Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear...

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictiona...

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. Despite being the work of o...

The goal of this free online learning center is to help high school students prepare for comprehensive exams in English, math, global history, U.S. hi...

Math lessons, tutoring, books, calculators and more. Finish your homework in no time with our free problem solvers and graphing tools. Extensive lesso...

Mathwords home page

Finding a private tutor is easy with WyzAnt Tutoring! Select from thousands of tutors who are experts in subject areas like math, the sciences, and fo...

A comprehensive calculation website, which aims to provide higher calculation accuracy, ease of use, and fun, contains a wide variety of content such ...