I do it all the time with digits. I will add up all the digits of a number that I see, a phone number, house number, whatever... and then add the digits that the answer comes to until I am down to a one digit number. Then I decide if I like the number or not. If I like it, I am satisfied with the effort. If not, I just mentally throw it away. I never thought it was obsessive, just something to occupy my mind. I guess if it is not bothersome, then it isn't a problem. If it bothers you, it is maybe something to talk to your T or p-doc about.

BTW, I hated math when I was in school.