The link you provided didnt work, what I was wondering is there a place on the internet with free games that help you train your memory and help you develop...
Remove the point of the adress. Regards. markhilton2000 <markhilton2000@...> a écrit : The link you provided didnt work, what I was wondering is there a...
silly question? But if a school child asked the question, what would be an inspirational answer? Historically, when would the ability to square root quickly...
Hello all from my childhood I was fascinated by reading about mental maths, however, I never got significant results and I picked up other things as well. But...
... things ... a ... find/ ... right? ... multiplying ... Sticker? ... you ... multiplication? ... usually ... concentration, ... Hi my friend! Speed math...
Hello Nodas nice to read from you!..thanks for answering this patiently. To give you my earlier results found in an old listing: I factorized all numbers up to...
... I love this tool: http://www.jimmyr.com/blog/speed_math.html I wish there were more tools like this to help me with mental calculation training and memory....
Hello Reto thx for replying For 1 on 5 digits multiplication good result would be for me if it's done within 10-20 seconds. And the one digits won't be 2,3,5...
... Better to do it as 34 × (100 - 14) = 34 × 100 - 34 × 14 34 × 14 = 24² - 10² = 576 - 100 = 476 3400 - 476 = 2924 Scott Horne...
P Scott Horne
patrick.horne@...
Jun 7, 2007 4:15 pm
2216
34x86=34x50+34x36=1700+1225-1=2924 ... PSH> Better to do it as PSH> 34 × (100 - 14) = 34 × 100 - 34 × 14 PSH> 34 × 14 = 24² - 10² = 576 - 100 = 476 PSH>...
Oleg Stepanov
olegstepanov@...
Jun 7, 2007 8:04 pm
2217
Interesting. I would have done it this way, since 34 is so near a third of 100: 34x86=(102x86)/3 = (8600+172)/3 = 8772/3 = 2924 A short division like this at...
ED> 34=50-16 ED> 86=100-14 ED> 14/2=7 ED> 34-7=27(00) ED> 16x14=224 ED> 27(00)+224=2924 ED> Emmanuël Too long and difficult. ...
Oleg Stepanov
olegstepanov@...
Jun 9, 2007 11:17 am
2220
The written process seems long to you, but actually it's much simpler because I rather work in visual mode and not purely arithmetic. I read 34 x 86 I see 224...
If someone could wave a magic wand and you guys could know the 100 times table without needing to do sub calculations, would you feel sad about it? Is your...
It's not necessary to know the table up to 100 x 100; I know it up to 30 by 30 , but did not study; I have a cartography of the table in my head, I designed...
I read recently about a chap named Cohen. An example was given of his ability to factorise a 6 digit number. I looked up factorisation web pages and saw one...
Fermat. Sorry. I woke up and the right name came to mind. Mike ... From: Michael Curtis <mick_curtis@...> To: MentalCalculation@yahoogroups.com Sent:...
AxB=? A=50-a B=100-b AB=(B/2-a)[00]+ab 86/2=43 43-16=27 2700+224=2924 Just idea. ED> The written process seems long to you, but actually it's much simpler ED>...
Oleg Stepanov
olegstepanov@...
Jun 10, 2007 12:29 pm
2226
I am a new member. I am interested to memorise calendar. Will anybody help me out as to how do i start in this matter. Is there any book on this subject or any...
Hi! Ok, here are a few tricks: Firstly, it is good to know a few starting points, eg. On which day of the week was your own date of birth? How about those of...
... to ... I beg your pardon for my poor English! I would say there are two schools of thought. One way you can read everything you can find about the topic...
Yes, i know its late , but i read the last messages now. I prefer this way : In 34 x 86 I hear "seventeen , seventeen.." , i.e. 34 x 86 = 17 x 17 2 = 289 (x...
Sorry , I am later to reply. The best way to multiply any two digit numbers is to learn abacus. My students can easily do these. But it is possible only upto...
I dot not believe there is a "best" way - the idea is a bit dogmatic*; although I have seen very skilled calculator even using mental abacus. A cartography of...
hi Can u pls explain how did u arrive at this? Thanks Jyoti Rane ... From: javiergijn <fabesconalmejes@...> To: MentalCalculation@yahoogroups.com Sent:...
How did you come to 17 x 172 = 289 x 10 is there some quick way. Mark Yes, i know its late , but i read the last messages now. I prefer this way : In 34 x 86 I...
... Here's what Javi was getting at: 34 is a multiple of 17. (2x17) 86 is CLOSE to a multiple of 17. (5x17 + 1) So 34 x 86 = (2 x 17) x [(5 x 17) + 1] = [(2 x...
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