fractions, decimals, and percentages. as his teacher, kami thordarson, explains, students don't normally tackle inverse trig until high school, and sometimes not even then. but last november, thordarson began using khan academy in her class. khan academy is an educational website that, as ...
it's not clear that the 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 kid in fifth grade who has mastered high school trigonometry and physics...