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Cool Math Video

A New way (to me at least) to do complex multiplication

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( 7 comments — Leave a comment )
ross_teneyck
Apr. 19th, 2010 08:01 pm (UTC)
I hadn't seen it laid out that way before, but when I need to do multiplication in my head that's often the way I do it.
aelfie
Apr. 20th, 2010 12:29 am (UTC)
I've never seen this before and I totally find it fascinating. I will have to teach this to the kids.
mollygm
Apr. 19th, 2010 11:02 pm (UTC)
That's exactly what I was going to say. That's how I do it in my head, but from the big numbers down to the little ones. whenever I try to explain it to someone, they look at me like I'm nuts.
allanh
Apr. 20th, 2010 12:31 am (UTC)
That's how *I* was taught multiplication in grammar school. This would have been in the late '60s/early '70s at the University of Chicago Laboratory School.

Only after we'd mastered this method, were we allowed to use the "traditional" multiply+carry method.

After I'm-not-counting-how-many-years of using the "traditional" method, I'm still faster and more accurate with the method shown in the video.


aelfie
Apr. 26th, 2010 07:18 pm (UTC)
Oh. And it also means not doing things like asking them to identify things (i.e their letters) or doing anything vaguely academic like singing the alphabet song. Learning starts at First grade. Not before.

Now this doesn't mean you stamp down on them if they figure something out. I didn't teach either of the girls how to write their name, they figured it out on their own, just through osmosis. I neither encourage them to write it nor to practice. If they want to do so, they can, but there's no pressure from me for them to do so.
mollygm
Apr. 26th, 2010 04:19 pm (UTC)
I think I've figured Waldorf out! You can be academic with your kids as long as it's math and not literacy!
aelfie
Apr. 26th, 2010 07:13 pm (UTC)
No academic work means, no academic work. If your child asks where the sun at night the response is not "Well, the earth is rotating and its still there, but we can't see it. Blah, blah, blah" Its too factual and pulls them into their head. We want young children to remain in their bodies.

You are supposed to tell an imaginative, descriptive story (i.e. Well, the sun goes to bed you see, if you look closely you can see him putting on his red pajamas...) Or, you'll see a lot of kindergarten teachers respond vaguely like "hmmmm, yes. That's a good question to ponder...I wonder where the sun goes at night. Hmmm." The thought behind that is that when a young child asks you a question, he already has an answer in mind. And their answer will be a lot more creative than anything we can come up with!
( 7 comments — Leave a comment )

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