# What is the LCM of 7 and 9?

Learn how to find the LCM of 7 and 9, two commonly used numbers in mathematical computations. Discover the importance of LCM in this informative article.

## Introduction

The Least Common Multiple (LCM) is an essential mathematical concept used to find the smallest common multiple of two or more numbers. It is a crucial skill in various fields that require mathematical computations, including engineering, science, and finance. In this article, we will focus on finding the LCM of 7 and 9, two of the most commonly used numbers in mathematical computations.

## Understanding 7 and 9

Before we can find the LCM of 7 and 9, it is essential to understand the factors of each number. The factors of 7 are 1 and 7. On the other hand, the factors of 9 are 1, 3, and 9. We can also identify the common factors of 7 and 9, which are only 1.

To determine the LCM of 7 and 9, we need to identify the smallest common multiple of both numbers. It is also important to note that the LCM of any two numbers is always greater than or equal to the highest number among them.

## Calculation of LCM

To calculate the LCM of 7 and 9, we need to list their multiples until we find the smallest common multiple. The multiples of 7 are 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140, 147, 154, 161, 168, 175, and so on. Similarly, the multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180, and so on.

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By comparing the two lists, we can identify that the smallest common multiple of both numbers is 63. Therefore, the LCM of 7 and 9 is 63.

## Finding LCM using Prime Factorization

Another method to calculate the LCM of 7 and 9 is by using prime factorization. Prime factorization is the process of finding the prime factors of a number, which are the numbers that can only be divided by 1 and themselves.

The prime factors of 7 are 7 and 1, while the prime factors of 9 are 3, 3, and 1. To find the LCM using prime factorization, we need to identify the common prime factors of both numbers, which are 1 and 3. We also need to multiply the uncommon prime factors, which are 7 and 3.

The product of the common and uncommon prime factors gives us the LCM of 7 and 9. Therefore, LCM(7,9) = 1 x 3 x 7 = 21 x 3 = 63. As shown, we get the same result using this method as we did using the listing multiples method, which confirms that the LCM of 7 and 9 is 63.

## Importance of LCM

The LCM is essential in various real-life situations and different fields. For instance, in the field of engineering, the LCM is used to determine the frequency of oscillations in electronic circuits. In science, the LCM is applied in finding the time taken for two celestial bodies to be in the same position relative to the sun. In finance, the LCM is crucial in calculating the interest earned on investments with different compounding periods.

## Examples of LCM in Different Fields

One of the most common examples of the application of LCM is in music. Musicians use the LCM to help them understand the rhythm and time signature of a piece of music. By identifying the LCM of the beats per measure and the duration of each beat, musicians can create a consistent rhythm throughout the song.

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Another example is in the field of computer science. The LCM is used in scheduling algorithms to determine the optimal time for executing multiple processes. By finding the LCM of the time required for each process, the scheduling algorithm can ensure that no process is left waiting for a long time.

## Conclusion

In conclusion, finding the LCM is an essential skill in various fields that require mathematical computations. It is crucial to understand the factors and common factors of the numbers involved and identify the smallest common multiple. The LCM has numerous real-life applications, including music, engineering, science, and finance. By mastering the concept of LCM, we can solve complex mathematical problems and make informed decisions in various fields. To find the LCM of 7 and 9, we can list the multiples of both numbers and identify the smallest multiple that they have in common.

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