![]() Oh, and you mentioned the system that Granth Thakkar uses in a PM. Also, I’ll read over your old posts for more information. Would you recommend memorizing squares to increase speed? Right now I just know them up to 15. I’ve used it a lot in algebra, but I never considered how it lends itself to mental math (cool stuff). You also mentioned the difference of two squares. I just bought Arthur Benjamin’s book, so I’ll start reading through that. One method may lend itself better to a particular calculation, or the problem might just strike you in a way where it happens to fit with one system over another. I didn’t consider it at first, but in hindsight it makes sense learning multiple methods. I appreciate you taking the time to explain things. Thank you so much for the information, Kinma. I’ll be happy to explain any of the methods used above. Something you need when you get to 20x20. If both the 9 proof and the 11 proof come out correct you can be certain that your answer is correct.Īlso it builds your mind to be able to juggle large numbers. This will tell you wether your answer is correct. Imo, it is best to start out using all the systems and calculating a multiplication using them all.Ģ0 X 30 + 20 X 7 +30 X 3 + 3 X 7 = 600 + 140 + 90 + 21 = 851Īlso learn to do the 9 proof and 11 proof. IMHO, there just isn’t any system that is best.ĭepending on the numbers given there is a generic method and there are shortcuts. There didn’t seem to be a consensus about which mental math system is best. Any guidance at all would be greatly appreciated. My suspicion is that one method may work best with smaller numbers (like 4 x 4) and lend itself more to rapid calculation without looking at written numbers, whereas another system–maybe like the one Granth Thakkar uses–may be better suited for longer calculations but would be inherently cumbersome without looking at numbers for reference. In the video, however, he looked at the numbers for reference, and he wrote down numbers as they were computed. I’m leaning towards Arthur Benjamin’s method (although I’ve never seen him compute square roots), but my concern is that I’ll invest 100 hours or so in one method just to find out that it’s deficient in one particular area, or an entirely different method is superior.ĭoes anybody know what system Granth Thakkar uses? I saw a video of him (or perhaps it was a similar competitor) doing 20 x 20 multiplication in his head. I’d also (ideally) like the number to be produced from left to right, if possible. I’m looking for a system that allows for rapid multiplication of large numbers (maybe up to 4 x 4) and computation of square roots (and perhaps other fractional powers), and I’d like to do this without looking at written numbers for reference. I’m guessing this is because “best” really depends on what you’re hoping to achieve, so I’ll start there. ![]() ![]() I actually did read through all the others, but there didn’t seem to be a consensus about which mental math system is best. ![]() My role will therefore be to adapt to the psychology of the student, find the source of the blockage and do everything to remedy it.Ĭoncretely, it is to return to the dark areas or even the bases of the course according to the difficulties of the student, and make him understand the logic through simple explanations, concrete and very pictorial examples all this by making the course as pleasant as possible.I apologize for what probably appears as a redundant thread. I do not seek to rehash the knowledge seen in class, but to inculcate the logic and the approach that must adopt the student to understand and retain the concepts seen, and those he will see later in class.Ī student is not in difficulty with scientific subjects because "it is not made for that", but only because of a blockage at the source that prevents him from becoming familiar with these subjects. I adopt a different learning method than a classical high school / high school teacher. Hello, I am a student (under license at the University Paris 7) offering private lessons or homework help in science subjects for students from the 6th to the Terminale in Paris.
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