Math

American Mathematical Society

Association for Women in Mathematics

Calc Chat – Offers free student solutions manuals for many math textbooks by Ron Larson.

Math | Khan Academy – Free videos and practice problems for countless topics.

Math Videos | Massachusetts Institute of Technology 

MIT Open Courseware – Full, recorded lectures for learning at your own pace.

PatrickJMT – Free videos for topics such as Algebra, Precalculus, Calculus, Differential Equations, and Discrete Mathematics.

Paul’s Online Math Notes – Free math notes from a Professor. Includes Algebra, Calculus I, II, III, Linear Algebra, and Differential Equations.

WolframAlpha – Solves many numerical problems for Math (including integrals, limits, and infinite series), Physics, Chemistry, Engineering, etc.

Formula sheets:

Algebra and Geometry Formula Sheet (PDF)

Derivatives, Integrals, Trigonometry Formula Sheet (PDF)

Online calculators:

WolframAlpha

EEWeb

Web 2.0 Calc

Desmos.com (Includes graphing mode)

Symbolab

Tydlig calculator – App for iPhone and iPad