Learn Algebra
A free, interactive algebra course where you solve every problem yourself. The board offers only legal moves, checks each line as you write it, and shows you the picture behind every equation.
2,316+ learners enrolled
306 lessons298 challenges195 quiz questions
- Beginner friendly
Hands-on interactive lessons
Audio narration on every lesson
Quizzes to test your knowledge
Free certificate of completion
Syllabus
Section 1
Fundamentals
Start sectionStartEquations from zero: what an equation is, the moves that solve one, negatives, fractions and decimals inside them, and turning words and formulas into equations you can solve.What an Equation Is
4 lessons4One-Step Equations
4 lessons4Negative Numbers
5 lessons45Two-Step Equations
6 lessons6Tidying First
6 lessons6Variables on Both Sides
6 lessons6Fractions in Equations
6 lessons6Decimals and Percent
5 lessons5Special Cases
4 lessons35From Words to Equations
6 lessons6Formulas
5 lessons5Final Challenges
4 lessons415Section 2
Inequalities & Absolute Value
Start sectionStartInequalities from the signs up: solving them like equations, the one rule that flips, compound inequalities, the number line, and absolute value equations and inequalities.What an Inequality Is
4 lessons4Adding and Subtracting
3 lessons3Multiplying and Dividing
6 lessons6Two-Step Inequalities
5 lessons5Variables on Both Sides
5 lessons5Graphing Solutions
4 lessons4Between Two Numbers
6 lessons6One or the Other
4 lessons4Absolute Value Equations
7 lessons7Absolute Value Inequalities
7 lessons7From Words to Inequalities
5 lessons5Final Challenges
5 lessons5Section 3
Graphs & Systems
Start sectionStartThe coordinate plane from the first point up: plotting, slope, every form of a line, inequalities as shaded regions, and systems solved by drawing, substitution and elimination.Points and Rules
3 lessons3The Whole Plane
4 lessons4Slope
6 lessons6Slope-Intercept Form
6 lessons6Point-Slope Form
5 lessons5Standard Form
5 lessons5Parallel & Perpendicular
4 lessons4Function Notation
5 lessons5Shaded Regions
7 lessons65Systems by Graphing
5 lessons45Solving Systems Exactly
7 lessons7Final Challenges
Project4 lessons45Section 4
Exponents & Polynomials
Start sectionStartPowers from the definition up: the exponent laws, zero and negative exponents, and scientific notation, then polynomials named, tidied, added, multiplied, and divided by a monomial.What a Power Is
5 lessons5The Product Rule
3 lessons3The Quotient Rule
5 lessons45Power of a Power
5 lessons45Product and Quotient Powers
5 lessons5Zero and Negative Exponents
6 lessons6Scientific Notation
6 lessons65What a Polynomial Is
4 lessons4Adding and Subtracting
5 lessons5Multiplying Polynomials
7 lessons7Dividing by a Monomial
5 lessons5Final Challenges
6 lessons615Section 5
Factoring & Quadratics
Start sectionStartLearn to factor using common factors, factor pairs, and special products. Then solve quadratic equations by factoring, taking square roots, and using the quadratic formula.What Factoring Is
4 lessons4The Greatest Common Factor
4 lessons4The Sum-Product Machine
5 lessons420Minus Signs in the Machine
5 lessons520Special Shapes
6 lessons525Factor Completely
5 lessons55The Zero Product Rule
5 lessons515Solving by Factoring
6 lessons615The Square Root Method
5 lessons510The Quadratic Formula
6 lessons65How Many Solutions?
4 lessons410Final Challenges
6 lessons6
Learn by Solving
Work every problem yourself on an interactive board. Each step is a move you choose, every line is checked, and graphs are drawn by hand.
Solving is a game of legal moves. You pick the move; every line follows from the one before it.
Build Your Math Streak
Stay consistent and watch your progress grow! Track your daily math habit, protect your streak with freeze days, and earn rewards for showing up every day.
12 days streak
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January 2026
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Double or Nothing
Day 5 of 7
Streak Freeze
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You're Not Alone
Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Math is better with friends!
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.
An equation is a claim: the two sides name the same number. The equals sign asserts sameness, it gives no orders.
A solution is a value of the unknown that makes the claim true. Substitute it and both sides agree.
Solving means changing the form without changing the claim: the same move applied to both sides keeps the balance.
Earn a Certificate
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your math has come.
Certificate of Completion
Math Fundamentals
Add to LinkedInWhy learn math with Coddy
- You solve, you don't watch. Every lesson puts a real problem on the board and hands you the pen; each step is a move you choose, and the mathematics itself decides what is allowed.
- Stuck is a state the course expects. A hint points at the next move, the coach tells you when a step went backwards, and the worked solution replays line by line whenever you want it.
- The whole algebra arc in order: equations from the very first move, negative numbers, fractions and decimals, then inequalities and absolute value, then the coordinate plane, slope, graphing and systems.
- Graphs you draw yourself. Lines, shaded regions and number-line solutions are placed by hand and checked exactly, so slope becomes something your hands know rather than a formula you recite.
Frequently asked questions about learning math
Do I need to know anything before starting?
No. The course begins with what an equation even is and what the equals sign claims. Negative numbers, fractions, decimals and every later idea are introduced the first time they are needed.
How does solving work without a teacher?
The board only ever offers mathematically legal moves, so you cannot break an equation, only take a longer route. Hints point at the best next move, a coach comments on your direction, and every finished derivation is checked step by step.
What math does the course cover?
The algebra core: solving linear equations of every shape, inequalities and compound inequalities, absolute value, the coordinate plane, slope and the forms of a line, graphing, and systems of equations. Further sections, from polynomials to quadratics, are on the way.
Is math hard to learn?
Most of what makes math feel hard is watching someone else do it, then being alone with the homework. Here the practice is the lesson: you make every move yourself, mistakes are caught the moment they happen, and each idea arrives in a lesson short enough to finish.
Is this math course free?
Yes. The lessons, the interactive board and the quizzes are all free, and you can try the first lesson without an account.
Is this a calculator or a course?
A course. Unlike a solver app, nothing here does the problem for you: the board is where you solve, the hints teach the next move rather than the answer, and it is your own derivation that gets graded.
