 11tutor  Synergy Education International Pvt. Ltd
This online tutoring service engages students with VoIP communication and an interactive whiteboard. 11tutor also offers "overnite solution" homework help; certification programs for preprimary and primary teachers; school adoption programs; and more.
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 17GoldenFish  Nathaniel Highstein
Blog by a high school math teacher and college art teacher. Posts, which date back to April, 2013, have included "Math, Art Education, and RiskTaking," "Triangle Centers and Student Empowerment," "'First Past The Post' And The Dreaded Disease 'Z,'" "Mountain
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 2 Pi Productions  Jake Scott
Instructional math rap includes the original songs "Triangle Experts," "Special Right Triangles," "Graphing Trig Functions," "Quadratic Formula," and "The Best Pythagorean Rap Ever." Lyrics include "The cosine is sine with a phase shift of pi/If you think
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 3Blue1Brown  Grant Sanderson
Video explanations that elucidate with computer animations, changes in perspective, humor, and — occasionally — rhyming voiceover: Euler's formula, circle division (disjoint regions obtained by joining n points around a circle), and complex
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 3D Drawing and Geometry  Cathi Sanders
A Math Forum Summer 1998 Institute project that uses examples of paintings, architecture, etc. to analyze different types of 3D drawings, and teaches students how to create them. Careers in 3D drawing that use these techniques, from architecture to
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 3DXplorMath  Richard Palais
3DXplorMath creates visualizations of mathematical objects and processes. This tool has builtin algorithms for displaying mathematical objects such as plane curves, space curves, surfaces, conformal maps, polyhedra, ordinary and partial differential
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 9th Grade Math Proficiency Test  NASA Lewis Learning Technologies Project
9th Grade Math Practice Questions to test addition, multiplication, wordproblem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K12 Program.
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 About Proofs  Math Forum, Ask Dr. Math FAQ
What is a proof? How do you write a twocolumn proof?
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 ABsurd MAth: Prealgebra from another dimension  Michael Cain; HRM Video; LearningWave Communications
An interactive problemsolving game series where the ultimate power consists of mathematical skill and knowledge. Many pages have hidden clues and areas; when players need help, they may email the staff for assistance. Teachers and parents may request
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 Achievement Technologies
Educational software for learning math at all levels  primary education; GED; community college; adult basic education; correctional, vocational, and special education; mainstream instruction; or home schooling. K12 lessons are aligned to the NCTM Standards.
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 Activity Resources  Activity Resources Inc.
Created by Mary Laycock for mathematics teachers, with the goal of providing a real understanding of mathematics through handson (manipulative) activities. Purchase books and manipulatives on arithmetic, base ten, red and blue blocks, Cuisenaire rods,
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 Adventitious Geometry  Tony Davie; School of Mathematical and Computational Sciences, Univ. of St Andrews, Scotland
A brief illustrated page about a seemingly simple problem involving an isosceles triangle with some angles given. Under what circumstances are all the angles in the diagram rational multiples of pi? Further discussion of adventitious quadrangles and concurrent
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 Aha!Math  Learning.com
This K5 curriculum package, aligned to state and Common Core standards, supports differentiated instruction with multiple instructional models. Aha!Math provides students with immediate feedback in interactive story settings. Freely sample games and
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 Algebrainiac  Jessica Bogie
Blog by a Chicagoland middle school geometry and history teacher with more than a decade of experience teaching algebra and prealgebra. Posts, which date back to August, 2012, have included "#MSSunFun: Teaching Students How to Study for Assessments,"
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 Algebra in Simplest Terms  Annenberg Media
In this video series for college and high school classrooms and adult learners, host Sol Garfunkel explains how algebra is used for solving realworld problems. Free sign up is required for firsttime users of the online videos. Materials (videos and
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 AlgebraLAB: Making Math and Science Connections  Mainland High School (Daytona Beach, FL), Georgia Southern University
Created by mathematics and science teachers, AlgebraLAB is designed to focus on topics and skills from high school mathematics that students must be able to draw upon in their introductory college science courses. AlgebraLAB focuses on lessons and practice
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 Algebra's Friend  Beth Ferguson
High school math teaching experiences blogged by Ferguson, who for decades has served as a classroom teacher, a district consultant, a school principal, and an online university instructor in curriculum, instruction, and gifted education. Posts, which
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 Alive Maths/Maths à Vivre  Nathalie Sinclair
Handson, interactive "microworlds," in which students investigate patterns and relationships, pose questions, play with the variables, and solve problems: Play with Lulu on a grid; practice triangle reflections; play with fractions and decimal patterns
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 All Elementary Mathematics  The Mathematical Web High School
 Dr. Yury Berengard
An online Web high mathematical school, featuring all of the curriculum of elementary mathematics. Arithmetic, algebra, geometry, trigonometry, functions and graphs, analysis. Theory and solving problems. Versions of examination tests. Online consulting.
