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New Math

アーティスト：Tom Lehrer  アルバム：The Remains of Tom Lehrer  作詞：LEHRER TOM  作曲：LEHRER TOM 

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Spoken introduction: Some of you who have small children may have perhaps been put in the embarrassing position of being unable to do your child's arithmetic homework because of the current revolution in mathematics teaching known as the New Math. So as a public service here tonight, I thought I would offer a brief lesson in the New Math. Tonight, we're gonna cover subtraction. This is the first room I've worked for a while that didn't have a blackboard, so we will have to make do with more primitive visual aids, as they say in the ed biz. Consider the following subtraction problem, which I will put up here: 342 minus 173. Now, remember how we used to do that: But in the new approach, as you know, the important thing is to understand what you're doing, rather than to get the right answer. Here's how they do it now: You can't take three from two, Two is less than three So you look at the four in the tens place Now that's really four tens So you make it three tens Regroup, and you change a ten to ten ones And you add 'em to the two and get twelve And you take away three, that's nine Is that clear? Now instead of four in the tens place You've got three 'Cause you added one That is to say, ten, to the two But you can't take seven from three So you look in the hundreds place From the three you then use one To make ten ones . . . (And you know why four plus minus one Plus ten is fourteen minus one? 'Cause addition is commutative, right!) . . . And so you've got thirteen tens And you take away seven And that leaves five . . . Well, six actually . . . But the idea is the important thing! Now go back to the hundreds place You're left with two And you take away one from two And that leaves . . .? Everybody get one? Not bad for the first day! Hooray for New Math New-hoo-hoo Math It won't do you a bit of good to review Math It's so simple So very simple



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