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MentalCalculation · Mental Calculation
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Group Information

  • Members: 867
  • Category: Mathematics
  • Founded: Oct 8, 2002
  • Language: English
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Activity within 7 days:

1 New Message

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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Unbelievable
Hi everyone, Around 2 minutes into this video you will see a young japanese man completing 30 rather difficult problems within a goal time of 3 minutes and 30
Posted - Thu Nov 26, 2009 1:41 pm
 JF
jsh.flynn
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(No subject)
Dear fellow calculators, om my website "willemboumanrekenen.nl" you ca find an article "modulo calculation" and an article "squares" in which I explain that
Posted - Mon Nov 16, 2009 2:46 pm
 A.W.A.P. Bouman
awapbouman
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Re: What you think?
Hello Ralf, That tool was very helpful at least for now. Thank You very much. Yusnier. ... -- Yusnier Viera cell: (786)712-4787 yusnierv@...
Posted - Mon Nov 2, 2009 2:36 pm
 Yusnier Viera
yusnierv@...
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Re: What you think?
Hello, As long as no new version is available, you can use the tool from <http://www.atnsoft.com/keyremapper/description.php> for changing the keys on your
Posted - Mon Nov 2, 2009 10:06 am
 ralf_laue
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new articles
Dear fellow calculators, on my website willemboumanrekenen.nl you can find 4 new articles - in (my) English, all concerning squares: a.. squares 1 b.. square
Posted - Mon Nov 2, 2009 9:52 am
 A.W.A.P. Bouman
awapbouman
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2009 51 22 11 16 4 32 20 52 47 56 5
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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