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Indians use lakh (100 000 -> 5) and crore (10 000 000 -> 7). They also group the digits differently.

• akavi 4y ago
  And then combine them into lakh crore (1,00,000,00,00,000 -> 12) Really the worst system of the 3.
  • Arnavion 4y ago
    1 lakh crore is written as 10,00,00,00,00,000. The grouping is perfectly consistent.
    • thaumasiotes 4y ago
      Is it? If 1 lakh is 1,00,000 and 1 crore is 1,00,00,000, wouldn't the consistent grouping for 1 lakh crore be 1,00,000,00,00,000? How do you get to 10,00,00,00,00,000 by applying the same rules that apply to lakh and crore?
      • Arnavion 4y ago
        The consistency is "three digits in the first group and two in all others".
        • thaumasiotes 4y ago
          But now the written form of the number is completely disconnected from the spoken form. That means you have to write out the whole number first, and then go back through and add separators in random locations. It's a rule that will tell you how to write "any number" equally, but it makes all the numbers inconsistent with each other.