolis®
Each Wonder of the Day® includes several paragraphs' overview (Did you know?), modeling suggestions (Try it out!), a vocabulary list (Wonder Words), and other information to stimulate children's curiosity. Share your wonderments, questions, and answers
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 MathWonders, LLC  Amy ClarkWickham
Makers of ClockWise products, which draw on the image of the 12hour analog clock to conceptually unite the decimal (10), duodecimal (12), and sexagesimal (60) patterns that emerge from nature and everyday experience. Purchase the ClockWise system book,
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 Mayan Arithmetic  Steven Fought
A discussion of the importance of the Mayan symbol for zero and a tutorial on adding Mayan numbers by Steven Fought, written when he was a junior at Strath Haven High School in Wallingford, Pennsylvania.
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 Mayan Math  Karen M. Strom
The Mayans devised a counting system that was able to represent very large numbers by using only 3 symbols, a dot, a bar, and a symbol for zero, or completion, usually a shell. Charts here show the number cycle, as well as principles of arithmetic.
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 Memory, Mental Arithmetic, and Mathematics  MacTutor Math History Archives
All the mathematicians whose biographies are given in the MacTutor archive exhibited extraordinary mental powers. This article examines a few mathematicians who showed extraordinary powers of memory and calculating, together with a number of people who
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 Mighty Number
This "search engine for numbers" returns facts about figures, such as its square root, base 10 logarithm, and primality. Mighty Number also writes out quantities in several different languages (English, German, French, Spanish, and Swedish) and represents
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 Mike's Archive of Riddles and Puzzles (MARP)  Michael Winckler
A puzzle of the week, and an archive of more than 120 puzzles and riddles, with solutions, published in Die FreizeitWoche, a weekly webzine for the AG of Prof. Bock at the IWR in Heidelberg.
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 The Million $ Mission  Cynthia Lanius
You have your choice of two payment options on your new job: 1. One cent on the first day, two cents on the second day, and double your salary every day thereafter for the thirty days; or 2. Exactly $1,000,000. (That's one million dollars!) What's the
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 M.I.T. K12 Math Games Lesson Plans  Wendy Huang, MIT Teacher Ed Program Manager
A collection of math games lesson plans to make learning math fun and engaging for middle and high school students. Written by MIT teacher education students.
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 Monthly Themes  NRICH Maths, Univ. of Cambridge
Past problems from the NRICH Online Maths Club, archived by month. Each problem has a symbol indicating the stage, which tells you how little or how much mathematics you need to know to solve the problem but is no indication of its difficulty. The five
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 More than Magic Squares  Ivars Peterson (MathLand)
Peterson writes about magic squares, quoting Benjamin Franklin's interest in them. In addition to giving a few examples, Peterson also mentions Victor E. Hill IV's musing about whether the discoverer of the magic square actually set out to find an example
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 The Most Common Errors in Undergraduate Mathematics  Eric Schechter
Errors in communication: teacher hostility, student shyness, bad handwriting, not reading directions, loss of invisible parentheses, terms lost inside an ellipsis; Algebra errors: sign errors, everything is additive, everything is commutative, undistributed
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 Mostperfect Pandiagonal Magic Squares  Kathleen Ollerenshaw and David Brée
A companion site to the book, which gives a method of construction and enumeration of all pandiagonal magic squares of a class known as Mostperfect. Pandiagonal magic squares have the integers in all rows, all columns, and all diagonals (including the
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 Multimagic squares  carrés multimagiques  Christian Boyer
Multimagic squares are magic squares that remain magic after their numbers are raised to various powers. The largest multimagic square currently known is BoyerViricel's pentamagic square, to the 5th power.
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 Murderous Maths  Kjartan Poskitt et al.
Contents, descriptions of characters, updates, and "extra bits" for the books Murderous Maths; The Essential Arithmetricks; Desperate Measures; Do You Feel Lucky?; Vicious Circles and other Savage Shapes; The Phantom X; The Fiendish Angletron; The GCSE
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 Music through the Curriculum  Phil Tulga
Developers of math programs such as "Math and Music," which teaches students how to "hear" math (what does a fraction sound like? how about a shape?); and "Math, Science and Sound," an assembly and family night program that connects thunder, volcanoes,
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 My Dear Aunt Sally  Ron Larson
The game "My Dear Aunt Sally" reinforces number sense, from single operations on whole numbers to multiple operations on rationals. Features hints; audio in English or Spanish; hundreds of difficulty levels; animations of Aunt Sally and her animal friends;
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 My Magic Square  Michael Dormann
Enter a number from 23 to 100, then press the calculate button to see a completed 4x4 magic square, of which any row, column, diagonal, the center square, and the four corners each sums to the number entered.
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 Names for Numbers  Ivars Peterson (MathTrek)
Once someone discovers an interesting pattern or type of behavior, those particular numbers are likely to earn a collective name. So we have perfect numbers, amicable numbers, lucky numbers, Mersenne numbers, Fermat numbers, Fibonacci numbers, Keith numbers,
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 Napier Bones  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of the Napier bones, simple device for multiplying numbers, here used to demonstrate multiplying in bases other than ten.
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 The Nature of Mathematics  Ouida B. Kinzey; Kodak
A description of how students created a mathematical slide show based on research projects. Colorado State Standard addressed: students develop number sense and use numbers and number relationships in problemsolving situations and communicate the reasoning
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 Nautilus  Nautilus Ventures LLC
An online and print monthly dedicated "to science and its endless connections to our lives." Each issue contains chapters — essays, investigative reports, blogs, fiction writing, games, videos, graphic stories, and other original content —
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 NBA Math Hoops  Big Picture Learning
A card game that leverages the influence that National Basketball Association (NBA) and Women's National Basketball Association (WNBA) stars have on American youth. Gameplay simulates a regulation basketball game, with pairs of students racing against
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 New York Regents Exam Prep Center  Oswego City School District
A site dedicated to assisting high school students in preparing for the "new" New York State Math A Regents Examination. Covers Algebra, Geometry, and Algebra II/Trig. The materials featured for each topic include: general review/formula sheet, Regents
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 Next Generation Preschool Math  WGBH Educational Foundation
"Can engagement with activities in a mediarich curriculum supplement improve lowincome children's early learning of number and equipartitioning?" By developing and evaluating iPad apps for preschoolers, tools for tracking their progress, and guides
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 Nifty Ideas: HandsOn Math Lab  Fran Endicott Armstrong
Rationales, lesson plans, notes, and sample materials for first quadrant graph games (graph hide and seek and collinear game) and skip counting and multiples activities (counting people and hands and fingers, and arithmetic calculator). The triangular
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