Hi Scot :)
I believe what you're looking for is the FormatNumber function, which allows you to apply numeric formatting to an integer value. The following expression should do what you want:
CalculationResult:=FormatNumber(CalculationResult,"en-GB","{0:F}");
If you pass the result of your calculation into the CalculationResult variable, this expression will add two decimal places to its number value (if it doesn't already have them) and then pass it right back to the same variable.
The second argument defines the number culture, and the third argument defines the formatting you want to apply, which in this case is to add decimal points to the number. As written above this will add two decimal places by default, but if you want to change this amount you simply add the number of decimals you want after the "F", For example, if you want to add four decimal places, you would write it like this:
FormatNumber(CalculationResult,"en-GB","{0:F4}");
I hope that answers your question. If you're having any problems please don't hesitate to let me know. :)