It is very easy to know the single of a Patti, whenever a Patti is formed, then adding it to whatever number is in the last, it is called the single of that Patti like – 183 This is a Patti, now on adding 1+8+3, the number 12 comes, so the last digit in 12 to see it is 2, so it is a single of 183 leaves, in the same way, you can know the single of all the Patti.