Bad at math

I have a friend who is a cement mason by trade. Like many construction jobs, in order to be a good cement mason you need to be competent at math. Since I am somewhat math challenged, my friend refers to my mathematical errors as "history major math." As I write this it occurs to me that this may be my friend's polite way of calling me "college boy," but I don't think so.  In any event, my point is that I am not good at math so take the analysis that follows with a grain of salt.