Is there a known issue with trunc()? trunc(todecimal("4.81"),2) = 4.8

harrisont606 , issue is with all the versions of Appian I guess.
I have observed this in different versions of Appian. It is better if you can raise a support ticket.

The problem isn't necessarily product(Appian) specific. This issue can actually be reproduced in other programming languages, and is a side-effect of the way decimal numbers are stored and operated on.

Only fixed can resolve this problem. Use fixed(4.81,2). 
This should resolve the issue.

Thanks. I found an alternative that works perfectly : rounddown(todecimal("4.71"),2)

Thanks. I found an alternative that works perfectly : rounddown(todecimal("4.71"),2)