Mathematics is the common language of the universe. It is an essential tool in the fields of science, engineering, business, and even the social sciences. The application of mathematics has laid the foundation of modern society and continues to push the frontiers of human progress. Mathmathematiceans seek out patterns, and prove (or disprove) conjectures through proofs in order to advance the understanding of this science.
The following videos teach the basic principles of math -- arithmetic, algebra, calculus, and geometry. There is a course or lecture designed for any level of expertise in the subject. Feel free to explore these lectures in order to build a foundation upon what you already know.