 Growing Exponentially  Heather Kohn
Blog of "reflections on teaching math and striving to do better each day than the last." Posts, which date back to August, 2012, have included "Olympic Fever," "Work in your head, Points in my head," "Graphing Calculator Activities," "Absolute Value Project,"
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 Habits of mind: an organizing principle for mathematics curriculum (Connected Geometry)  Cuoco, Goldenberg, Mark; Education Development Center, Inc. (EDC)
A curriculum the goal of which is not to train large numbers of high school students to be university mathematicians, but rather to allow high school students to become comfortable with illposed and fuzzy problems, to see the benefit of systematizing
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 HandsOn Math Activities for Grades 46  Wendy Sawatzky
Designed for a grade 5 class, but adaptable for grades 4 or 6. Teacher notes and readymade task cards are available for each activity. Topics include numbers and operations, geometry, problem solving, measurement, data management and analysis.
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 Hard Problems  George Paul Csicsery, and the Mathematical Association of America (MAA)
Hard Problems is a feature documentary about the students who represented the United States at the 2006 International Mathematical Olympiad (IMO). The film shows the dedication and perseverance of the six American high school students, the rigorous preparation
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 A Hen and a Half  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about the rate of eggs laid by chickens: "If a chicken and a half lays an egg and a half in a day and a half ..."
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 Heron's Formula  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about Heron's formula, including proofs, derivations, and applications of it.
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 History of Mathematics  Carl Eberhart; Dept. of Mathematics, Univ. of Kentucky, Lexington, KY
Information and Maple worksheets on Egyptian fractions and geometry, Babylonian numeration, Hippias and his Quadratix, cubic equations, trigonometry until Ptolemy, curves, and more. Also examples of student projects. A spring 1999 course on the history
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 HOT Math  Pauline Vos
Handson tasks in the mathematics classroom, a resource site for teachers of students around 14 years of age. Among the topics are angles, symmetry, scale drawing, balance algebra, tables, combinations, statistics, probability, reasoning, finding rules
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 How Many Animals?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions such as "Joe counts 48 heads and 134 legs among the chickens and dogs on his farm...."
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 How Many Handshakes?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions such as "There are 40 people in a room. They shake each other's hands once and only once...."
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 How to Solve the Rubik's Cube v1.4  Mark Jeays
A complete solution to solving the cube from any position, credited to David Singmaster, who wrote the 1980 book Notes on Rubik's Magic Cube, except for Step 2, discovered independently by Mark Jeays.
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 Idea Math
Programs for students in grades 6 through 12 who want "to advance their problem solving skills, both to expand their mathematical horizons, and to maximize their performance in math competitions." Idea Math offers weekends classes (at Lexington High School,
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 Imaginary Numbers in Real Life  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about imaginary numbers in real life, such as where imaginary numbers are used today in real life and who uses them.
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 Impressions from ICME9  Cut the Knot!, Alexander Bogomolny
Statistics on attendance (by country) at the International Congress on Mathematics Education held in Tokyo, Japan in August, and impressions of talks on the state of mathematics education in the year 2000. According to Mogens Niss (Denmark) who gave the
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 Inequalities and Negative Numbers  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about inequalities and negative numbers, such as why to reverse or flip the inequality symbol when dividing or multiplying by a negative number.
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 Infinite Primes  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about whether there is an infinite number of primes, and the frequency of their distribution.
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 Intelligent Tutor Math Educational Software, Inc.
The programs in the Intelligent Tutor software series contain tutorials designed to help students learn and master Grades 712 math subjects. The programs are designed with school versions for use in schools, and home versions for individuals in selfstudy
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 Interactive Games  Cathleen J. Chamberlain and Mark Cogan, Oswego City School District
Design matching games and quizzes. Premade games include Ghost Blasters and Sum Sense, for practicing arithmetic; Banana Hunt, for estimating angle measures; Bang on Time, Class Clock, and Stop the Clock; Billy Bug, for learning coordinates; Fraction
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 The Interactive Mathematics Classroom  Rex Boggs
A digital library of thirdparty technology resources for teaching mathematics, from kindergarten to calculus. Register to comment on interactive whiteboard files, Powerpoints, TINspire documents, Excel spreadsheets, and other digital resources. RSS
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 invention at play  Lemelson Center, Smithsonian National Museum of American History
Rotate and translate the tangramlike pieces of Puzzle Blocks to form the silhouettes shown; arrange the gears, springs, funnels, and other objects of Tinker Ball to divert the falling ball into the target. The Invention at Play exhibition focuses on
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 Inverse of a Function  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about the inverse of a function, how it is used in real life, whether or not the inverse of a function is itself a function,
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 Investigations in Mathematics  Eric S. Rowland
Openended problems for high school and college students to "approach creatively and in their own way": Pascal's simplices ("What is the generalization of Pascal's triangle?"), Pythagorean triples, regular polygons ("What is the area of a regular polygon
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 Is a Circle a Polygon?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about whether a circle is a polygon, whether it has zero, one, or an infinite number of edges, and more.