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 Alternative Math Club
Interactive practice with problems typically found in Japan: exams for junior high school math, high school math, and college math; and entrance exams for high shool and for university. Also available in Japanese.
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 The Altitudes and the Euler Line  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A proof of the existence of the orthocenter of a triangle embodying several concepts such as Morley's complex interpolation theory, Napoleon's theorem, and Morley's miracle; with examples of the theorems and a geometric explanation of the Euler Line and
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 Al Zimmermann's Programming Contests  Al Zimmermann
An "arena where demented computer programmers compete for glory and for some cool prizes." Computationally intensive problems, often involving heuristics, have included "Point Packing," "Retaining Water" (based on magic squares), "Son of Darts," "Topswops"
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 AMATH  AMATH Systems, Inc.
Software for Building and Reinforcing Foundation Mathematics. AMATH is a simple, selfpaced, self grading, computeraided workbook created to combat the math literacy problem in the U.S. It covers 103 modules of foundation mathematics
including: arithmetic,
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 Amlon Tutors
Private tutoring service based in New York City, covering the NJNYCT area. Math topics covered include: Elementary, Algebra, Geometry, Trigonometry, PreCalculus, Calculus, Sequential I, II, II, Statistics.
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 Analysis & Knowledge  Sanford Aranoff
Download data analysis software, such as Patterns, which analyzes and charts trends in stock market using Andrews concepts. See also this former Rutgers University physics professor and current high school educator's thoughts on teaching and help file
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 Analyzing Numeric and Geometric Patterns of Paper Pool (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. The interactive paper pool game in this iMath investigation provides an opportunity for students to further develop their understanding of ratio, proportion and least common multiple. Students develop
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 Ancient Mathematics  SunSITE's Vatican Exhibit; Library of Congress
Math history: math and astronomy in the ancient world. Greek Mathematics, Ptolemy's Geography, Greek Astronomy. Scholarship supported science in this world where faith and science were not yet seen as two irreconcilable cultures. Euclid (Elements, Optics);
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 ... and Math Tutoring  Stuart Raffeld
This oneonone tutoring service meets tutees throughout California's West San Fernando Valley, and also tutors online, overthephone, and by email. Posts in Stu's blog, which date back to February, 2011, have included "Ten Ways to Improve your SAT
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 Animated Math Glossary  Math Advantage  Harcourt Brace School Publishers
A K8 glossary of common mathematical terms, categorized by grade. Each entry has an example, most of which are animated. An "other" section at the end of the alphabet gives tables of metric and customary measurements, time, formulas, and symbols. You
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 Anisohedral Tilings Page  John Berglund
Tilings and tessellatings with 2anisohedral and other isohedral tilings. With explanations and a bibliography. Berglund's JavaSketchpad applets include circles in a lattice shape; affine polygons, which extends Napoleon's theorem from a triangle to a
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 Annie's Sketchpad Activities  Annie Fetter
Handouts for activities that incorporate JavaSketchpad, including: making a presentation sketch; investigating the properties of quadrilaterals; the Euler segment; morphing a simple figure to a circle; Napoleon's theorem; drawing a box and its net; and
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 APlusStudent Online Learning
Interactive math lessons with graphics, animation, and audio, based on Micromedia Flash technology. Teacherdesigned, standardsbased lessons. Parents can monitor the progress of their children. There is also homework help and an online gallery where
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 Apples4theteacher.com  Judy Miller
Free interactive early math learning games in JavaScript. Activities reinforce measurement, telling time, shapes, counting, tangrams, and counting money; and some have a specific holiday theme. Counting in Spanish, Polish, and Gaelic also offered.
