Unfortunately, none, so you have to write your own functions to achieve this. Something like this should work...
Untested, as I'm at work. Some of that uses the 'old' Blitz way of doing things, but should still work in BlitzMax. There may be a better way of doing it to, but that was the first that entered my head.
Function FormatNumber$(num#,places) Local output$ output$=num:*(10^places) Return Left(output,output.length()-places)+"."+Right(output,places) End Function
Untested, as I'm at work. Some of that uses the 'old' Blitz way of doing things, but should still work in BlitzMax. There may be a better way of doing it to, but that was the first that entered my head.