Algebra and geometry have always been staples of high school mathematics, but more students are also taking probability and calculus. Even the best students sometimes need a little help or clarification of difficult math concepts. Fortunately, the Internet provides a lot of resources for homework help. Teachers can also benefit from fresh lesson plan ideas and tools for the classroom. The following sites provide both teachers and students with activities and aids for understanding all kinds of math.

## Algebra

- Math Exercises: A site with exercises that allows students to check their work with the computer
- College Algebra: A college algebra site that covers high school algebra under its pre-requisites section
- Purple Math: Gives explanations, definitions, and examples problems
- Algebra Class: A website that provides lessons on concepts in algebra
- The Math Page: An algebra site with sample questions that can be checked on screen
- AlgeBasics: Algebra video tutorials
- Video Tutors: Videos featuring individual algebra concepts
- The History of Algebra: The history of algebra all over the world
- Fun with Calendars: An algebra game to play
- Algebra Jeopardy: An algebra Jeopardy game online
- Index for Algebra: Definitions for math words
- Alge2Caching: A game for advanced algebra
- Study Guide for Algebraic Expressions: A guide for evaluating problems and solving order

## Calculus

- Karl's Calculus Tutor: A site explaining calculus concepts
- Visual Calculus: A collection of modules in calculus
- Animated Calculus: Graphics for calculus
- Calculus Corner: Resources for understanding calculus
- The Changing Face of Calculus: An article with recommendations students taking calculus in high school
- Are You Ready for Calculus?: A test that reviews pre-calculus concepts
- How to Succeed in AP Calculus: Tips on taking a calculus course
- Special Plane Curves: A visual dictionary of special plane curves

## Geometry

- Interactive Geometry: An interactive site that allows you to manipulate and transform geometric shapes
- Escher's Galleries: Find geometric concepts in Escher’s artwork.
- Origami and Math: Explore geometry through the ancient art of paperfolding.
- Geometry Worksheets: Printable worksheets to practice geometric concepts
- Go Geometry: Geometry help for high school students
- Conjectures in Geometry: An educational website for high school geometry students
- Angling into Architecture: One class of students shows the real world applications of geometry
- Euclid's Elements: An interactive java applet that allows you to manipulate figures
- Fibonacci Webquest: Using the arts to explore the facets of the Fibonacci Sequence
- Tessellations: A definition of tessellations and links to interactive sites and manipulatives
- Virtual Polyhedra: An encyclopedia of polyhedra
- Native American Geometry: Exploring natural shapes
- Euler's Theorem: Geometry interactives that help teach about polyhedra properties
- Pascal's Theorem: A diagram and detailed explanation of Pascal’s Theorem

## Probability

- Interactive Math: A site with interactive lessons and quizzes
- Interactive Probability: Online probability games
- Introduction to Probability: Basic concepts in probability
- Online Stat Book: Real world case studies involving statistics and probability
- Definitions: A glossary of terms related to probability and statistics
- Probability Problems: Probability problems to explore
- Probability Activities: Probability activities that analyze different concepts
- The Probability Web: A collection of probability resources around the Internet
- Virtual Laboratories in Probability and Statistics: Descriptions and explanations of various probability topics

## General Math

- Math TV: Video math lessons
- Math Problem Solver: A program that provides the answer for math questions
- Math Helper: Free homework helpers, tutors, and lessons in Algebra and Geometry
- Unit Conversion Calculator: Online weights and measurements conversion
- Metric System Quiz: Online quiz matching US and Metric systems
- Math Reference Tables: Reference for different math categories
- Online Graphing Calculators: Basic to advanced graphing calculators
- High School Ace: Links to homework help in high school mathematics
- Math Facts and Common Mistakes: Things all students should know about math

## Teaching Resources

- Algebra 2 Lesson Plans: Free lesson plans in PDF form
- Lesson Plans for Math: Plans for various math activities and projects
- Library of Virtual Manipulatives: Online manipulatives for math lessons
- Make Your Own Manipulatives: A site that allows you to download patterns to make your own flashcards and shapes
- Test and Worksheets: Free tests and worksheet generators for teachers
- Algebra Online: Games, quizzes, and other resources for teaching math
- Puzzlemaker: An online puzzle generator
- Geometry Resources: Lots of games and resources
- edHelper: Games, worksheets and other printables for high school algebra and geometry
- National Council of Teachers of Mathematics: A resource with lesson plans and tips for math teachers
- Black Kingdoms of the Nile: Lesson plan on geometry and spatial sense
- The Geometry Junkyard: Links to lesson plans and teaching materials
- Problems with a Point: Resources that help teachers plan lessons that build on previously learned skills