My father did the same, and it helped me immensely. He also did eyeball estimates of weights/volumes/etc. (farmers excel at this, IME)
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Same here—and a lot of "air" calculations too. At the time it felt too compicated, but I later realized it was invaluable
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what do you mean by "air" calculations?
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Minimally, he'll learn what envelopes were before they fade entirely from our material culture!
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Your tweets about parenting make me want to have kids!
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Have your read Fermi's calculation on how many piano tuners in Chicago? Amazing BOE calc. http://bit.ly/2o87AvS
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Love doing this with my nephew. His estimate for how many legos are sold a year was off by 20%. Not bad for no sources at all.
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That's what Feynman's father did with him. They figured out once that a T. Rex could put his head through the window on the 3rd floor.
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Having been a kid who gained an intuitive grasp of numbers this way: Yes, this is extremely valuable.
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Math is a funny thing in that people do math differently depending on their thought process. Kids need to experiment to find their math zen.
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Nice to see people still use back of the envelope thinking.
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As someone who did not enjoy that: I share your certainty!
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Enrico Graham
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Cool that you are doing this, and cool that you are sharing part of your parenting journey. Did you learn your style from your father?
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Fast bounding/BOE calcs usually survive contact with reality quite well. Over detailed plans & perfect numbers not so much. ;-)
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