Nope - it's more blindingly obvious than that.
"Mod" returns the remainder of a division
"Round" rounds a number normally (ie. up if >=n.5, or down if <n.5)
"Floor" always rounds down ("Int" does virtually the same thing - it's just a bit different with negative numbers)
"Ceiling" always rounds up
Since you're using a counter though, you could just change the number of significant figures in the object properties (I believe this would only change the value displayed, but not the actual value being stored - haven't tested it though).