Background Tutorials

• Fraction Basics

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    What's a Numerator and What's A Denominator?

    Numerators and denominators are the key ingredients that make fractions, so if you want to work with fractions, you have to know what numerators and denominators are. Lucky for you, this tutorial will teach you some great tricks for remembering what numerators and denominators are all about.

• Introduction to Algebraic Expressions

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    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!

• Real Number Properties

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    What are the Commutative Properties of Addition and Multiplication?

    The commutative property is a fundamental building block of math, but it only works for addition and multiplication. This tutorial defines the commutative property and provides examples of how to use it.

• Adding Real Numbers

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    How Do You Find a Common Denominator and a Least Common Denominator?

    This tutorial gives you some practice finding a common denominator and the least common denominator of three fractions. There's only one least common denominator, but there are many common denominators. This tutorial gives you one. Can you find another?

• Subtracting Real Numbers

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    How Do You Subtract Fractions with Different Denominators?

    Subtracting fractions with unlike denominators doesn't have to be a nightmare. Just find a common denominator and everything calms down! See how to keep your fraction subtraction calm with this tutorial.

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    How Do You Subtract a Positive Number from a Negative Number?

    Subtracting a positive from a negative? Just remember: subtracting a positive is the same as adding a negative. See how it works in this tutorial!

• The Distributive Property

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    What is the Distributive Property?

    The distributive property is a very deep math principle that helps make math work. It's the rule that lets you expand parentheses, and so it's really critical to understand if you want to get good at simplifying expressions. So check out the tutorial and let us know what you think!