Even if Khan is truly liberating students to advance at their own pace, it is not clear that schools will be able to cope. The very concept of grade levels implies groups of students moving along together at an even pace. So what happens when, using Khan Academy, you wind up with a ...
In fifth grade math, you build on what you learned in third and fourth grade. If you kept up in fourth grade math, you will probably do well in fifth grade math. Even if you struggled in fourth grade, there are ways you can catch up. You...