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OpenStax Math Textbooks
Open textbooks for introductory statistics, calculus, algebra, pre-algebra, and trigonometry. Open textbooks by Rice University. Faculty can download supplementary materials.
Open Textbook Library
Another wide selection of textbooks on mathematics' topics, includes some peer-reviewed content.
"OpenTextBookStore was created by educators frustrated with the time involved in finding adoptable open textbooks, with the hope to make open textbook adoption easier for other faculty...This is just a listing site for publicly available open textbooks, maintained by a teacher. Print copies are made available through third party print-on-demand companies. Many of the courses have course packages available through MyOpenMath.com, which provides free online homework for several open math textbooks."
Provides open access practice exercises, videos, images, and a personalized learning dashboard to help people of all ages learn about subjects that matter to them.
MIT Open Courseware: Mathematics
"MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity."
Math apps help students complete homework or check their answers. Below is GeoGebra, a graphing calculator for functions, geometry, algebra, calculus, statistics, and 3D math. The app works on all devices and desktop computers.
Homework or Practice
WeBWork is an open-source online homework system for math and sciences courses. WeBWork is supported by the MAA and the NSF and comes with a National Problem Library (NPL) of over 20,000 homework problems.
MyOpenMath is designed for mathematics, providing delivery of homework, quizzes, and tests with rich mathematical content. Students can receive immediate feedback on algorithmically generated questions with numerical or algebraic expression answers. And it can do so much more, providing a full course management system, including file posting, discussion forums, and a full gradebook, all designed with mathematics in mind.
Other Content Providers
With an emphasis on two-year colleges, the National Science Foundation's ATE (Advanced Technological Education) program focuses on the education of technicians for the high-technology fields that drive our nation's economy.
Free online resource
for high school and college students, teachers, parents and people who want to refresh their knowledge in math. This is a perfect study site to get help to do your homework, prepare for a test, or just refresh your memory, etc. Calculators, math notes, and math games provided.
The National Science Digital Library
High quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines.
Virtual Math Lab
Created by the West Texas A&M University for use by anyone anywhere. Open tutorials for Algebra, Math for the Sciences, and Math for the GRE.
Webcasts from UC Berkeley
Watch faculty lecture on mathematics topics for courses at the University of California Berkeley.
Part of the family of free online services from Wolfram Research. These include Wolfram|Alpha, the world's first computational knowledge engine; Wolfram Demonstrations Project, an open-code resource that uses dynamic computation to illuminate concepts in mathematics; MathWorld, the number one mathematics website; as well as The Wolfram Functions Site, WolframTones, and more.
YouTube EDU: Mathematics
YouTube curates video collections to give you a list of the top most viewed educational videos on YouTube for a subject.