Enter two integers into the calculator to determine the greatest common divisor between the two numbers, also known as the greatest common factor.

## GCD Formula

The greatest common divisor formula is an interesting one to look at. In short, there is no quick mathematical formula that you can plug numbers into. Instead, an iterative process must be done to calculate the GCD.

This iterative process involves starting at the lowest of the two numbers and working down towards 1 to find the greatest number that each integer can be divided by.

## GCD Definition

The greatest common divisor, also known as GCD for short, is a term used in mathematics to describe the greatest positive integer that can divide two numbers and result in two more integers. In other words, the greatest integer that results in a non-partial number when dividing two numbers by that integer.

The GCD is also known as the greatest common factor, or GCF for short.

## How to calculate the GCD of two integers?

The following is a step-by-step guide on how to calculate the GCD between two integers.

- Let’s take two integers 9 and 6. We will determine the GCD between these numbers.
- As stated above, we must implement an iterative process in order to calculate the GDC.
- The first step is to start at the lower of the two numbers and try to divide each integer by that number. So, 9/6=1.333 and 6/6= 1. In this case, 9/6 is not a positive integer so we must move down towards 1.
- Next, this would have us trying the same process for integers 5 and 4. We find that neither of these numbers results in a positive integer either.

## FAQ

**What is the difference between GCD and LCD?**

The GCD, or Greatest Common Divisor, is the largest positive integer that divides two numbers without leaving a remainder. On the other hand, the LCD, or Lowest Common Denominator, is the smallest positive integer that is divisible by both numbers. While GCD focuses on division, LCD is about finding a common multiple.

**Why is the GCD important in mathematics?**

The GCD is crucial in mathematics for simplifying fractions, solving Diophantine equations, and in algorithms such as the Euclidean algorithm for finding the GCD of two numbers. It helps in reducing fractions to their simplest form and is used in various areas of number theory and algebra.

**Can the GCD of two numbers be one of the numbers?**

Yes, the GCD of two numbers can be one of the numbers if one number is a multiple of the other. For instance, the GCD of 8 and 24 is 8, since 8 is a divisor of 24 and there is no larger number that divides both.

**How does the Euclidean algorithm calculate the GCD?**

The Euclidean algorithm calculates the GCD by repeatedly applying the principle that the GCD of two numbers also divides their difference. It involves dividing the larger number by the smaller one, taking the remainder, and then repeating the process with the smaller number and the remainder until a remainder of 0 is obtained. The last non-zero remainder is the GCD.