Great thoughts, Sue and fairly accurate, I would say being the person who thinks about why there are three "c" answers in a row and attempts to figure out whether there is a conscious pattern or not. :-)

Another data point here: DS8 has a 70 pt spread, is terrible with writing, amazing with verbal, and does in fact calculate everything from scratch every. single. time. Timed math facts were the absolute worst in second-grade with a teacher who has convinced him he is not good at math because of it.