- Industryshack: online unit conversion tools
More then 80 engineering and common unit conversion tools for students, engineers and scientists, as well as links to engineering calculators.
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- The Inflation Calculator - S. Morgan Friedman
A web form that adjusts any given amount of money for inflation, according to the Consumer Price Index, from 1800 to 2005. Pre-1975 data are the Consumer Price Index statistics from Historical Statistics of the United States (USGPO, 1975). All data since
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- InfoMath
Online K-12 math, following the premise that learning mathematics the traditional way is more effective than by playing games. Web-based courses: Math Tutor, Pre-Algebra Tutor, Algebra Tutor, Pre-Calculus.
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- InstaCalc Online Calculator - Kalid Azad
InstaCalc is a fast, shareable and free online calculator. You can compute answers quickly and share a link to any result. Instructions and examples available on the site.
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- Instituto Nacional de Estadística e Informática (INEI) - Perú
El Instituto coordina las actividades estadísticas e informáticas oficiales del Perú. Notas de Prensa; Capacitación (Escuela Nacional de Estadística e Informática y Capacitación a Distancia con cursos para el Censo);
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- Integer Jim's Math Squad - Jim Bennett
Creative ways to use art, writing, research, and Internet projects to make math more exciting for students. The Math Squad art projects are year-long projects; rather than "lesson oriented," they create an "adventure theme" that facilitates math instruction.
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- The IntegerZone - Philip Dorrell
A Java applet which presents the integers as a scrollable rectangular grid of cells, each cell displaying one number. Different modes illustrate different mathematical topics by defining the user's interaction with the grid in terms of response to mouse
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- The Integrator - Wolfram Research, Inc.
A Web interface to Mathematica 3.0. Type in any integral or choose a random sample, and The Integrator sends a Mathematica Link message to a Mathematica kernel, which then does the integral using its built-in Integrate function. The result is sent back
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- Interactivate: Assessments - Shodor Education Foundation, Inc.
A set of Shodor's Interactivate activities that allow the user to keep track of correct responses. To use these activities as "assessments" just select the "Keep Score" button on the Java applet page. A number of these activities, the Connect Four type
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- Interactive and animated Geometric Algebra with Cinderella - Eckhard Hitzer
More than 90 JAVA applets that range from the elementary concepts of vector, bivector, outer product, and rotations, to triangle relationships, oscillations, and polarized waves. A special group of 21 applets illustrates three geometrically different
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- Interactive Course on Projective Geometry - Juan Carlos Alvarez Paiva; Polytechnic University, Brooklyn, NY
An interactive, discovery-based course on projective geometry. Lecture notes, sample exams, applets, and a list of recommended reading are provided.
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- Interactive Games - Cathleen J. Chamberlain and Mark Cogan, Oswego City School District
Design matching games and quizzes. Pre-made 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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- Interactive Geometry with JavaSketchPad - Bryan Dye; MathsNet
Java applets illustrate geometrical figures (circle, cuboid, equilateral, isosceles, and scalene triangles, kite, parallelogram, regular hexagon, octagon, pentagon, quadrilateral, square, rectangle, rhombus, trapezium); show what is meant by congruence,
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- Interactive Introduction to University Maths - Emma Thomas, The University of Surrey, England
An introduction to matrices and determinants; vectors and 3-D planes; and Jordan normal forms. With proofs and examples. Based on the curriculum for first year students pursuing the degree in mathematics from the University of Surrey. Requires Java.
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- Interactive Java Applets - Fergus Murray
Dragoric (The animated fractal toy); Toroidia (Adventures in toroidal geometry); Trochor (Fun with trochoids). See also Fergus Murray's Mathematical Graphics Page, and his mathematical animations.
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- The Interactive Mandelbrot Set
A Java applet that allows you to zoom in on portions of the Mandelbrot set.
