Khan Academy Static

Interpreting_linear_expressions

Any expression (mathematical or otherwise) has meaning. Help us match the linear expression to the meaning options given. In some cases, more than one meaning may apply.

Combining_like_terms

Learn how to combine like terms (with negative numbers and variables), including more complex problems involving the distributive property.

Introduction_to_variables

Wait, why are we using letters in math? How can an 'x' represent a number? What number is it? This tutorial is great if you're just beginning to delve into the world of variables and expressions.

Substitution_and_evaluating_expressions

Learn how to substitute (or "plug in") values for variables and evaluate algebraic expressions.

Writing_algebraic_expressions_introduction

Learn the basics of writing expressions with variables.

Overview_and_history_of_algebra

Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

Introduction_to_equivalent_algebraic_expressions

Learn to tell whether or not two algebraic expressions are equivalent by combining like terms and using the distributive property.

Evaluating_expressions_word_problems

Learn how to plug in values to evaluate real-world expressions.

Dependent_independent_variables

Sometimes one variable depends on another. For example, the amount of money you make might depend on how many hours you work.

Division_by_zero

Sal uses algebraic reasoning to tackle the problems of dividing by zero.