Free Online Math Courses
From Pre-Algebra through College Algebra and Geometry — every course is free, with worked solutions, quizzes, and a 15-minute placement check that pinpoints your gaps.
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Pre-Algebra
Number sense, decimals, ratios, expressions, equations, graphing, geometry, statistics, and probability.
Grades 6-9 and returning learners · 52 lessons · 1651 problems
Explore Pre-AlgebraAlgebra I
Equations, functions, linear relationships, systems, polynomials, factoring, and quadratics.
High school and adult refreshers · 46 lessons · 1460 problems
Explore Algebra IAlgebra II
Functions, polynomial fluency, complex numbers, equations, radicals, exponentials, logarithms, trigonometry, and modeling.
Advanced high school · 49 lessons · 532 problems
Explore Algebra IIGeometry
Angles, triangles, congruence, similarity, measurement, circles, transformations, coordinate geometry, and proof.
High school and placement prep · 45 lessons · 602 problems
Explore GeometryCollege Algebra
Linear foundations, functions, quadratics, complex numbers, radicals, rational expressions, geometry links, polynomials, transformations, logs, and modeling.
College students and adult learners · 49 lessons · 604 problems
Explore College Algebra