By Jerry Burkhart When math teachers talk about what they do for a living, the reply is often something like “Oh, I was never very good at math.” In fact, this lack of confidence in math ability seems so pervasive as to be more cultural than personal. As an experiment, try typing “I used to be good…” into a search engine. “I used to be good at math” will probably show up high (maybe even first) on the list of…