(Scroll down for links to the courses.)The two best sources for free, highquality online math courses are MIT OpenCourseWare and Khan Academy. You don't get any course credit or grades, but if learning is what you care about, these are exactly what you want. If you don't understand your current professor or teacher, using these online courses is a great way to have the material presented in a different way. Usually, that helps the material really click. MIT OpenCourseWareMIT's OCW is best for courses at the college undergraduate and graduate level (Calculus and later.) It's almost like being an actual student in MIT's lecture hall since you get videos of the professor lecturing at the chalkboard. The syllabus, PDF lecture notes, homework assignments, midterms, and solutions are often all available, too. Khan AcademyKhan Academy is best for math courses leading up to college, from arithmetic to algebra to trig to calculus. The presentation style is more personal with a video of the notes Khan is writing out as he's talkingit's more like a math tutor coming over to your house. The founder of Khan Academy recently gave a phenomenal TED lecture. Incredible data visualizations and a great sampling of the thousands of lectures available through Khan Academy. Khan Academy also offers biology, chemistry, physics, finance, SAT prep, competition math, computer science, and more. Getting StartedBelow are a few direct links to specific free online math courses to get you started. All have full highquality video lectures. 
   

Algebra  Slope, ratios, factoring, quadratic equation, functions, inverses, conic sections, partial fractions.  Algebra playlist  Khan Academy  Arithmetic  Adding, subtracting, multiplying, dividing.  Arithmetic playlist  Khan Academy  Calculus 1 (Differential Calculus)  Limits, derivatives, optimization, and other topics of first semester calculus  Calculus I playlist  Khan Academy  Calculus 2 (Integral Calculus)  Indefinite integration, definite integration, solids of revolution, Taylor series and polynomials, and other topics of second semester calculus  Calculus II playlist  Khan Academy  Calculus 3 (Multivariable Calculus)  Partial derivatives, divergence, gradient, curl, line integrals, Green & Stokes' Theorems, double & triple integrals, and other topics of third semester calculus  Calculus III playlist  Khan Academy  Calculus, Single Variable  The best. With complete video lectures.  Calculus MIT OCW  MIT  Differential Equations  The best. Complete video lectures.  Diff Eq MIT OCW  MIT  Differential Equations  Exact equations, integrating factors, first order homogenous, 2nd order linear homogenous, complex roots of characteristic equation, undetermined coefficients, Laplace Transform, inverse Laplace, Dirac delta function.  Diff Eq playlist  Khan Academy  Engineering Mathematics I  Prof. Strang is extremely gifted.  Eng Math MIT OCW  MIT  Geometry  Twocolumn proof, congruent, similar, transversals and parallel lines, obtuse and acute angles, Pythagorean Theorem. Special topics include the Koch Snowflake fractal and the Golden Ratio.  Geometry playlist  Khan Academy  Linear Algebra  Matrix multiplication, inverting matrices, span, linear independence, reduced row echelon form, nullspace, transformations, image, kernel, basis, determinants, transpose, orthogonal, GramSchmidt, eigenvalues, and additional advanced topics such as alternate coordinate systems  Linear algebra playlist  Khan Academy  Linear Algebra  Prof. Strang is extremely gifted.  Linear Algebra MIT OCW  MIT  Multivariable Calculus  The best. With complete video lectures.  Multivar Calc MIT OCW  MIT  Prealgebra  Fractions, exponents, order of operations, logarithms, scientific notation, significant figures.  Prealgebra playlist  Khan Academy  Precalculus  Limits, sequences, series, Binomial Theorem, compound interest, polar coordinates, parametric equations, function inverses.  Precalc playlist  Khan Academy  Probability  Binomial coefficients, independent events, dependent events, combinations, expected value, probability density functions, binomial distribution, Poisson process.  Probability playlist  Khan Academy  Statistics  Variance, standard deviation, normal distribution, confidence intervals, type 1 error, hypothesis test, squared error, Rsquared, Chisquared test.  Statistics playlist  Khan Academy  Trigonometry  Radians and degrees, sine, cosine, tangent, trig identities, polar coordinates, inverse trig functions.  Trig playlist  Khan Academy 
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