Find Least Common Multiple of 84 and 261 using ladder method..

LCM( 84, 261 ) = 7308

Step 1 : Place the numbers inside division bar:

Step 2 : Find a prime number which divides both numbers.

In this example we can divide by 3. If any number is not divisible by 3 write it down unchanged.

Step 4 : LCM is a product of numbers into L shape.

LCM = 3 · 28 · 87 = 7308

This solution can be visualized using a Venn diagram.

The LCM is equal to the product of all the numbers on the diagram.