Web sites that list resources in mathematics and that link to mathmistakes.info:

• The Maths Internet Guide "Over 400 free quality websites carefully chosen for their interactivity and grouped into five search categories. Ideal for individual learning, homework, demonstrations or explorations." (enter the site and click on the category "Topics Only" for link to mathmistakes.info).
• Internet4Classrooms "Helping Teachers Use the Internet Effectively" (click "Links for K-12 Teachers" > "Math Topics" (and then also "General Math" and "Secondary") for links to mathmistakes.info).
• Karl's Calculus Tutor "A place for a 1st year calculus student to come when he or she needs a helping hand" (click "Cool Math Links" for link to mathmistakes.info).
• Cool Math Sites page of Mrs. Heal's Homepage (the web pages of a teacher in the Kent County (Maryland) Public School system).
• Homeschool Math, a comprehensive math resource designed for homeschooling parents and teachers (Click on "Math help" in the "Online Math Resources" section on the right side of the page for link to mathmistakes.info).

(If your site links to mathmistakes.info, please send email to comments[at]mathmistakes[dot]info with the URL of the linking page to get added to the list above.)

Web sites that provide information on calculus:

• Calculus at mathworld, an online encyclopedia of mathematics
• Derivative at mathworld, an online encyclopedia of mathematics
• Derivative Rules at mathwords
• Indefinite Integral at mathworld, an online encyclopedia of mathematics
• Integral Table at mathwords
• Rules for Integration A page from the mathematics reference pages by Erik Max Francis
• calculus.org Resources for the calculus student, sponsored by the Departments of Mathematics at the University of California - Davis and Williams College, and by the Morgan Foundation
• Calculus on the Web A project of Gerardo Mendoza and Dan Reich, Temple University
• Calculus-Help.com A calculus resource by Michael Kelley, the author of "The Complete Idiots Guide to Calculus"
• Calculus Solutions A collection of solutions to typical calculus problems
• The Calculus Hater's Home Page Despite the name of the site, a collection of resources for surviving calculus

Web sites that provide general information on algebra, trigonometry, calculus and other areas of mathematics:

• mathworld An online encyclopedia of mathematics
• Mathwords Terms and Formulas from Algebra I to Calculus
• Purplemath An extensive algebra resource
• Paul's Online Math Notes Online notes and tutorials by Paul Dawkins, Lamar University

Web sites that specifically discuss algebra mistakes/errors:

• The Most Common Errors in Undergraduate Mathematics A web page written by Eric Schechter, a professor at Vanderbilt University
• Algebra Review Harvey Mudd College Online Mathematics tutorial
• Top Algebra Errors A web page written by Thomas L. Schofield, a professor at Calvin College

If you want more help than you can find on mathmistakes.info or on other web sites, one source of more information is in good old fashioned books.