Why does many ppl write numbers wrong?

I see many ppl on this forum writing numbers like this:

1,00,000 = (100.000)

5,00,000 = (500.000)

Why is that?

 

I believe numbers in the bracket are european format. For instance:
$1,345.56 is written $1.345,56

Your format number above on the left I have never seen. For 1,00,000 and/or 5,00,000 did you mean to write 100,000 and/or 500,000???

 

2,34,56,789 - > Indo - arabic format.
-------------
23,456,789 -> western

That's why Americans use "Million" and Indians use "Ten lakhs".

 

Ok, thanks.

 

explain pls

 

Also

We Indians say Thousand Hundred 1,100
Western people say Eleven Hundred 11,00

We Say 1 Lakh 1,00,000
They Say Hundred thousand 100,000

 

You ask this and not why people choose to use text speak on forums? (people not ppl - sorry, had to say something)