BrightChamps Logo
Hamburger Menu Icon for BrightChamps Website Navigation
Login
Creative Math Ideas Image
Live Math Learners Count Icon174 Learners

Last updated on May 26th, 2025

Math Whiteboard Illustration

LCM of 11 and 13

Professor Greenline Explaining Math Concepts

The smallest positive integer that divides the numbers with no numbers left behind is the LCM of 11 and 13. Did you know? We apply LCM unknowingly in everyday situations like setting alarms and to synchronize traffic lights and when making music. In this article, let’s now learn to find LCMs of 11 and 13.

LCM of 11 and 13 for US Students
Professor Greenline from BrightChamps

What is LCM of 11 and 13

We can find the LCM using listing multiples method, prime factorization method and the long division method. These methods are explained here, apply a method that fits your understanding well. 
 

Professor Greenline from BrightChamps

LCM of 11 and 13 using listing multiples method

Step 1: List the multiples of each of the numbers; 


11 = 11,22,33,…143 


13 = 13,26,39,…143 


Step 2: Find the smallest number in both the lists 


LCM (11,13)=143 
 

Professor Greenline from BrightChamps

LCM of 11 and 13 using prime factorization method

Step 1:Prime factorize the numbers 


11 = 11×1


13 = 13×1


Step 2:find highest powers


Step 3:Multiply the highest powers of the numbers


LCM(11,13) = 143 

Professor Greenline from BrightChamps

LCM of 11 and 13 using division method

  • Write the numbers in a row 

 

  • Divide them with a common prime factor

 

  • Carry forward numbers that are left undivided 

 

  • Continue dividing until the remainder is ‘1’ 

 

  • Multiply the divisors to find the LCM

 

  • LCM (11,13) = 143 
     
Max Pointing Out Common Math Mistakes

Common mistakes and how to avoid them in LCM of 11 and 13

Listed here are a few mistakes children may make when trying to find the LCM due to confusion or due to unclear understanding. Be mindful, understand, learn and avoid!

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Duplicating or skipping a factor 
 

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

A factor may be missed when we prime factorize a number. Writing the prime factorization of 13 may be written as 13×2 instead of 13×1 accidentally. 

Max from BrightChamps Saying "Hey"

LCM of 11 and 13 Examples

Ray, the Character from BrightChamps Explaining Math Concepts
Max, the Girl Character from BrightChamps

Problem 1

For any two integers a and b, the LCM is related to their product by the equation: LCM(a, b)×GCF(a, b)=a×b Use this formula to verify if the LCM of 11 and 13, when divided by 11, is equal to the product of 13 and the GCF of 11 and 13.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

LCM(11,13)=143,GCF(11,13)=1

 

Verify:


LCM(11,13)/11=143/11=13


Now, check if:


13×GCF(11,13)=13×1=13


Since both sides are equal, the condition is verified.
 

Explanation

This problem emphasizes verifying relationships involving LCM and GCF using fundamental number theory concepts.
 

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 2

If N is the least number divisible by both 11 and 13, and the sum of the digits of N equals 8, what is N?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The least number divisible by both 11 and 13 is their LCM:


LCM(11,13)=143


The sum of the digits of 143 is:


1+4+3=8


Thus, N=143
 

Explanation

Here, the LCM of 11 and 13 is found to be 143, and then the sum of its digits is verified to meet the condition given in the problem.
 

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 3

A light flashes every 11 seconds and another light flashes every 13 seconds. Both lights flash at the same time. After how many seconds will they flash together again?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

 The time after which both lights will flash together again is the LCM of 11 and 13, which is 143 seconds.
 

Explanation

This problem models a situation of repeated events. The lights will flash together at intervals corresponding to the LCM of their individual flashing times.
 

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 4

A number X is divisible by both 11 and 13. The number is less than 500. What is the largest possible value of X?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

To find the largest number less than 500 divisible by both 11 and 13, we compute the LCM of 11 and 13, which is 143.


