The main difference between the Indian and International numeral system is the placement of commas (separator).
In the Indian system, lakhs and crores are written after thousands, whereas in the International system, millions and billions are written after thousands.
In the Indian system, comma starts from the 3rd digit from the right and are palced after every 2 successive digits.
In the international system, all commas are placed at 3 digits from the right of the number.