Mathematics

A subreddit for homework help. It will not give you answers but get hints and assistance from helpful members of the site.

A subreddit dedicated to math. Not for homework help.

Millions of titles digitized from libraries around the world.

Instructional mathematics videos on advanced topics from Algebra & Geometry to Differential Equations and Multivariable Calculus.

A list of MIT open courses that are available. Includes lectures, tutorials, assignments, and tests.

A collection of TED Talks (and more) on the topic of math.

A collection of educational math videos posted on YouTube.

Free math textbook that covers the traditional topics studied in a modern prealgebra course, as well as topics of estimation, elementary analytic geometry, and introductory algebra

This is a textbook for Basic Mathematics for community college students

This textbook, Elementary Algebra, is the first part, written in a clear and concise manner, making no assumption of prior algebra experience. It carefully guides students from the basics to the more advanced techniques required to be successful in the next course.

Coursera contains classes taught by top instructors. It includes lectures, the textbook, and assignments that are graded on the spot.