I know this isn't something which is highly of demand, but it does come in quite useful and has worked for me over the years for a quick sum if I am too lazy to work it out. (Good for quick RP situations)
If you could add /calc(ulator) [firstNum] [mathType (+, -, *, /)] [secondNum] -> It would return the completed math.
I have attached a script via PasteBin here -> https://pastebin.com/4FMqwLf4