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Last updated on May 26th, 2025

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LCM Of 5,7 and 10

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LCM or Least Common Multiple is the lowest number that is divisible by both the given numbers. We use LCM in many parts of our daily life like ordering goods in bulk and predicting when an event might occur. Let us look at what LCM is and and what is the LCM of 5,7 and 10.

LCM Of 5,7 and 10 for Qatari Students
Professor Greenline from BrightChamps

What Is The LCM Of 5,7 and 10?

The LCM of 5,7 and 10 is 70. But how did we get to this answer? This is what we will be learning. Let us also look at the different ways by which we can find the LCM of 2 or more numbers.

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How To Find The LCM Of 5,7 And 10?

As we have read before, there are different ways to find the LCM of 2 or more numbers. Here, is a list of those methods which make it easy to find the LCMs:

 

  • Listing Of Multiples

 

  • Prime Factorization

 

  • Division Method


Let us look deeper into these three methods and how it helps us.
 

Professor Greenline from BrightChamps

LCM Of 5,7 And 10 Using Listing Of Multiples method

In this simple method, we will list all the multiples of 5,7 and 10. Then we will try to find a multiple that is present in all 3 numbers.


For example, 

 


Multiple of 5:  5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100

 


Multiple of 7:  7,114,21,28,35,42,49,56,63,70,77,84,91,98,105.

 

Multiple of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

 

As highlighted, 70 is the lowest multiple that is common in 5,7 and 10. So, 70 is the LCM of 5,7 and 10.
 

Professor Greenline from BrightChamps

LCM Of 5,7 and 10 Using Prime Factorization

Let us break down the given numbers into smaller numbers using only prime numbers. So, 5 will be written as 5, 7 will be written as 7 and 10 will be written as (5x2). We can see that 5 appears twice in the list of numbers. So, we will consider this only once. Now, the list is like 2,5 and 7. 


Now, we have to multiply these numbers to get the least common multiple. 


2x5x7=70. 


We get the answer of 70. This is the least common multiple or the LCM of 5,7 and 10.
 

Professor Greenline from BrightChamps

LCM Of 5,7 And 10 Using Division Method

To calculate the LCM using this method is very simple. We will divide the given numbers by their prime factors. The product of these divisors will give us the LCM of the given numbers.


Let us understand it step by step:


Step 1: First, find the lowest prime factor that can divide at least one of the numbers. In this case, the lowest prime factor is 2. And it divides 10, which will give us a quotient of 5.


Step 2: Now, the numbers that remain are two 5s and one 7. Since these two numbers are prime numbers, it can’t be divisible by any other number. So, now the lowest number is 5. Divide the possible numbers by 5. This will leave only a 7 in the table.


Step 3: Now, divide the 7 by 7. This will only 1s in the last row of the table. Now, on the left side we can see the numbers 2,5 and 7. 


Step 4: Multiply these numbers, and we will get the answer as 70 (7×5×2=70). The answer, 70 is the LCM of 5,7 and 10.

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Common Mistakes That Are Made And How To Avoid Them in LCM Of 5,7 and 10.

Let us look at some of the common mistakes that can happen while solving a given assignment regarding LCM.
 

Mistake 1

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Missing a prime factor
 

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Children sometimes may forget to write all the prime factors for a given number. So, at the start we have to write all the prime factors for the given numbers which won’t cause any problems later on.
 

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LCM of 5,7 and 10, Examples

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Problem 1

What is the LCM of 5,7 and 10?

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The LCM of the given numbers is 70.
 

Explanation

factors of 5= 5

factors of 7=7

factors of 10= 2x5

LCM= 2x5x7 =70The LCM of the given numbers are 3150.

 

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Max, the Girl Character from BrightChamps

Problem 2

What is the LCM of 7,9 and 50?

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The LCM of the given numbers are 3150.
 

Explanation

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Max, the Girl Character from BrightChamps

Problem 3

What is the LCM of 5,10 and 15?

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The LCM of the given numbers are 30.
 

Explanation

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Max, the Girl Character from BrightChamps

Problem 4

What is the LCM of 5,10 and 15?

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The LCM of the given numbers are 30.
 

Explanation

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Max, the Girl Character from BrightChamps

Problem 5

Three clocks ring after every 15 minutes, 30 minutes and 50 minutes. If they rang together once now, when will it ring together again?

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If we get the LCM of the numbers 15,30 and 50 we will get the final minutes. And the LCM is 150. So, they will ring together after another 150 minutes.
 

Explanation

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Max, the Girl Character from BrightChamps

Problem 6

There are 3 workers A, B and C. Worker A works for 5 days a month, Worker B works for 7 days a month and Worker C works for 10 days a month. If they work together today, when is the next time all three of them will work together?

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

The LCM of 5,7 and 10 is 70. So, they will work together again after 70 days.
 

Explanation

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FAQs On LCM Of 5,7 And 10

1.What is the LCM of two prime numbers?

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2.What is the GCF of any two prime numbers?

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3.What is the best way to find LCM of larger numbers?

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4.Can we use LCM in real life situations?

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5.How can children in Qatar use numbers in everyday life to understand LCM Of 5,7 and 10?

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6.What are some fun ways kids in Qatar can practice LCM Of 5,7 and 10 with numbers?

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7.What role do numbers and LCM Of 5,7 and 10 play in helping children in Qatar develop problem-solving skills?

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8.How can families in Qatar create number-rich environments to improve LCM Of 5,7 and 10 skills?

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Professor Greenline from BrightChamps

Important glossaries for LCM of 5,7 and 10

  • Prime Numbers- Any number that has only 2 factors is called a prime number.For example, 2 and 3. Both these numbers have only 2 factors,1 and the number itself.

 

  • Prime Factorization- Breaking off big numbers into smaller numbers using prime numbers.For example, 10 can be broken down as 5×2, where 5 and 2 are prime numbers.

 

  • Divisible-  It means for a number to divide another number and leave no remainder.For example, 10/5 where the quotient will be 2 and the remainder will be 0.
Professor Greenline from BrightChamps

About BrightChamps in Qatar

At BrightChamps, numbers represent more than digits—they unlock countless opportunities! Our goal is to help children throughout Qatar master important math skills, focusing on the LCM Of 5,7 and 10 with special attention on understanding the LCM—in a lively, fun, and easy way. Whether your child is calculating how fast a roller coaster moves at Qatar’s Angry Birds World, keeping score at local football matches, or managing their allowance to buy gadgets, mastering numbers builds confidence for daily challenges. Our interactive lessons make learning enjoyable and simple. Because children in Qatar learn in many different ways, we adapt our approach to suit each learner. From Doha’s modern cityscape to desert landscapes, BrightChamps makes math come alive. Let’s make the LCM a fun part of every child’s 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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