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A+ Math
Math games, flash cards, and homework help for elementary students.

Cool Math
A fun math site with online math games and lessons.

Webmath.com
This site has over 100 instant-answer, self-help, math-solvers as well as help from a "human math expert."   

Math League Help Topics
Math help resource for 4th through 8th grades.

Ask Doctor Math
A question and answer service for K-12 math students.

Math Glossary of Terms
Don't know the meaning of a specific math word? Look it up here.

Algebra Homework Help
Purple Math - Your Algebra Resource
Algebra modules, guidelines for homework, and a study skills survey.

S.O.S. Mathematics - Algebra
An excellent, well-indexed help source.

S.O.S. Math - Matrix Algebra
From the above site.

Algebrahelp
Another well-indexed help site.

Algebra Internet Sites
Links.

Geometry Homework Help
Math.com Homework Help Geometry
An extensive resource.

Webmath: Plots and Geometry
Equation line, plotting conic sections, graphing and plotting, geometrical objects.

Math Forum - K-12 Geometry
K-12 Internet geometry resources.

Geometry Junk Yard
Another list of links to geometry resources.

The Spanky Fractal Data Base
Links to many fractal sites.

Trigonometry Homework Help
S.O.S. Math - Trigonometry
An excellent, well-indexed help source.

Webmath - Trigonometry and Calculus

Calculus Homework Help
S.O.S. Math - Calculus
An excellent help page.

Math Forum: Calculus
Links to Internet calculus resources. See also Math Forum: Pre-Calculus.  

AP  Calculus Home Page
Resources, software, lessons.

Differential Equations Help
S.O.S. Math - Differential Equations
Too bad this page didn't exist when I took this course as an undergraduate!

Math Forum: Differential Equations
Classroom materials for teachers and students, software, and Internet projects. See also Math Library: Differential Equations.

Statistics Help
Introductory Statistics Tutorial
An excellent source for help with basic statistical concepts.

Psychological Statistics
An index of topics and information for a college-level psychological statistics course.

Probability and Statistics Internet Projects
A good site for project ideas.

Probability and Statistics in the Classroom
Lesson plans, problems, puzzles, and resources for probability and statistics.

Cast Your Vote
An on-line statistics simulation.

Common Concepts in Statistics
A huge glossary of statistical terms.

Educational/Psychological Measurement Help
A Glossary of Measurement Terms
From ERIC. See also Glossary of Useful Terms.

Measurement Primer
Basic concepts used in educational and psychological measurement including basic statistics, norms, validity, and reliability.

Measurement and Testing
Definitions of basic measurement terms and concepts.

Overview: Validity and Reliability
A site providing definitions and information about these two important concepts of psychological and educational assessment/measurement. See also Reliability and Validity: What's the Difference?

Physical Measurement Help
Measure 4 Measure
A collection of interactive sites that estimate, calculate, translate, etc.

World of Measurement
Award-winning site with elementary measurement info and activities.

Dictionary of Measures, Units and Conversions
Information and conversion factors for most of the units of measurement in use around the world.

Metric and Imperial Conversion Tables

Math History Homework Help
History of Mathematics Archive
Biographies of over 1000 mathematicians.

History of Mathematics (Math Archives)
Many links to sites related to math history.

Biographies of Women Mathematicians

Chronological List of Mathematicians