# What is the L.C.M of 3 and 6?

Learn how to find the L.C.M of 3 and 6, the smallest number divisible by both numbers. Explore different methods to solve the problem in this informative article.

In mathematics, the L.C.M (Least Common Multiple) is a crucial concept that helps in solving various problems involving fractions, decimals, and algebra. It is the smallest number that is a multiple of two or more given numbers. The L.C.M of two numbers is used in various mathematical applications, including finding the G.C.D, simplifying fractions, and solving algebraic equations. In this article, we will explore the L.C.M of 3 and 6 and the different methods of finding it.

Before we delve into the L.C.M of 3 and 6, let’s first define L.C.M. L.C.M is the smallest number that is a multiple of two or more given numbers. For example, the L.C.M of 4 and 6 is 12, as 12 is the smallest number that is a multiple of both 4 and 6. The L.C.M is an essential concept in mathematics since it is used to solve various problems, including simplifying fractions, solving algebraic equations, and finding the G.C.D.

## Finding LCM using Prime Factorization

One method of finding the L.C.M of two or more numbers is by using the prime factorization method. Prime factorization involves breaking down each number into its prime factors and then multiplying the common and uncommon factors to get the L.C.M.

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Let’s find the L.C.M of 3 and 6 using prime factorization.

Firstly, we factorize 3 and 6.

• 3 can only be divided by 1 and 3, so its prime factorization is 3.
• 6 can be divided by 1, 2, 3, and 6, so its prime factorization is 2 x 3.

Next, we multiply the common and uncommon prime factors. The common factor is 3, and the uncommon factor is 2.

• The common factor is 3.
• The uncommon factor is 2 x 3 = 6.

Finally, we multiply the common and uncommon factors to get the L.C.M.

• L.C.M = 3 x 6 = 18.

Therefore, the L.C.M of 3 and 6 is 18.

## Finding LCM using Division Method

Another method of finding the L.C.M of two or more numbers is by using the division method. The division method involves dividing the numbers by their common factors until we get a quotient with no common factors. We then multiply all the divisors and the quotient to find the L.C.M.

Let’s find the L.C.M of 3 and 6 using the division method.

Firstly, we list down the multiples of 3 and 6 until we find a common multiple.

• Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, …
• Multiples of 6: 6, 12, 18, 24, 30, 36, …

From the list, we can see that 6 is the first common multiple of 3 and 6.

Next, we divide the common multiple by the numbers and continue dividing by the common factors until we get a quotient with no common factors.

• 6 ÷ 3 = 2
• 6 ÷ 6 = 1

The quotient with no common factors is 2.

Finally, we multiply all the divisors and the quotient to get the L.C.M.

• L.C.M = 2 x 3 x 6 = 18.
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Therefore, the L.C.M of 3 and 6 is 18, which we can obtain using both the prime factorization and division methods.

## Comparison of Prime Factorization and Division Method

There are two main methods for finding the L.C.M of two or more numbers, the prime factorization method and the division method. Both methods have their advantages and disadvantages, and it’s important to understand the differences between them to choose the most appropriate method for a particular problem.

The prime factorization method involves finding the prime factors of each number, multiplying the common and uncommon factors, and finding the product of the resulting numbers. One of the advantages of this method is that it is straightforward and easy to understand. Additionally, it can be used to find the L.C.M of more than two numbers. However, the prime factorization method can be time-consuming, especially for large numbers with many factors.

The division method involves dividing the numbers by their common factors until all the numbers are prime factors, and then finding the product of the resulting prime factors. The division method is faster than the prime factorization method, especially for large numbers. Additionally, it can be used to find the L.C.M of more than two numbers. However, the division method can be confusing for some students, especially those who are not comfortable with long division.

## Conclusion

In conclusion, the L.C.M of two numbers is the smallest number that is a multiple of both numbers. The L.C.M is an important concept in mathematics and is used in various applications, including simplifying fractions, solving algebraic equations, and finding the G.C.D. The L.C.M of 3 and 6 can be found using the prime factorization method or the division method. Both methods have their advantages and disadvantages, and it’s important to choose the most appropriate method for a particular problem. By understanding the L.C.M and the different methods of finding it, students can improve their problem-solving skills and their overall understanding of mathematics.

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