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5112
Mental Calculation World Cup 2014 registration period ends in 68 day Hello, This is just a reminder that the registration for MCWC 2014 is open. You will help with the organization if you do not wait until the very last moment
Ralf Laue
Mar 25
#5112
 
5111
Re: New training files Hi George, first of all, I'd like to congratulate you for your effort and dedication. I've been looking for some material or any methodology that may support
JOSE CARLOS-BAPTISTA
Mar 24
#5111
 
5110
Re: Mental Calculation World Cup 2014 Announcement Hello, The short answer is: Everyone can request a special format for each task, including task 5. The request should be sent by e-mail until 1 July. Ralf
ralf_laue
Mar 6
#5110
 
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5109
Re: Mental Calculation World Cup 2014 Announcement Dear Ralf and everyone, Thanks a lot for letting us know about the MCWC-2014 (city, venue and the new task) . I have a question. In the update Rules
nodden_1984_mes_gr
Mar 6
#5109
 
5108
Mental Calculation World Cup 2014 Announcement - Please help to circulate this call for registrations - Mental calculators from all over the world are invited to the 6th Mental Calculation World Cup 2014!
Ralf Laue
Mar 5
#5108
 
5107
Re: New training files Hi George, That's a great feat! It will be splendid if you can send us a copy of your great work! Thanks in advance. Warmest regards, Edwin & kids
Edwin Tapang
Mar 1
#5107
 
5106
Re: New training files Hi George, I would love to have the workbook! Indeed, If Willem uses his dropbox account, I would love to have a link. Cheers, Kinma.
kinma216
Feb 23
#5106
 
5105
Re: New training files Hi George, Fortunately I have a dropbox account, so if you mail me the code I need, I can open your file and save it. Did you already book your flight: if you
A.W.A.P. Bouman
Feb 22
#5105
 
5104
Re: New training files Hi George I would like to have a copy by mail Thanks about your great work and effort From: MentalCalculation@yahoogroups.com
Adi Tamir
Feb 22
#5104
 
5103
Re: New training files Hi George, Could I get a copy please? Thanks a lot! Chris To: mentalcalculation@yahoogroups.com From: george972453@... Date: Fri, 21 Feb 2014 16:49:17
Simba .
Feb 21
#5103
 
5102
New training files Good morning/afternoon/evening to everyone;   A few days ago, I completed the testing of the latest version of my Pegasus mental calculations training
George Lane
Feb 21
#5102
 
5101
Re: square root Ty very much Ron From: MentalCalculation@yahoogroups.com [mailto:MentalCalculation@yahoogroups.com] On Behalf Of doerfpub@... Sent: Sunday,
Adi Tamir
Feb 16
#5101
 
5100
Re: square root Hi Adi, As you probably already know, a better square root r' of a number N can be found from an initial root r by averaging r and N/r^2: r' = (r + N/r^2) /
rondrond1
Feb 15
#5100
 
5099
square root . suppose I know that the square root of 458789 for example begins in : 677.3 what is the fastest way to calculate mentally the next digit? I will
Adi Tamir
Feb 15
#5099
 
5098
Re: Decimal numbers to Decimal powers, via Logs I love to do these calculations! They are easy to do using logs as Nodas showed. However, to keep my mind sharp, I like to do them also using different ways.
kinma216
Feb 15
#5098
 
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5097
Re: Decimal numbers to Decimal powers, via Logs Hi All, Perhaps my two papers, "The Practical Use of the Bemer Method for Exponentials" "Fast Approximation of the Tangent, Hyperbolic Tangent, Exponential and
rondrond1
Feb 6
#5097
 
5096
Re: Decimal numbers to Decimal powers, via Logs Hi Steven and everyone, For mentally doing 2.2 ^ 8.3, I would take the logarithm of it. Then, simplify to a single number of 5-digit accuracy and finally seek
nodden_1984_mes_gr
Feb 6
#5096
 
5095
Decimal numbers to Decimal powers, via Logs Hi all, Has anyone here been able to mentally raise decimal numbers to decimal powers? I have mentally done 2.2^8.3 = 695, using a table of Prememorized Common
webcash56
Feb 3
#5095
 
5094
Re: 531, 7531 and so on are not primes, why?? If we turn the numbers around: 13 135791113151719 125791113151719212325272931 125791113151719212325272931333537394143454749515355575961636567
retothejuggler
Dec 18, 2013
#5094
 
5093
Re: 531, 7531 and so on are not primes, why?? Next we have 12312111911711511311110910710510310199979593918987858381797775737169676563615957555351494745434139373533312927252321191715131197531 Compared with
retothejuggler
Dec 14, 2013
#5093
 
5092
Re: 531, 7531 and so on are not primes, why?? Hello Chris Awesome, thanks!- It`s a very funny sequence. A juggler`s Mersenne? :-))
retothejuggler
Dec 12, 2013
#5092
 
5091
Re: 531, 7531 and so on are not primes, why?? Hi Reto, 737169676563615957555351494745434139373533312927252321191715131197531 is the next prime of this format. Hope this helps, Chris To:
Simba .
Dec 11, 2013
#5091
 
5090
531, 7531 and so on are not primes, why?? For our juggling club christmas show I`m preparing some numbers and ways to "juggle" them. This way I stumbled on siteswap notation and started to look out for
retothejuggler
Dec 11, 2013
#5090
 
5089
anyone ever read le calcul rapide (French) Hello dear calulators and numbers friends :-) Has anyone ever read this book? Henri Wargée Le calcul rapide en vingt-cing leçons If you did, can you
retothejuggler
Dec 4, 2013
#5089
 
5088
Re: Accidently found factoring record Dear Reto, The questions I lose are 100% without any expedient. A friend of mine, promoted mathematician and assistant professor, gave me an impression of what
A.W.A.P. Bouman
Nov 20, 2013
#5088
 
5087
Math Encounters: Secrets of Mental Math Prepare to be mesmerized as award- winning Harvey Mudd Professor of Mathematics Arthur Benjamin demonstrates (and explains!) how to do rapid mental
mentalmathandcatlover
Nov 19, 2013
#5087
 
5086
Re: Accidently found factoring record Dear Willem I agree that this lists are very helpful. But still, puzzling out a 120 digit number is impressive. I`ll present you an easier number here to show
retothejuggler
Nov 19, 2013
#5086
 
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5085
Re: Accidently found factoring record Dear all, What Mittring has done is fining prime numbers out of a list which contents them. In German it is presented as “einziges Hilfsmittel”. In fact it
A.W.A.P. Bouman
Nov 18, 2013
#5085
 
5084
Accidently found factoring record Here http://www.youtube.com/watch?v=vK5uFP28TWY Gert Mittring is factoring very large numbers, at least he finds out how to combine them correctly .:-o.
retothejuggler
Nov 17, 2013
#5084
 
5083
New Arthur Benjamin videos Dr. Arthur Benjamin of Harvey Mudd College has 2 new videos out that my fellow mental calculators might enjoy. The first is a 78-minute lecture in Washington,
econalc
Nov 17, 2013
#5083
 
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