Variables · Equations · Functions · Graphs
Solve for x.
Ten plain-English lessons across the breadth of algebra. 150+ practice problems with worked solutions. Interactive quadratic solver, slope calculator, factoring helper, and equation tools. Free, forever, for anyone who wants to actually understand the math.
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Quick Start
Where to begin.
Core Topics
Ten lessons cover the whole field.
History
Case studies.
Thinkers
Famous mathematicians.
Timeline
Key milestones in algebra.
Numbers
Algebra by the numbers.
Deep Dives
Concepts worth understanding.
FAQ
Common questions, plain answers.
Comparison
Function types, side by side.
Reference
Classic word problems and how to solve them.
Reference
Number sets and notation.
Debates
Common algebra confusions, settled.
Formulas
Core algebra formulas.
Step by Step
Lessons that teach.
Ten core algebra topics, each with worked examples and three quick practice questions. About 10 to 15 minutes per lesson. Tap any to start.
Targeted Practice
Drill the concepts.
Quick 10-question quizzes from the full question bank. Each question is explained whether you get it right or wrong.
Interactive Tools
Numbers you can play with.
Plug in real values. Quadratic solver, slope calculator, distance and midpoint, factoring, Pythagorean theorem.