You know...from my experience[ok, I try to tutor some children in math. I seem to have the same 20 or so every day], girls are actually better in math. Girls are socialized to sit down and not disrupt the entire class, which means they can actually learn their multiplication tables or how many feet are in a yard, which are the building blocks of mathematical brilliance. It's not considered masculine to sit down, learning about things that will eventually give you the knowledge to blow shit up.
Although of course, this is a small sample, and the girls might all be just children left after school... Soon we'll get all the children who actually failed math, so interesting things will happen soon.