I find that the problem with math education is the sink-or-swim approach. Everything is rapid fire, and the kids who get it first are the ones who are rewarded. So there comes to be a feeling that there are people who can do math and there are people who aren’t math people. I think that extended amount of time gives you the chance as a teacher to explain things, and more time for the kids to sit and digest everything that’s going on–to review, to do things at a much slower pace.
~ Frank Corcoran (in Malcolm Gladwell’s Outliers: The Story of Success)