http://tech.groups.yahoo.com/group/MentalCalculation/ Mental Calculation Fri, 10 Jul 2009 14:31:28 GMT mariokliss3 http://tech.groups.yahoo.com/group/MentalCalculation/message/3064 http://tech.groups.yahoo.com/group/MentalCalculation/message/3064 Hi everyone! My question is it how it is able to raise two digit numbers as for example 37 to a power of 3-5? Are there any tricks or is there no general Mon, 06 Jul 2009 07:46:57 GMT A.W.A.P. Bouman http://tech.groups.yahoo.com/group/MentalCalculation/message/3063 http://tech.groups.yahoo.com/group/MentalCalculation/message/3063 Dear calculator friends, What do I see on internet about Mental Calculation and comparable activities? Heaps of longer and shorter videos which have without Thu, 02 Jul 2009 18:23:34 GMT A.W.A.P. Bouman http://tech.groups.yahoo.com/group/MentalCalculation/message/3062 http://tech.groups.yahoo.com/group/MentalCalculation/message/3062 Dear Calculationfriends, It is not the first time that I let know not to be amused when I see either videos or read articles in which some prodigees show Thu, 25 Jun 2009 18:03:13 GMT A.W.A.P. Bouman http://tech.groups.yahoo.com/group/MentalCalculation/message/3061 http://tech.groups.yahoo.com/group/MentalCalculation/message/3061 Hello good friend George, Magnificnent! Willem Bouman ... Van: george972453@... Aan: Mental Calculations Verzonden: maandag 22 juni 2009 20:25 Tue, 23 Jun 2009 12:48:50 GMT Prabhu Sutar http://tech.groups.yahoo.com/group/MentalCalculation/message/3060 http://tech.groups.yahoo.com/group/MentalCalculation/message/3060 Hello Maths lovers Free training in mental maths & abacus for teachers for details contact   ________________________________ From: ralf_laue Mon, 22 Jun 2009 21:04:57 GMT ralf_laue http://tech.groups.yahoo.com/group/MentalCalculation/message/3059 http://tech.groups.yahoo.com/group/MentalCalculation/message/3059 Thanks George, one of the best postings so far. Ralf Mon, 22 Jun 2009 18:35:41 GMT george972453@... http://tech.groups.yahoo.com/group/MentalCalculation/message/3058 http://tech.groups.yahoo.com/group/MentalCalculation/message/3058 Hi folks, I'm back - just like the proverbial bad penny. However, I hope I can be a bit more useful than a duff coin!   I've been working on a system for Sun, 21 Jun 2009 12:15:22 GMT George Lane http://tech.groups.yahoo.com/group/MentalCalculation/message/3057 http://tech.groups.yahoo.com/group/MentalCalculation/message/3057 WHOOOPS!! It seems only a part of my message got through to you the other day. Unfortunately, I have parted company with the original - please bear with me Fri, 19 Jun 2009 09:30:08 GMT george972453@... http://tech.groups.yahoo.com/group/MentalCalculation/message/3056 http://tech.groups.yahoo.com/group/MentalCalculation/message/3056 Hi folks, I'm back - just like the proverbial bad penny. However, I hope I can be a bit more useful than a duff coin!   I've been working on a system for Fri, 19 Jun 2009 08:07:40 GMT Andy Robertshaw http://tech.groups.yahoo.com/group/MentalCalculation/message/3055 http://tech.groups.yahoo.com/group/MentalCalculation/message/3055 Hi Mario! These are very tricky, but not impossible. Do you have a good mathematical knowledge? The Sines, Cosines and tangents of 0,30,45,60 and 90 are all Fri, 19 Jun 2009 08:06:33 GMT jsh.flynn http://tech.groups.yahoo.com/group/MentalCalculation/message/3054 http://tech.groups.yahoo.com/group/MentalCalculation/message/3054 Judging by your examples your arguments are in degrees in which case I would simply memorise the relevant tables up to all the functions you have mentioned are Thu, 18 Jun 2009 19:40:30 GMT mariokliss3 http://tech.groups.yahoo.com/group/MentalCalculation/message/3053 http://tech.groups.yahoo.com/group/MentalCalculation/message/3053 Dear calculator friends, My question is it, how I can work out trigonometric problems like sine, cosine and tangent(easily???) in my head. Are there any tricks Thu, 18 Jun 2009 09:29:32 GMT golipoor http://tech.groups.yahoo.com/group/MentalCalculation/message/3052 http://tech.groups.yahoo.com/group/MentalCalculation/message/3052 ... How fast can you do 8 digit and five digit multiplications,? How do you remember the cariies and how do you get them correctly if i get like 55 seconds on Wed, 17 Jun 2009 15:11:51 GMT George Lane http://tech.groups.yahoo.com/group/MentalCalculation/message/3051 http://tech.groups.yahoo.com/group/MentalCalculation/message/3051 Hi Willem, and all the rest of you too, of course.   The idea of the square root as I have used here was simply an illustration of the necessity of using Mon, 15 Jun 2009 14:21:47 GMT A.W.A.P. Bouman http://tech.groups.yahoo.com/group/MentalCalculation/message/3050 http://tech.groups.yahoo.com/group/MentalCalculation/message/3050 Good afternoon George, The morning gave me the possibility to think after your reaction, again thanks! I Think my problem lies somewhere else, square roots