Find Least Common Multiple of 1, 2 and 2 using ladder method..

LCM( 1, 2, 2 ) = 2

Step 1 : Place the numbers inside division bar:

Step 2 : Find a prime number which can divide at least two of your numbers.

In this example we can divide by 2. If any number is not divisible by 2 write it down unchanged.

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

LCM = 2 · 1 · 1 · 1 = 2

This solution can be visualized using a Venn diagram.

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