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 James P. Dildine  James P. Dildine
Interactive math lessons for exploring parabolas, triangle areas, Pythagorean triples, triangle angle sums (powered by a Cabri Java applet), cancer and mathematics (image analysis, and determining the area and perimeter of nonregular figures), systems
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 Jayden's Rescue  Vladimir Tumanov; Scholastic Canada Ltd. (pub)
A novel whose plot revolves around mathematical puzzles roughly for grades 46. The puzzles are in verse, and the solutions are provided following each puzzle. The three child protagonists have to solve these puzzles in order to save an imprisoned queen.
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 John Mason's Projects  John Mason
Projects by the author of Thinking Mathematically and former director of the Centre for Mathematics Education: Structured Variation Grids and other animations and applets; studies in algebraic thinking; mathematical explorations; MEMEs (Meaning Enquiry
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 K12 Math Problems, Puzzles, Tips & Tricks  Math Forum
Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), Math Problem sets, and math number and line puzzles.
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 KAMASUMA  KamaSuma
In this game, place the numbers so that the sums of each shape's vertices are equal. Often there is more than one correct solutionearn more points for each extra solution.
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 KenKen  Nextoy, LLC
KenKen is a sudoku variant invented by Japanese mathematics teacher Tetsuya Miyamoto. This site offers puzzles at various levels of difficulty to get you started, as well as rules, tips, news, related products, KenKen programs for your mobile device,
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 KenKen @ the Math Forum  Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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 Kentucky Appalachian Science Enrichment Program (KASEP)  Dr. Pamella P. Shaw
A 5week residential science and math enrichment program for rising tenth grade students, held on the campus of the University of Kentucky and administered by the Outreach Center. This summer experience has been structured to enhance each participant's
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 KidsPsych  Magination Press
Flash games to help young children develop cognitive thinking and deductive reasoning: Oochina on the Farm, Rotating Faces, Oochina in Space, I Spy, Oochina the Archeologist, Oochina's Doughnut Dilemma, Oochina the Treasure Hunter, Oochy's Cube Adventure,
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 Last One at the Table  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about how to be the last one at a round table if every other person leaves; for example, "If x knights are sitting at a round table, and every other one is removed, who is the last one left sitting at the table?"
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 Latitude and Longitude  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about latitude and longitude, such as determining the distance between two points on Earth; along with explanations of pitch, roll, and yaw.
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 Law and Mathematics  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about law and mathematics, such as "How do lawyers use math?"
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 LCM, GCF  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about least common multiple and greatest common factor, along with stepbystep explanations.
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 Learning Games and Activities for K12  Creative Teaching Associates
Over 200 nonelectronic learning games and activities for ages 4 through adult. Math products include flash cards, activity cards, board games, math chips, cards, books, cassettes for basic math facts drill, and many more. Products are also listed by
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 Learning to Learn: Problem Solving  Greg Gay, Learning Disabilities Resource Community (LDRC), University of Toronto
Find out about your learning style by solving challenging arithmetic, logic, and mathematical story problems. Puzzles include analogy exercises which reveal our abilities to infer, map meaning, classify, and alter knowledge in the face of novel learning;
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 Learning to Multiply  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about learning to multiply, with times tables.
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 Learning Wave Communications  Human Relations Media
Learning Wave is a producer of videos, CDROMs and other supplementary materials for math education including interactive games such as Absurd Math. Under the name HRM Video it has created programs such as middle school math mysteries, applicationsbased
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 Least Common Denominator  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about least common denominators, with three different ways to find them.
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 Length and Width  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about length and width, such as whether the length of a rectangle is always the longest side, and if there is a difference between "width" and "base."
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 Letter/Number Puzzles  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about cryptograms, alphametrics, letter sequences, and other letter/number puzzles, such as SEND + MORE = MONEY.
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 Library Video Company
Library Video Company offers a searchable, browseable catalog of video and CDROM products for mathematics instruction on the K12 level, from addition to variables. This resource for primary and high school math educators looking for curriculum enhancers
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 Logicville
Anagram, chess, cryptarithm, cryptogram, doublet, logic, mathematical, magic word square, and tangram puzzles. Select a puzzle at random; solve the puzzle of the week. Interactive puzzles require Java.
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 Long Division  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about long division, with stepbystep explanations.
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 Lure of the Labyrinth  Learning Games to Go (LG2G)
In this free online adventure game, middleschool prealgebra students rescue their pets, combat mysterious monsters, and embark on whimsical math missions to gain a better understanding of proportions, fractions, and ratios, variables and equations,
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 MAA Bookstore  Mathematical Association of America
A searchable list of books, with descriptions, in the following categories: Algebra; Analysis; Applied Mathematics; Calculus; Career Information; Computing and Computers; Elementary Models; Games, Puzzles, and Popular Exposition; Geometry and Topology;
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 Mag's 3x3 Rubik's Cube Solution  Tom Magliery
A small collection of operations for the 3x3 Rubik's Cube, which assumes that you already know how to get one entire face solved; this means not only having all of one color on one side, but also having those 8 pieces in the proper position with respect
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 Make Math More  Make Math More, LLC.
Activities, lesson plans, extensions, teacher guides, student worksheets, and other materials created and sold by a Cleveland middle school teacher to engage his students by making math relevant to their lives: "Probability of Rock Paper Scissors"; "Creating
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