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  1. What is a variable? (video) | Khan Academy

    Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

  2. Variables & expressions | Pre-algebra | Math | Khan Academy

    Evaluating expressions with multiple variables: fractions & decimals Get 3 of 4 questions to level up!

  3. Algebraic expressions | Algebra basics | Math | Khan Academy

    The core idea in algebra is using letters to represent relationships between numbers without specifying what those numbers are! Let's explore the basics of communicating in algebraic …

  4. Variables, expressions, & equations (video) | Khan Academy

    Expressions are combinations of variables and numbers, while equations equate two expressions. Variables can take on different values depending on the context, and we can evaluate …

  5. What is a variable? (video) | Week 1 | Khan Academy

    Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

  6. Algebra (all content) - Khan Academy

    Algebra (all content) 20 units · 412 skills Unit 1 Introduction to algebra Unit 2 Solving basic equations & inequalities (one variable, linear) Unit 3 Linear equations, functions, & graphs Unit …

  7. Variables & expressions | 6th grade math | Khan Academy

    A variable is a symbol that represents a value, often one that changes, like how long you've been awake. Learn ways that we can change an expression's value (such as by changing the …

  8. Solving an equation for a variable (video) | Khan Academy

    I have this word problem for math homework and I tried solving it with the equation "65mi/h=130mi/h-3" but for some reason I keep on getting the wrong answer. Any help with …

  9. Dependent & independent variables | Algebra (video) | Khan …

    The number of questions you get right is the independent variable, and that's driving the number of points you score. So the number of points you score is the dependent variable.

  10. Unit 1: Introduction to algebra - Math | Khan Academy

    This topic covers: - Evaluating algebraic expressions - Manipulating algebraic expressions & equivalent expressions - Seeing structure in expressions - Irrational numbers - Division by zero