For you Lehrer fans-- if you haven't already heard, Lehrer has relinquished all rights to both his songs and his recordings thereof. At his website you can, as of this date, still download all of his recordings (he plans to shut the whole site down at some point "in the not too distant future").
Fun trivia: Lehrer and Stephen Sondheim went to summer camp together.
The fundamental, decades-long problem with math instruction is that the only meaning that numbers have for students is whether their answers are "right" or "wrong". The only difference between learning traditional, memory-based operations and learning concept/theory-based operations is the degree to which students (and parents) are confused in getting there.
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