[Wiki] Arithmetic Reference

Is there a simple arithmetic reference?
I'm looking for just a simple summary of the various arithmetic functions available, such as if there is a 'round down' or a 'standard shortcut for round down'?
If there are functions like 'modulo' and so on.

For a simple function I'd want to do is ((Stat)Modulo2 - 5) to try figure out things like modifier stats and so on.  Or to be able to say rounddown((Stat-10)/2).

For rolls?  https://wiki.roll20.net/Dice_Reference#Rounding_Ro...

[[floor((stat-10)/2)]] and [[floor(stat/2)-5]] are/is (they give the same result) the most common way to figure out D&D ability bonuses.

Yeah, I was also thinking of things like the abs() function which has appeared, which can be used to calculate 'failed by n lots of k' type arithmetic.
I suppose I'm just used to having more 'hard reference/glossaries' for things.

*nod*
Afaik, the only other reference we have to allowed math functions is a little up the same page :https://wiki.roll20.net/Dice_Reference#Including_A...
where we can infer that + - * / and % are valid since you have to escape them if you want them in a description.  (And I have used all of those in equations as well. :) 

There are several suggestions in the suggestions forum for additional math functions.  In many cases these are particularly for use in the character sheet templates though the need for those has lessened a bit with sheet helpers since we can use the javascript math library.

I replicated the JavaScript Math library for autocalc functions on character sheets. Many of those calculations can be used in rolls as well, although any calculation which has to reference the same value more than one can't be used if your "value" is the result of a dice roll. (That said, rolls have access to some things autocalc fields don't. For example, max(x, y) requires referencing x and y once each which you couldn't use to get the max of two dice rolls, but rolls give you access to keep-high and keep-low which produce the same results as min and max, respectively. Autocalc fields cannot replicate random(), but dice rolls are random.)

sign(x), trunc(x), and atan2(y, x) don't work for x=0

Of course, thanks to sheet worker scripts, that work isn't really necessary any more, but it's still there and may prove useful. =)