When I first started, I was told to report the numeral with each digit shown. It kinda made sense, since the table only sees one number at a time when reporting with one hand. In the case of #11, I always wondered how it should be spoken as I show each digit - "e", "leven"? "elev", "ven"? Maybe say it all at once before showing the digits? Or say it after showing the digits? ...sigh...so many choices not covered by the manual...
Remember, this is all about communication - we are communicating to the table the number of the player charged with the foul so it can be properly recorded in the book. It doesn't matter if we say it the "proper" way, but don't speak loud enough for the table to hear. Or, I could be doing all of the "proper" mechanics, but my partners are doing it differently, and the table gets confused because of the differences. Usually the best way to communicate is through consistency, and the NFHS (or NCAA) has set up a reporting procedure so table personnel have a better chance of receiving what we are trying to communicate. But the bottom line is we still need to be able to communicate with the table.