Guys, to answer this question I have to repeat: I don't practice multiplication of big numbers in my head because it's not interested for me, the Calender is...
1840
14/m/usa
mrcubist
Jul 4, 2005 6:03 am
Is there any site about multiplying two numbers mentally? Is there any way to multiply two numbers without having to remember a lot of numbers [except carry's...
1841
Emmanuel/DATA
emmanuel_dub...
Jul 4, 2005 7:12 am
Hi; To be able to calculate quickly and easily any 2 digit number, extend your multiplications table to 25 x 25; (although up to 12 x 12 could be sufficient...
1842
Kurien Thomas
rajukunjumol@...
Jul 4, 2005 7:39 am
Subject: cubic root/square root - mental calculation. Regarding: details of world records , if any. Hi, As informed earlier I'm capable of doing mentally...
1843
Vikas Mishra
vikasmishra_...
Jul 4, 2005 7:41 am
... "Trachtenberg's speed system of basic mathematics" might be a good place to start. http://www.amazon.com/exec/obidos/ASIN/0285629166/rekordklubsaxoni ...
1844
Emmanuel/DATA
emmanuel_dub...
Jul 4, 2005 8:03 am
Thomas, concerning cubic root I extract roots from 15,18,21,24 in less the 30 seconds for odds numbers. It takes me much more time for even numbers and numbers...
1846
Robert
mrcubist
Jul 4, 2005 3:33 pm
I have looked into the Trachtenberg system a little bit. But are Trachtenberg's multiplication procedures designed for the mind? i.e. can an average/above...
1847
George Lane
george972453
Jul 4, 2005 6:00 pm
Hi there. I'm not aware of any official world records in the area you describe, since records in the square root area are usually answers to inexact roots of...
1848
RobertLoggins
RDLoggins
Jul 4, 2005 8:58 pm
Kurien, The times you posted for the square root extraction of perfect squares would not be considered fast by anyone practiced in mental calculation. Times...
1849
Brian Ritchie
msgibraltar
Jul 5, 2005 7:33 am
I'd actually love to see how you do it and some examples if you can. I'd be really grateful. I'm a newbie to this and joined the group to learn the tips and...
1850
Kurien Thomas
rajukunjumol@...
Jul 5, 2005 7:33 am
Robert Loggins, Thank you for your immediate reply/response.However I am unable to understand fully /interpret the contents of your reply relating to squire...
1851
Michael Curtis
mick_curtis
Jul 5, 2005 4:10 pm
Do you want to look at 2 numbers and, while looking at them, say from right to left the answer? Also, recently, there was described a very achievable way of...
1852
RobertLoggins
RDLoggins
Jul 5, 2005 7:27 pm
Kurien, My detailed explanation/examples will follow this post. I was saying to you that your time of 30 seconds to find the square root of an 8 digit perfect...
1853
matsuo_russell
Jul 6, 2005 4:26 am
I'm glad Robert clarified his point for Kurien. I was about to comment but now all I have left to say is that there is perhaps too much emphasis on speed in...
1854
issam khneisser
issamn_1
Jul 6, 2005 5:26 am
collegues, Integuer square root are easy to do, to find the square root of an 8 digit perfect square number take less than 5 seconds. best regards Issam...
1855
alberto coto
alcoga34
Jul 6, 2005 3:38 pm
Congratulations, Ralf. The second Mental calculation World Cup is a great new for mental calculation and mental calculators. Best wishes. Alberto Ralf Laue...
1856
jean2ms
Jul 7, 2005 7:28 am
Hello, Does that mean that we already should ask for an inscription ? Because 16 months, it is so far! ;) Thank you. And congratulations for London 2012! Jean....
1857
ralf_laue
Jul 7, 2005 1:09 pm
... Hello, no, there is no need to send the form now. However, an informal e-mail if someone isinterested in taking part would be nice. This can help us to...
1858
jean2ms
Jul 7, 2005 3:19 pm
... Ok. Thank you for your answer Ralf. Jean....
1859
Arun Mangal
arunmangal@...
Jul 7, 2005 3:22 pm
Hello Rafe, Arun Mangal from India Great to know about 2nd MCWC I am interested to take part in this event again. When should I send my application form ...
1860
mnempi
Jul 8, 2005 6:48 am
oops! this had been intended as a private email to ralf, but I mistook the REPLY function, and now the request of Ruediger Gamm and me is public. I am very...
1861
Ralf Laue
ralf_laue
Jul 8, 2005 12:00 pm
Hello, it is a pleasure for me to announce that I have received the documentation about a new world record which is now verified: Jorge Arturo Mendoza Huerta...
1862
Michael Curtis
mick_curtis
Jul 8, 2005 2:41 pm
... http://www.recordholders.org/en/events/worldcup/2004/ ... ___________________________________________________________ How much free photo storage do you...
1863
Arun Mangal
arunmangal@...
Jul 8, 2005 3:22 pm
no matter ! But it is intersting to know german lanfuage Arun Mangal INDIA ... From: "mnempi" <voigt@...> To: <MentalCalculation@yahoogroups.com> Sent:...
1864
rob1729
Jul 10, 2005 12:07 pm
Thanks Ralf!! The Mathematikum looks like a fascinating place. Have you seen these books before? They are the books from which Wim Klein took his methods. ...
1865
rob1729
Jul 10, 2005 12:16 pm
This link might be useful for viewing the first book: http://www.lizardtech.com/download/dl_options.php?page=viewers ... Wim...
1866
RobertLoggins
RDLoggins
Jul 11, 2005 5:09 am
The 4th of July holidays here in the USA ( to celebrate our release from English oppression) have now ended and I will have time to give some examples of the...
1867
Ryan Yeo
stlife999
Jul 12, 2005 10:32 am
Hi Robert, I am also new to this group and would like to improve my mental math ability. Please add me to your mailing list on the topic so I could learn more...
1868
alberto coto
alcoga34
Jul 13, 2005 3:55 pm
Hi everybody: This is a good new for me. Ten 10-digit numbers in 5 min 36 seconds is very easy . I think I could do it in less than 4. 30. Best wishes. ...
1869
Divesh Shah
mathsshow
Jul 14, 2005 11:16 am
congrats remember me i am so glad that you can do it so fast hope to see you soon divesh shah ... ...
