# Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.

### Popular Tutorials in Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.

#### What is a Variable?

You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!

#### How Do You Write a Rule for a Table?

Patterns are everywhere in math! In this tutorial, you'll see how to find a pattern in a table and make a rule for it!

#### How Do You Write and Solve an Equation From a Word Problem?

Word problems are just math in disguise! Follow along with this tutorial to get some practice translating a word problem into a mathematical equation. Then, see how to solve that equation and answer the word problem!

#### How Do You Write an Equation From a Word Problem?

One of the challenges of solving a word problem is first turning those words into a math equation you can then use to solve. This tutorial takes you through a word problem and shows you how to translate it into a useable math equation!

#### What Are Numerical and Algebraic Expressions?

An expression is just a mathematical phrase. In this tutorial, you'll learn about two popular types of expressions: numerical and algebraic expressions. A numerical expression contains numbers and operations. An algebraic expression is almost exactly the same except it also contains variables. Check out this tutorial to learn about these two popular kinds of expressions!