Here is a conversion table I found quite useful. Others might find this useful as well ...

1 Unit

10 Ten

100 Hundred

1000 Thousand

10,000 Ten Thousand

1,00,000 Hundred Thousand or 1 lakh

10,00,000 Thousand thousand or 10 lakhs or 1 million

100,00,000 Hundred Lakhs or 10 million or 1 crore

1000,00,000 Thousand lakhs or 100 million or 10 crore

10000,00,000 Ten thousand lakhs or 1000 million or 100 crore or 1 billion

Cheers!