This method is to find LCM of given numbers.
Let’s say we want to find LCM of 20 and 60.
First write 4 and 20 as shown below
Divide 20 and 60 by 2
Divide 10 and 30 by 2
We can not divide any of 5 and 15 by 2 perfectly. So divide them by three.
Here 5 is not divisible by 3 so 5 is written as it is.
Divide 5 and 5 by 5.
Stop this process when last row has all 1s.
So the LCM is 2 × 2 × 3 × 5 = 60
