Lowest Common Denominator (LCD) of 87/56 and 12/13

So you wanna find the lowest common denominator of 87/56 and 12/13? Lucky for you that's exactly what this page is here to help you with! In this quick guide, we'll walk you through how to calculate the lowest common denominator for any fractions you need to check. Here we go!

In a rush and just want the answer? No worries! The LCD of 87/56 and 12/13 is 728. In fraction form it's 3/728.

LCD(87/56, 12/13) = 728

In fraction form:

3 / 728

Read on to find out how we worked that out!

As we always do in these articles, it's worth a very quick recap on fraction terminology. The number above the line is called the numerator and the number about the line is called the denominator. So, in this example, our numerators are 87 and 12, while our denominators are 56 and 13.

What is the Lowest Common Denominator?

To calculate the lowest common denominator, the easiest way is to look at the factors of those numbers and find the lowest common multiple. Here's how that looks for 56 and 13:

  • Factors for 56: 1, 2, 4, 7, 8, 14, 28, and 56
  • Factors for 13: 1 and 13

Since there are no common factors in 56 and 13, the easiest way to get the lowest common denominator is to multiply them:

56 x 13 = 728

The next step is to calculate the numerator and complete our fraction. To do this, we need to find the greatest common factor of the numerators, which are 87 and 12.

  • Factors for 87: 1, 3, 29, and 87
  • Factors for 12: 1, 2, 3, 4, 6, and 12

As we can see, the greatest common factor between the numerators is 3, so this becomes our numerator in the fraction:

3 / 728

Hopefully this article has helped you to understand how to calculate the lowest common denominator of two fractions. Isn't math fun? If you want to challenge yourself, try to work out the least common denominator of some fractions by yourself and use our LCD calculator to check your answers!