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- Interactive Math - Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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- Interactive Mathematics Miscellany and Puzzles - Alexander Bogomolny
"The peculiar beauty of Mathematics lies in deduction, in the dependency of one fact upon another. The less expected a dependency is, the simpler the facts on which the deduction is based - the more beautiful is the result." This award-winning site offers
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- Interactive Mathematics - Murray Bourne, Ngee Ann Polytechnic, Singapore
Flash Tutorials for Pre-Calculus (Algebra, Trigonometry, Logarithms, Complex Number Systems, Graphs); Calculus (Differentiation - The Derivative, its Applications, Deriving Transcendental Functions; Integration, its Applications and Methods), and Advanced
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- Interactive Math Text Projects - Math Forum
Links to interactive texts on the World Wide Web.
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- The Interactive Physics Problem Set - UC Berkeley Instructional Technology Program
This web- site contains almost 100 practice problems for physics students. They're accompanied by detailed solutions and interactive computer experiments. (The computer experiments only run on Macintosh computers that have Interactive Physics II installed,
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- Interactive Precalculus Modeling - Leon La Spina & Students; Bethpage High School, Long Island, NY
An online precalculus curriculum, with problems illustrating a variety of applications, many including detailed solutions and some others with interactive animations. Precalculus modeling refers to the process of finding functions that predict and describe
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- Interactive Real Analysis - Bert G. Wachsmuth
Interactive Real Analysis is an online, interactive textbook for Real Analysis or Advanced Calculus in one real variable. Organized into the topics of sets and relations, infinity and induction, sequences of numbers, topology, continuity and differentiation,
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- Interactive Science Activities on the Web (ISAW) - Richard L. Bowman; Bridgewater College, Bridgewater, VA
Java activities demonstrating fractals and Kepler's laws of planetary orbits. Includes a lab activity using the planetary orbit applet.
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- Interactive Site of Numerical Analysis and Numerical Methods - Roberto Linares
Type in a numerical problem described as variables and equations, and select the
method to solve the specific problem. Problem types include derivation, integration, global and one-dimensional optimization, open methods and bracketing for root finding,
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- Interactive Tests - Ron Knott
Ron Knott has begun producing Mathematics A and AS Level tests for the independent UK curriculum development body, Mathematics in Education and Industry. The web-based format of the tests let you view a problem and then: choose an answer from a multiple
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- Interactive Tools for Investors - The U.S. Securities and Exchange Commission (SEC)
A mutual fund cost calculator, a tax-free vs. taxable yield comparison calculator, a social security retirement planner, a margin calculator, and a ballpark estimate retirement calculator. Also, investor quizzes.
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- Interest Calculations - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java tool for loan and investment calculations with historic background and explanation of the formula.
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- Interest Tutorial - Joseph L. Zachary
A tutorial that explores the concepts of simple, compound, and continuous interest. Includes a Java applet that opens in a separate window, for use alongside the tutorial. From a Computer Science course at the University of Utah, and the book Introduction
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- InterMath Dictionary - The University of Georgia
A searchable dictionary for middle school-level mathematics students, teachers, and parents. The dictionary provides related terms, everyday examples, interactive checkpoints, and challenges. Funded by the National Science Foundation, InterMath is a collaborative
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- InterMath - The University of Georgia
InterMath is a professional development effort designed to support teachers in becoming better mathematics educators. InterMath workshops provide an ongoing support community, a lesson plan database, and a discussion board. The site provides mathematical
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- International Association for Statistical Computing
Membership information, list of conferences, and a 3-D Java applet of the normal distribution.
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- International Unit Conversion Calculator
Comprehensive unit conversion calculator with 20+ categories such as heat and temperature, pressure, volume, area, density, time, speed, velocity, force, angle, power, energy, frequency, computer, electric current, electric capacitance, currency, calendar,
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- Internet Calculus - Larson, Hostetler, Edwards; Houghton Mifflin (HMCO)
Internet Calculus is a comprehensive multimedia course in Calculus. It contains the complete text of Calculus, Sixth Edition by Larson, Hostetler, and Edwards. It also has many other features, such as a syllabus manager for instructors, rotatable three-dimensional
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- Internet Educational Workbook (INEW)
Learning by practicing: a hard copy workbook and an online mathematics worksheet database for use both in the classroom and at home, for students in Kindergarten through grade 6. There is also an online version of the worksheets with audio instructions
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- The Internet Mathematics Challenge - Julie Houston and David Trask
Explore the geometry of architecture, and share your observations with the students who built this site. With a Java-enabled browser, mouse over pictures of buildings to find the angles, arches, and other geometric figures appearing in Durham Cathedral,
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- Introduction à la géométrie absolue avec CabriJava - Yves Martin
Pages on the Bachmann' axiomatic with dynamic (CabriJava) examples in the
hyperbolic or elliptic plane.
