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Wolfram Alpha is an in-browser computational software that provides solutions to math problems, graphs, and a limited number of step-by-step solutions. It also is a powerful search engine. For fun, input "orange juice + toast" and see what Wolfram Alpha will output.
Patrick JMT is a great website that has A TON of math tutorials. It's mobile-friendly too!
Math TV is a website produced by Patrick McKeague and family with a variety of videos that explain different math concepts from arithmetic to calculus. Most videos are also available in Spanish.
Khan Academy endeavors to produce high-quality and free education to anyone around the world. A variety of tutorials, interactive online activities, and videos are available in most math subjects. Sign up for an account to get a more personalized experience and to track your improvement.
Desmos is an online graphing tool that is very user-friendly. Students can easily produce high-quality graphs of everything from linear equations to trigonometric functions to implicit equations. Demos will also calculate intercepts, minimum and maximum values, and intersections with other graphs.
Paul's Online Math Notes is a resource from Lamar University available for students enrolled in pre-calculus, calculus, and differential equations. Paul has created a substantial set of notes and examples that are wonderful as supplemental study tools. For detailed information of Lamar Universiyt's online program, please check out its portal https://degree.lamar.edu/
Purplemath is a great resource for students enrolled in arithmetic and algebra. Most of the content on the website is free. (But note that if you click on anything related Mathhelp.com, you will be asked to to sign up for their website service with a monthly fee.)
Unit Converter and Calculators offers all type of online calculator and metric conversions.