- $1200 would be pronounced as "twelve hundred dollars"
- %1,200 would be pronounced as "one thousand two hundred dollars"
The higher the figure, the more commas and decimal points or periods there are and that's where it can become more difficult and confusing. There are plenty of websites that will help you to understand where to place it correctly. If you place it incorrectly it could make a huge different between a thousand or even a million.
Another helpful way to find out how to write monetary amounts correctly is by using a currency converter, there are plenty online, an easy one to use is
You simply enter the amount you want and select the currency and the answer will be given to you in the correct format.There are plenty of books on the market also that will help you to understand how to write high numbered figures and when and where to correctly place the decimal point and where to place the commas.
When writing out a check or an invoice you can also prefix the amount with the dollar sign $, or some may prefer to use US$, or even USD this is important, especially if you are dealing with an international company which may be used to dealing with several different currencies. There are also many other countries that use the dollar currency, yet these probably will not equate to the same as the US Dollar, therefore it is also important to include some indication to the currency being the US Dollar.