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LCM calculator

Enter the numbers separated by comma, and select the method to find the lowest common multiple using LCM calculator.

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How to use the LCM calculator?

To use this LCM calculator, follow the instructions ahead.

  • Enter the numbers separated by commas e.g 3, 8, 9.

  • Select any one of the three methods of your choice. 
  • Click the “Calculate” button. 
  • Reset to use again.

This Least Common multiple calculator is one of the best math tools one can find online. The user simply has to enter the values. It can find LCM by all of the three basic and commonly used methods.

Each of the methods is presented step-wise in the results for the user’s understanding. You can also see the GCF of the entered values under the LCM. 

What is LCM?

LCM stands for least common multiple. It is that one smallest value that can divide the two or more numbers. 

In other words, it is the first common number that comes in the multiple tables of the numbers under study. 

How to find the LCM?

LCM can be found by three main methods. These methods are;

  • Prime factorization
  • Division table
  • List of multiples

The easy and better option to find LCM is by using the LCM finder on top. But for manual calculation, follow the example below.

Example:

What is lcm of 34, 20, and 10?

Prime factorization

Step 1: Write all of the Prime factors of the numbers.

34 = 2 x 17 

20 = 2 x 2 x 5 = 22 x 5

10 = 2 x 5

Step 2: Multiply the prime factors. (If there are common factors like in this case 2 and 5, use them only once.)

= 17 x 5 x 22 = 340

Hence the least common multiple of 34, 20, and 10 is 340. Now, let’s also find the LCM using the other two methods.

Division table

In this method, the numbers are written on a horizontal line. Then they are divided by the common (if any) and smallest prime number. And it goes on until no more division is possible.

Step 1: Write the numbers on the table.

Step 2: Divide the numbers as guided before. Write the quotients directly below the number.

Step 3: Multiply all of the divisors.

= 2 x 2 x 5 x 17 = 340

List of the multiples

The last way to find the lcm of two or more numbers is by listing down all of their multiples until they have at least one common factor. 

Step 1: Write the multiples. 

Multiples of 34: 34, 68, 102, 136, 170, 204, 238, 272, 306, 340, 374, 408.

Multiples of 20: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380.

Multiples of 10: 10, 20 ,30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360.

Step 2: Look for the first common factor.

The first common factor of 34, 20, and 10 is 340. The LCM of these numbers is 340.

LCM Table

LCM of 6 and 8

24

LCM of 6 and 9

18

LCM of 6 and 12

12

LCM of 8 and 12

24

LCM of 9 and 12

36

LCM of 8 and 10

40

LCM of 4 and 6

12

LCM of 6 and 10

30

LCM of 4 and 10

20

LCM of 3 and 8

24

LCM of 3 and 5

15

LCM of 20 and 40

40

LCM of 12 and 15

60

LCM of 18 and 30

90

LCM of 5 and 8

40

lcm of 4, 9 and 12

36

lcm of 3, 5 and 6

30

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