MS> The _top_ reason most kids who reach your grade level without
MS> adequate math skills to succeed in physics is that math is a
MS> _sequential_ subject. If the kid doesn't learn math just one
MS> year, by whoever's fault, he will be unlikely to recover and
MS> be able to succeed in later math and math-based courses.
I'm not sure this is accurate. I'll defer to those who teach 
math, but it seems to me that the content is essentially a rehash 
with embellishments thrown in from 3rd to 7th or 8th grade. My 
kids mastered addition, subtraction, multiplication, and division 
by third grade. Math did not substantially change for them until 
they took algebra.
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