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Nice title, eh? Let me preface this with the admission that I know just about nothing about dyslexia. Clinically, I mean. The reason for this post is that Angela (Mother Crone) left a very interesting comment on yesterday’s post concerning how mental math has helped her daughter, who is dyslexic. How many [...] “In mathematics the art of proposing a question must be held of higher value than solving it.” Georg Cantor About a month ago, Penny commented on this post. Here is an except from that comment: “Frankly, I don’t care if an elementary school child can add long columns of numbers in their head [...] To check multiplication of single digits by longer numbers with playing cards: We’re going to use what I call “numbers crunching” to check. That is the same as using the nines-remainders. You do know how to get the nines-remainder of a number, don’t you? It’s very simple, but it takes a bit of explaining. [...] Math Mojo has got some surprises for you. New lessons on how to improve your basic math skills, and videos! Professor Homunculus is getting his Video Mojo workin’ to bring you some great new stuff. The first set of videos will be about how to practice multiplication using playing cards. So grab a deck [...] A few posts ago, I offered some tips about how to check large division problems without having to multiply huge divisors and quotients to get even huger dividends. One of the drawbacks to using the “crunch” method, which I described, is that it is not 100% accurate. Often, people who need to defend [...] We’ve been talking about using factors to make long-division problems easier, sometimes being able to turn them into a manageable sequence of short-division problems, in which no paper and pencil (and certainly no calculators!) are needed. Want to try another one? How about 962/52 ? Well, they’re both even, so that’s [...] In the last post we looked at the problem of 926/18, and we simplified it to 463/9, so we could make it a short division problem. What if the problem had been 927/18? Both numbers are not even this time, so it is not readily apparent if they have common factors. If you know how [...] (Is that title an oxymoron?) Imagine you have to do this division: 926/18 How would you do it? Would you rewrite it with that funny division symbol (“division bracket,” or “right parenthesis followed by a vinculum over the dividend”)? Would you use a calculator? (Please say “no” to that!) After you rewrote it, would [...] This post is a continuation of the other posts about the video on YouTube entitled “An Inconvenient Truth” with M.J McDermott (not to be confused with Al Gore’s film) which concerns the dismal state of American basic math education in public schools. You can view it here. M.J. had two good premises, but her conclusion [...] (If you use a little imagination you can guess the title of this article.) This article concerns M.J. McDermott’s youTube video about the sad state of basic math education in America. You can visit the video here, or you can simply scroll down to the next entry here in the Math Mojo Chronicles, where it [...] |
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