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- Introduction à l'algèbre - Gilles G. Jobin, Projet Diderot
An interactive course, with extensive use of the Geometer's Sketchpad. Sommaire: Introduction générale; Conseils techniques; Test diagnostique (En chantier); Définitions et vocabulaire; Représentation sur la droite numérique;
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- Introduction to Probability - Grinstead, Snell; American Mathematical Society
A text for a first course in probability that emphasizes the use of computing to simulate experiments and make computations. Read it on the Web or download it. A set of programs (Mathematica, Maple, TrueBASIC versions can be downloaded) goes with the
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- Introductory Statistics Demonstrations - David Wallace; Ohio University
Animated problems illustrating basic statistics concepts such as Variance and Standard Deviation, Z-Scores, Sampling Distributions, Standard Error, Confidence Intervals, Power, and ANOVA. With a basic review of algebra and interactive problems and solutions
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- invention at play - Lemelson Center, Smithsonian National Museum of American History
Rotate and translate the tangram-like 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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- Investigating LCM and GCF Using Rods - Margo Lynn Mankus
The objective of the lesson plan Investigating LCM and GCF Using Rods is to look at the Least Common Multiple (LCM) and Greatest Common Factor (GCF) from "hands-on" pattern-building to using set theory. With teachers as the intended audience, the activity
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- Investigating Linear Relationships: The Regression Line and Correlation (i-Math Investigations) - Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. Interactive computer-based tools allow students the opportunity to manipulate numbers easily and investigate the relationships between data points and sets. This i-Math Investigation uses an interactive
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- Invest Smart - David Leung, George Lee, and Andy Kim
Learn about the stock market and investment techniques. A Market Simulation lets classes, clubs, or individuals invest an imaginary $100,000 and track the results; includes a separate mutual funds simulation. Site also contains information about saving
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- Invitation to MasterMind - Cut the Knot!, Alexander Bogomolny, with Don Greenwell
Mastermind is a game played by a codemaker and a codebreaker. The codemaker selects a code, a sequence of four colors (digits, pegs or other symbols) chosen from a set of six colors (repetitions allowed). The codebreaker will then try to guess the code.
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- iPracticeMath - Prashant Agrawal
Type in your responses to iPracticeMath's online multiple-choice questions, and press the orange "submit" button to check your answers: addition, subtraction, multiplication, division, algebra, "word to number" (interpreting written-out quantities), and
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- IQFlash.com - Sergey Melnikov
Logic and math games include a variation of Nim, Rhumb Line (similar to tic-tac-toe), and Breakfast Brainstorm (rotate the pans in order to make each of the four numbers equal 20 as soon as possible). Strategy articles include games such as tic-tac-toe,
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- ItAllAddsUp - Council for Economic Education
Online Shockwave games and simulations for teens to learn about -- and practice making decisions with -- managing credit, buying a car, paying for college, budgeting, saving, investing, and more.
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- IXL Learning
IXL provides free online practice, organized by grade levels K-8 and aligned to state standards. Choose one math skill from among the hundreds offered, and submit your answer. Respond incorrectly, and click on the "explanation" button to learn more; get
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- Jaap's Scratch Pad - Jaap Scherphuis
Java applets, generators, and solutions for sudoku, Rubik's Cube, "moving pieces" puzzles, permutation puzzles, and more, including sphere symmetries, polyform, Towers of Hanoi, and many lesser known puzzles from this collector. Scherphuis' articles range
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