Find Least Common Multiple of 9 and 6 using ladder method..

LCM( 9, 6 ) = 18

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 · 3 · 2 = 18

This solution can be visualized using a Venn diagram.

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