Learn pre-algebra—all of the basic arithmetic and geometry skills needed for algebra.

Learn patterns in math with Khan Academy's interactive lessons and practice questions, tailored to enhance your understanding and problem-solving skills.

Up next for you: Parts of algebraic expressions Get 3 of 4 questions to level up!

Up next for you: Solutions of systems of equations Get 3 of 4 questions to level up!

Pre-algebra 15 units · 179 skills Unit 1 Factors and multiples Unit 2 Patterns Unit 3 Ratios and rates

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Learn the basics of algebra—focused on common mathematical relationships, such as linear relationships.

Understanding and finding factors and multiples. After these videos, you'll be ready for fractions.

Aprende preálgebra: todas las habilidades fundamentales de aritmética y de geometría necesarias para el álgebra.

The Algebra 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a function; Exponential …