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Learn Math

A free, interactive math 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.

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1,000+ codders enrolled

128 lessons125 challenges580 quiz questions

  • Beginner friendly
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

2 sections128 lessons125 challenges580 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Equations 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.64 lessons61 challenges260 questions

    What an Equation Is

    5 lessons515

    One-Step Equations

    6 lessons525

    Negative Numbers

    5 lessons420

    Two-Step Equations

    6 lessons625

    Tidying First

    6 lessons625

    Variables on Both Sides

    6 lessons625

    Fractions in Equations

    6 lessons625

    Decimals and Percent

    5 lessons520

    Special Cases

    4 lessons315

    From Words to Equations

    6 lessons625

    Formulas

    5 lessons520

    Final Challenges

    4 lessons420
  2. Section 2

    Inequalities & Absolute Value

    Start sectionStartExpandCollapse    Inequalities from the signs up: solving them like equations, the one rule that flips, compound inequalities, the number line, and absolute value equations and inequalities.64 lessons64 challenges320 questions

    What an Inequality Is

    5 lessons525

    Adding and Subtracting

    5 lessons525

    Multiplying and Dividing

    6 lessons630

    Two-Step Inequalities

    5 lessons525

    Variables on Both Sides

    5 lessons525

    Graphing Solutions

    4 lessons420

    Between Two Numbers

    6 lessons630

    One or the Other

    4 lessons420

    Absolute Value Equations

    7 lessons735

    Absolute Value Inequalities

    7 lessons735

    From Words to Inequalities

    5 lessons525

    Final Challenges

    5 lessons525
What you get
Everything you'll use to learn math

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.

Math board
Step by step
2x + 3 = 7Subtract 3 from both sides2x = 4Divide both sides by 2x = 2

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

Return tomorrow to keep your streak!

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January 2026

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Double or Nothing

Day 5 of 7

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Streak Freeze

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You're Not Alone in This

Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Math is better with friends!

Challenger League
Challenger LeagueTop 7 advance
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Every 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.

What an Equation Is
Audio

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.

1xSarah

Prove Your Skills

Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your math has come.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
math iconMath Fundamentals
Verified
DateJan 2026
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Why 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.
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