Hi Vedrana,
Its Indian standard of counting numbers. For example:
1 One
10 Ten
100 Hundred
1000 Thousand
10,000 Ten Thousand
1,00,000 One Lac = hundred thousand = 100,000
10,00,000 Ten Lac = One Million = 1,000,000
1,00,00,000 One crore (cr) = Ten Million = 10,000,000
I hope that would help.
cheers.
Shan