Lowest Common Denominator (LCD) of 87/56 and 22/81

So you wanna find the lowest common denominator of 87/56 and 22/81? 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 22/81 is 4536. In fraction form it's 1/4536.

LCD(87/56, 22/81) = 4536

In fraction form:

1 / 4536

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 22, while our denominators are 56 and 81.

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 81:

  • Factors for 56: 1, 2, 4, 7, 8, 14, 28, and 56
  • Factors for 81: 1, 3, 9, 27, and 81

Since there are no common factors in 56 and 81, the easiest way to get the lowest common denominator is to multiply them:

56 x 81 = 4536

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 22.

  • Factors for 87: 1, 3, 29, and 87
  • Factors for 22: 1, 2, 11, and 22

As we can see, the greatest common factor between the numerators is 1, so this becomes our numerator in the fraction:

1 / 4536

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!