There is video.
Then, there is Virtual Nerd.

We take video-supplemented instruction to the next level, helping educators personalize instruction based on student needs.

Get started for free!

School Edition
Home Edition

Did you know?

You can try Virtual Nerd completely free of charge.

Find out more

What's the Least Common Denominator?

Note:

When you're working with fractions, you may need to find the least common denominator (LCD) in order to get the fractions to have a common denominator so that you can add or subtract them. The LCD is the smallest multiple that the denominators have in common. Learn about the LCD in this tutorial!

Keywords:

  • definition
  • least common denominator
  • lcd
  • denominator
  • fractions
  • polynomial
  • rational expression
  • expression
  • algebraic fraction

Background Tutorials

  • Fraction Basics

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

      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.

  • Adding and Subtracting with Unlike Denominators

      • |
      • |
        How Do You Find the Least Common Denominator of Two Rational Expressions?

      How Do You Find the Least Common Denominator of Two Rational Expressions?

      When adding or subtracting rational expressions, you need have common denominators just like any other fraction. If you don't have common denominators, then you'll need to find the least common denominator (LCD) and use it to get those denominators to be the same. Learn how to find the LCD of two rational expressions by watching this tutorial!