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 Aquí Matemàtiques (Catalán)  Carlos Romero
Web and interactive materials in Catalán designed to facilitate and improve teacher training in mathematics. Goals: to provide curricular incentives for integrating technology into primary and secondary level teaching; facilitate access to curricula;
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 Arbelos Internet Math Society  Bert Liberi and William F. Widulski, Westchester Communtiy College
A mathematics society dedicated to the pursuit of elegance in problemsolving. Every month, solve challenging problems that require "more imagination than memorization." Also, access old problems and solutions; and study a list of heuristics of problemsolving,
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 Archimedes' Book of Lemmas  Alexander Bogomolny
Archemedes' Book of Lemmas included fifteen propositions. They are listed here, each with its own Java illustration and complete proof.
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 Archimedes  Chris Rorres, Drexel University
A collection of information on Archimedes' life and achievements, complete with historical quotes, illustrations, and animations. The site covers Archimedes' inventions and accomplishments: Archimedes' Claw, Burning Mirrors, the Golden Crown, the Archimedes
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 Archimedes' Laboratory  Gianni A. Sarcone and Marie J. Waeber
Archimedes' Laboratory invents, creates, and develops handson thinking games which help teach mathematical applications. They also create and manufacture original educational manipulatives and puzzles to support promotional activities. The resources
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 Area and Perimeter (SMILE)  Monica Starks, John Fiske Elementary
A middle school lesson on measuring and calculating the area and perimeter of squares, rectangles, triangles, etc. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative
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 Area, Arithmetic and Algebra (SMILE)  Larry Freeman, Kenwood Academy
A lesson designed to show teachers how area of rectangles and squares can motivate the learning of multiplication rules for certain binomials; how students can perform arithmetic based on these identities; and several applications of the "distributive
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 Area Under Curves: The Integral  Don Cohen (The Mathman)
Area on the geoboard; Plotting points on a computer or programmable calculator to find the area under curves; Finding the area under curves on graph paper. Sample problems with some answers and a program to plot points  from Chapter 13 of Don Cohen's
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 Arte Matemática  TV Cultura
Introducões, entrevistas, e programas sobre geometria, números, simetria, perspectiva, tempo, espaço, ritmo, beleza, ordem, caos, o número de ouro, Pítagoras, e mais. Com biografías curtas de autores e artistas.
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 Artlandia Kaleidoscope  Artlandia, Inc.
A fully interactive program based on and available free with the purchase of the software program Artlandia (requires Mathematica 3.0 or higher; available for all platforms that run Mathematica). It
is as easy to use as an ordinary kaleidoscope  create
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 Artlandia  Software for Programmable Creative Graphic Design  Artlandia, Inc.
A Mathematicabased application for artistic interpretation of data and creating mathematical and algorithmic art. The software provides a selection of tools for constructing geometrical objects from numerical arrays, distributing geometric shapes over
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 The Art of Renaissance Science: Galileo and Perspective  Joseph W. Dauben, McMurry University
A hypermedia essay devoted to the genius of Galileo and the relation between his role in the Scientific Revolution and the equally remarkable achievements of Renaissance artists reflected, in part, in the discovery and application of mathematical perpective.
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 Arts & Crafts Class: Let's Fold Origami  Japan Window Project, Stanford University and NTT
Directions for folding an origami crane and a yakko (in the Edo Period, a Yakko was known as a male servant or a valet to a highclass samurai. The figure shown is a representation from the waist up. The diamond shape is the head and it is possible to
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 At Right Angles  Azim Premji University
Journal of math pedagogy and educational technology published since 2012. Issues come out in March, July, and November, with sections such as "In the classroom" (ITC) and Problem Corner, as well as topical features, book reviews, pullouts, and more.
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 Authentic Inquiry Maths  Bruce Ferrington
Blog by an Australian teacher who advocates Tedious Repetitive Activities Involving Number (TRAIN) for the Genuine Application of Mathematical Experience (GAME). Posts, which date back to April, 2012, have included "Top 10 Maths Songs," "Maths and Making
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 Automated Geometry Java Applet Generation  Saltire Software
Prototype automatic generation of Java Applets from a constraintbased geometry description. Examples: geometry applets (angles on a chord, similar triangles, angles between parallel lines, two right kites, perpendicular bisectors of a right triangle,
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 The Aztec Calendar: Math, Geometry, and Design  Charles William Johnson
A site that explores the relation between the mathematics of ancient reckoning systems, expressed in historically significant numbers (cited in the historical record), and designs within the geometry of ancient artwork. The complexity of design within
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