Learn Pre-Algebra
A free, interactive pre-algebra course that takes you from the order of operations to your first expressions. You work every problem out yourself, one line at a time, and the board checks each line as you write it.
217 lessons207 challenges640 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
Numbers & Operations
Start sectionStartThe number skills algebra stands on: working on the board, the order of operations, negative numbers and all four operations with them, powers and square roots, and turning everyday stories into signed numbers.Order of Operations
6 lessons6Mental Math
3 lessons3Negative Numbers
5 lessons515Adding Integers
5 lessons520Subtracting Integers
5 lessons520Multiplying and Dividing
6 lessons525Exponents
6 lessons625Square Roots
6 lessons425Putting It All Together
5 lessons520Numbers in Stories
5 lessons5Final Challenges
5 lessons525Section 2
Factors & Fractions
Start sectionStartFactors, multiples and primes, the greatest common factor and least common multiple, then fractions from the ground up: equivalent fractions, all four operations, mixed numbers, and fractions in everyday problems.Factors and Multiples
5 lessons5Prime Factorization
4 lessons4GCF and LCM
6 lessons625What a Fraction Is
5 lessons515Equivalent Fractions
5 lessons415Adding and Subtracting
6 lessons620Multiplying Fractions
5 lessons510Dividing Fractions
5 lessons415Mixed Numbers
5 lessons515Fractions in Stories
5 lessons515Final Challenges
5 lessons525Section 3
Decimals, Percents & Ratios
Start sectionStartDecimals on the number line and in all four operations, converting between fractions and decimals, percents and the everyday problems they solve, then ratios, rates and proportions.Decimals
3 lessons3Adding and Subtracting
4 lessons4Multiplying Decimals
5 lessons520Dividing Decimals
5 lessons520Fractions and Decimals
5 lessons415Percent Basics
5 lessons510Percent Problems
6 lessons620Ratios
5 lessons415Rates
5 lessons510Proportions
5 lessons415Final Challenges
5 lessons525Section 4
Expressions & Data
Start sectionStartThe bridge to algebra: variables and expressions, evaluating them, the distributive property and like terms, patterns and sequences, then data: averages, tables and charts, probability, and perimeter and area formulas.Variables and Expressions
5 lessons5Evaluating Expressions
4 lessons4The Distributive Property
5 lessons420Combining Like Terms
6 lessons625Patterns and Sequences
5 lessons515Data and Averages
6 lessons525Probability
5 lessons520Tables and Charts
5 lessons515Perimeter and Area
5 lessons515Final Challenges
5 lessons525
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.
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January 2026
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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 pre-algebra with Coddy
- You do the arithmetic. The board checks your numbers instead of working them out for you.
- Mistakes are caught where they happen. On most problems a wrong line is refused at once, so one slip never spoils the rest of the work.
- Every number in the form the question asks for. A task can ask for 3/8 as a decimal, 17/5 as a mixed number or 0.45 as a percent, and only that form finishes it.
- From numbers to algebra. Integers and the order of operations, factors and fractions, decimals, percents and ratios, then variables, expressions and data: everything the algebra course builds on.
Frequently asked questions about pre-algebra
What is pre-algebra?
The math between arithmetic and algebra: negative numbers, the order of operations, powers and roots, factors and fractions, decimals, percents and ratios, and your first expressions with a letter in them. Algebra is built on all of it.
Do I need pre-algebra before algebra?
If fractions, negative numbers or the order of operations feel shaky, yes. Algebra uses them in every line, so a gap there shows up as a mistake later. If they already feel easy, you can start with the algebra course.
What does the pre-algebra course cover?
Four sections: numbers and operations (integers, the order of operations, powers and roots), factors and fractions (primes, GCF and LCM, fractions and mixed numbers), decimals, percents and ratios, and expressions and data (variables, distributing, like terms, sequences, averages and probability).
Can I use a calculator in the course?
No. Working the numbers out is the skill this course trains, so the board has no calculator. Each problem is small enough to do by hand, one line at a time.
Is the pre-algebra course free?
Yes. Every lesson, problem and check is free. A Pro plan removes the daily limit and adds unlimited help from the AI tutor, but the course itself is not behind a paywall.
Who is pre-algebra for?
Middle school students meeting these topics for the first time, high school students filling gaps before algebra, and adults refreshing math they have not used in years. The lessons start from the basics and move at your pace.
