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Group Information

  • Members: 1048
  • Category: Mathematics
  • Founded: Oct 8, 2002
  • Language: English
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Description

The topics discussed are for example:
* advanced mental calculation tasks (like extracting roots or multiplying big numbers)
* algorithms
* books about mental calculating
* competitions, achievements and records for mental calculations
* teaching mental calculation at school
* useful computer programs
* using the abacus / soroban
Beginners' questions are welcome, but do not expect to get the solution for your homework here.

Most Recent Messages

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Mental Calculation World Cup 2012: Deadline Reminder
Hello, This is just a friendly reminder that the deadline for sending your application form for the 5th Mental Calculation World Cup (to be held 29 Sept-1 Oct
Posted - Thu May 24, 2012 12:45 pm
 Ralf Laue
ralf_laue
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Lee abacus
Does anyone know where I can purchase a Lee abacus? Any information will be most appreciated.
Posted - Thu May 17, 2012 5:42 pm
 Sastry
dasigi0
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Re: decimal cube roots
Good afternoon Mr Garg, As you: I am looking forward to meet you. Please have some patience and we meet. And undoubtedly there will be a very interesting
Posted - Thu May 10, 2012 9:51 am
 AWAP Bouman
awapbouman
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Re: decimal cube roots
Hi Jerry, Mutually!!!! Willem ... From: Gerald Newport To: MentalCalculation yahoolist Sent: Wednesday, May 09, 2012 6:42 PM Subject: RE: [Mental Calculation]
Posted - Thu May 10, 2012 9:43 am
 AWAP Bouman
awapbouman
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Re: decimal cube roots
Dear Mr. Bouman,         I am surprised that many calculation techniques particularly in factorisation can be developed without any empirical
Posted - Wed May 9, 2012 6:23 pm
 A Garg
amitkg78
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2012 23 2 15 29 64
2011 56 15 17 36 55 34 40 33 37 26 83 43
2010 43 33 53 62 18 64 126 61 40 80 173 63
2009 51 22 11 16 4 32 20 52 47 56 5 29
2008 46 78 31 28 13 45 66 4 37 16 55 24
2007 5 21 5 8 10 46 51 12 19 76 74
2006 23 45 7 19 13 2 7 16 14 27 7
2005 49 19 31 21 32 23 39 44 19 8 26
2004 68 23 69 48 33 9 3 39 24 10 94 67
2003 191 64 147 106 103 24 6 42 15 20 36 5
2002 81 147 190
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