Now divide 500 by 143:


500143≈3.5


The largest integer is 3, so the largest number divisible by both is:


143×3=429
 

Explanation

Since we are looking for a number divisible by both 11 and 13, we use the LCM. Then, we find the largest multiple of the LCM that is less than 500.

Max from BrightChamps Praising Clear Math Explanations
Ray Thinking Deeply About Math Problems

FAQs on LCM of 11 and 13

1.What is the GCF of 11 and 13 ?

Math FAQ Answers Dropdown Arrow

2.What is the LCM of 3 and 11?

Math FAQ Answers Dropdown Arrow

3.What is the LCM of 11 and 15?

Math FAQ Answers Dropdown Arrow

4.What is the LCM of 9 and 15?

Math FAQ Answers Dropdown Arrow

5.What is the LCM of 8 and 12?

Math FAQ Answers Dropdown Arrow

6.How can children in United States use numbers in everyday life to understand LCM of 11 and 13 ?

Math FAQ Answers Dropdown Arrow

7.What are some fun ways kids in United States can practice LCM of 11 and 13 with numbers?

Math FAQ Answers Dropdown Arrow

8.What role do numbers and LCM of 11 and 13 play in helping children in United States develop problem-solving skills?

Math FAQ Answers Dropdown Arrow

9.How can families in United States create number-rich environments to improve LCM of 11 and 13 skills?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important glossaries for LCM of 11 and 13

  • Multiple: the result after multiplication of a number and an integer. To explain, 75×5 =375; 375 is a multiple of 75. 

 

  • Prime Factor: A number with only two factors, 1 and the number. For example,7, its factors are only 1 and 7 and the number when divided by any other integer will leave a remainder behind. 

 

  • Prime Factorization: breaking a number down into its prime factors. For example, 60 is written as the product of 2×2×3×5. 
     
Professor Greenline from BrightChamps

About BrightChamps in United States

At BrightChamps, we believe numbers are more than just figures—they unlock a world full of possibilities! Our goal is to help children throughout the United States master key math skills, focusing today on the LCM of 11 and 13 with special attention to understanding the LCM—in a way that’s engaging, fun, and easy to grasp. Whether your child is calculating the speed of a roller coaster at Disney World, keeping score during a Little League baseball game, or managing their allowance to save for cool gadgets, knowing numbers builds confidence for everyday life. Our hands-on lessons make learning enjoyable and straightforward. Since kids in the USA have unique learning styles, we customize our methods to match each child’s needs. From the lively streets of New York City to the sunny beaches of California, BrightChamps brings math alive, making it meaningful and exciting all across America. Let’s make the LCM an exciting part of every child’s math adventure!
Math Teacher Background Image
Math Teacher Image

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.

Math Teacher Fun Facts Image
Max, the Girl Character from BrightChamps

Fun Fact

: She loves to read number jokes and games.

INDONESIA - Axa Tower 45th floor, JL prof. Dr Satrio Kav. 18, Kel. Karet Kuningan, Kec. Setiabudi, Kota Adm. Jakarta Selatan, Prov. DKI Jakarta
INDIA - H.No. 8-2-699/1, SyNo. 346, Rd No. 12, Banjara Hills, Hyderabad, Telangana - 500034
SINGAPORE - 60 Paya Lebar Road #05-16, Paya Lebar Square, Singapore (409051)
USA - 251, Little Falls Drive, Wilmington, Delaware 19808
VIETNAM (Office 1) - Hung Vuong Building, 670 Ba Thang Hai, ward 14, district 10, Ho Chi Minh City
VIETNAM (Office 2) - 143 Nguyễn Thị Thập, Khu đô thị Him Lam, Quận 7, Thành phố Hồ Chí Minh 700000, Vietnam
Dubai - BrightChamps, 8W building 5th Floor, DAFZ, Dubai, United Arab Emirates
UK - Ground floor, Redwood House, Brotherswood Court, Almondsbury Business Park, Bristol, BS32 4QW, United Kingdom