How to compute mathematical operations in Excel sheets?

I have two different sets of data in excel. My excel sheet consists of some parameters like intrusion, left, etc. 1st set of data is the final stage and the 2nd one is the initial stage. I have many tooth number like (17,16,15) etc. For each corresponding tooth no. there are different parameters. Now I want to get the difference of those parameters from the final and initial stage and store those values, as I want to use those values in some application. How should I start? I am attaching excel sheet you can checkss.xls (119 KB)

There is Expression action in RPA Express that you can use for calculations, but you need to convert the values to Numbers to use it. It looks like all the calculations you need to do can be done in Excel itself using formulas, without the need to do it in RPA Express.