Free Online Math Courses
From Pre-Algebra and Logic through Algebra, Geometry, College Algebra, Trigonometry, Precalculus, and Statistics — every course is free, with worked solutions, quizzes, and a 15-minute placement check that suggests topics to review.
Take the free placement checkReadiness checks: Pre-Algebra · Algebra 1 · Geometry · Algebra 2 · Trigonometry · Precalculus
More: Free math placement test · Pre-Algebra vs Algebra 1 · College math placement · Relearn math as an adult
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Pre-Algebra
Number sense, decimals, ratios, expressions, equations, graphing, geometry, statistics, and probability.
Grades 6-9 and returning learners · 47 lessons + 10 assessments · 2621 items, including repeats
Explore Pre-AlgebraLogic
Learn the building blocks of clear reasoning: statements, truth values, logical connectives, truth tables, conditionals, logical equivalence, argument validity, quantifiers, counterexamples, sets, diagrams, and proof-ready explanations. A beginner-friendly bridge from math reasoning to algebra, proofs, computer science, and advanced problem solving.
Middle school, high school, homeschool, adult learners, and future computer science students · 90 lessons + 12 assessments · 1998 items, including repeats
Explore LogicAlgebra I
Equations, functions, linear relationships, systems, polynomials, factoring, and quadratics.
High school and adult refreshers · 40 lessons + 9 assessments + 1 optional review · 2388 items, including repeats
Explore Algebra IGeometry
Angles, triangles, congruence, similarity, measurement, circles, transformations, coordinate geometry, and proof.
High school and placement prep · 41 lessons + 9 assessments · 2333 items, including repeats
Explore GeometryAlgebra II
Functions, polynomial fluency, complex numbers, equations, radicals, exponentials, logarithms, trigonometry, and modeling.
Advanced high school · 45 lessons + 5 assessments · 2277 items, including repeats
Explore Algebra IICollege Algebra
Linear foundations, functions, quadratics, complex numbers, radicals, rational expressions, geometry links, polynomials, transformations, logs, and modeling.
College students and adult learners · 44 lessons + 6 assessments · 2280 items, including repeats
Explore College AlgebraTrigonometry
Right-triangle trig, radians, the unit circle, graphs, identities, inverse trig, equations, laws of sines and cosines, vectors, and periodic modeling.
Algebra II-complete learners, precalculus prep, homeschool students, and adult refreshers · 42 lessons + 9 assessments · 2329 items, including repeats
Explore TrigonometryPrecalculus
Build advanced function skills for Calculus readiness: transformations, inverses, polynomials, rational functions, exponentials, logarithms, sequences, parametric and polar forms, and introductory limits.
High school, college repair, adult learners, homeschool students, and STEM-ready learners · 48 lessons + 10 assessments · 2644 items, including repeats
Explore PrecalculusStatistics and Data Analysis
Data displays, statistical summaries, association, sampling, probability, normal models, inference, p-values, and AP / college-style conclusions.
Algebra I-complete learners, AP prep, and adult refreshers · 42 lessons + 7 assessments · 2102 items, including repeats
Explore Statistics and Data Analysis