Theory:

Let us see the comparison of Indian and International system of numerals:
 
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Commas are placed to the numbers to help us read and write large numbers easily.
In the Indian system of numeration, the first comma is placed after the hundreds place. Commas are then placed after every two digits.
Example:
Let us take the number \(35687941523\).
 
As per the Indian system of numeration, the commas placed are \(35,68,79,41,523\).
In the International numeration system, the first comma is placed after the hundreds place. Commas are then placed after every three digits.
Example:
For the same number \(35687941523\), as per the International system of numeration, the commas placed becomes \(35,687,941,523\).