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Last updated on May 26th, 2025

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LCM of 6 and 15

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LCM is a common multiple, the smallest value between the numbers 6 and 15. Did you know? We apply LCM unknowingly in everyday situations like setting alarms and to synchronize traffic lights and when making music.

LCM of 6 and 15 for Indian Students
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What is the LCM of 6 and 15?

The LCM of 6 and 15 is 30. We can find the LCM using the Listing multiples method, the prime factorization method and the long division method. These are explained below. 
 

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LCM of 6 abd 15 Using Listing the Multiples

Step 1: Write down the multiples of the numbers. Don’t stop too early.


Multiples of 6 = 6,12,18,24,30,36, …


Multiples of 15 = 15,30,45,60,75,…


Step 2: Find the smallest number common between the written multiples of 3 and 8


The smallest common multiple is 30


Thus, LCM(6,15) = 30

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LCM of 6 and 15 Using Prime Factorization

Step 1:factorize the numbers into its prime factors 


6 = 3×2

15 = 3×5


Step 2: find the highest powers of the factors of 6 and 15 


Step 3: Multiply the highest powers 


LCM (6,15) = 30
 

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LCM of 6 and 15 Using Division Method

  • Write the numbers 6,15 in a row 

 

  • Divide them by their common prime factors, if there is one

 

  • Carry forward the numbers that are left undivided by the previously chosen factor

 

  • Continue dividing until the remainder is ‘1’ 

 

  • Multiply the divisors to find the LCM

 

  • LCM(6,15) = 30
     
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Common Mistakes and how to avoid them while finding the LCM of 6 and 15

Listed here are a few mistakes that one can commit when trying to find the LCM of the numbers 3 and 8. Try to avoid them. 
 

Mistake 1

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Listing incorrect multiples 
 

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 If the LCM of given numbers is 30, double-check that the number appears on the list of both 6 and 15

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LCM of 6 and 15 Examples

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Problem 1

The LCM of 6 and a number x is 30. Find x.

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Prime factorization of 6: 2×3


LCM of 6 and x is 30, so x must contain the prime factor of 5 to reach 30 (since 6×5=30).


x=5
 

Explanation

The missing number x is 5.
 

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Problem 2

Use the relationship LCM(a,b)×GCF(a,b)=a×b to verify the LCM of 6 and 15.

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GCF(6,15)= 3


LCM(6,15)=30


Now verify:


LCM(6,15)×GCD(6,15)=30×3=90


6×15=90
 

Explanation

The equation holds true. The LCM is correct. 
 

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Problem 3

Simplify the sum 1/6+1/15​ using the LCM of the denominators.

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Find the LCM of 6 and 15: LCM = 30


Rewrite the fractions:


16=5/30,1/15=2/30


Sum: 5/30+2/30=7/30
 

Explanation

The simplified sum is 7/30
 

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FAQs on LCM of 6 and 15

1.What is the HCF of 6 and 15?

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2.What is the LCM of 6,15 and 12?

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3.Find the prime factors of each number:

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4.What is the highest multiple of 6 and 15?

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5.What are the factors of 15?

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6.How can children in India use numbers in everyday life to understand LCM of 6 and 15?

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7.What are some fun ways kids in India can practice LCM of 6 and 15 with numbers?

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8.What role do numbers and LCM of 6 and 15 play in helping children in India develop problem-solving skills?

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9.How can families in India create number-rich environments to improve LCM of 6 and 15 skills?

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Professor Greenline from BrightChamps

Important glossaries on the LCM of 6 and 15

  • Multiple — product of a number and a natural integer 

 

  • Prime factor — number one gets after prime factorization any given number 

 

  • Prime factorization — the process of breaking the number into its prime factors. 
     
Professor Greenline from BrightChamps

About BrightChamps in India

At BrightChamps, we understand numbers are much more than just digits—they open doors to endless possibilities! We strive to help children all across India master key math skills, focusing today on the LCM of 6 and 15 with a special emphasis on understanding the LCM—in a way that’s lively, enjoyable, and easy to understand. Whether your child is calculating how fast a train passes by, keeping scores during a cricket match, or managing pocket money to buy new gadgets, mastering numbers boosts their confidence for everyday situations. Our interactive lessons make learning simple and fun. Since children in India have varied learning styles, we customize our teaching to fit each child. From the bustling markets of Mumbai to the vibrant streets of Delhi, BrightChamps brings math to life, making it relatable and exciting all across India. Let’s make the LCM an enjoyable part of every child’s math learning!
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Hiralee Lalitkumar Makwana

About the Author

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.

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Fun Fact

: She loves to read number jokes and games.

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