tag:blogger.com,1999:blog-11439944.comments2018-03-14T18:38:29.405-07:00Grey Matters: BlogPi Guyhttp://www.blogger.com/profile/09760001560356969164noreply@blogger.comBlogger575125tag:blogger.com,1999:blog-11439944.post-87344821347853294702018-03-12T06:25:48.404-07:002018-03-12T06:25:48.404-07:00NO . Your method works . but saurabh's doesn&#...NO . Your method works . but saurabh's doesn't work. for example could you divide 21 by 22 with saurabh' method ? the answer is no. The checking process which you put into leapfrog IV is great ! it prevents from making mistake. could you please explain how to create such a checking process for numbers end in 4, 5, 6, 7 ?<br /><br />Could you please explain how you devised the leapfrogAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-86051828059225041902017-11-11T13:14:26.174-08:002017-11-11T13:14:26.174-08:00It�s difficult to find well-informed people about ...It�s difficult to find well-informed people about this subject, but you sound like you know what you�re talking about!<br />ThanksAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-15499242328479033202017-08-03T17:59:43.509-07:002017-08-03T17:59:43.509-07:00Nice review. Also remember if you're looking t...Nice review. Also remember if you're looking to get good at mental math, there's no substitute for practice. Math trainerhttps://www.mathtrainer.org/noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-29694098124702769652017-05-21T08:19:59.057-07:002017-05-21T08:19:59.057-07:00Thanks, everyone! I had to focus on schoolwork, wh...Thanks, everyone! I had to focus on schoolwork, which unfortunately didn't leave too much time for Grey Matters. Things have settled down now, so I figured it was time to bring it back.Pi Guyhttps://www.blogger.com/profile/09760001560356969164noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-46360172548830757532017-05-21T04:35:37.654-07:002017-05-21T04:35:37.654-07:00What Jay said! Dude, I had given up. On a whim, I ...What Jay said! Dude, I had given up. On a whim, I checked back. I'm excited to see you are back and doing well. I would love if you would email me personally or find me on Facebook. I was a bit concerned about you when you disappeared for so long.<br /><br />Thanks again and welcome back!Davehttps://www.blogger.com/profile/14677544105232890742noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-20876666977129000342017-04-13T13:10:40.408-07:002017-04-13T13:10:40.408-07:00Wow, I can't believe I missed the return of Gr...Wow, I can't believe I missed the return of Grey Matters. I've been checking on and off since you first stopped posting. Welcome back! Already digging the new posts.<br /><br />--JayJaynoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-54093190776348398562017-03-12T08:07:28.589-07:002017-03-12T08:07:28.589-07:00I think eta is really only useful when looking at ...I think eta is really only useful when looking at right angles and not any other angles. David Butler's video showed the importance of right angles, but it also showed how confusing eta would be to teach beginning students when his first definition of it was the ratio of paths argument, which is not only an extremely confusing definition, but it also doesn't even work. Eta is only the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-73290702502973611402017-03-12T07:56:45.582-07:002017-03-12T07:56:45.582-07:00To the first commenter here:
Saying "pi refle...To the first commenter here:<br />Saying "pi reflects the long history of mathematics" is an argument from tradition. You even mentioned that the only reason we used it was because of primitive measuring tools, which isn't a good reason at all. Should we still use degrees instead of radians and Roman numerals instead of base 10 just because they "reflect the long history of Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-74481566686503607432017-03-12T07:51:19.507-07:002017-03-12T07:51:19.507-07:00"Diameterans" don't work. All the th..."Diameterans" don't work. All the things like the derivative of sin being cos, the infinite series for sin, cos, and arctan, etc. only work with radians. The whole point of radians was to have a natural, elegant unit rather than an arbitrary one like degrees, but diameterans would be just as bad as degrees. That's basically the problem with pi; the Greeks didn't have radiansAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-77310487427217368202017-03-05T07:06:29.967-08:002017-03-05T07:06:29.967-08:00One religious press guy gave a speech
about a 2nd ...One religious press guy gave a speech<br />about a 2nd guy with his guns and a 3rd guy<br />in the army wanting shelter in their homes.<br />After 4 days they demanded a warrant and told<br />the guy 5 times they had nothing bad to say about<br />themselves. On the 6th day they were told they<br />would be brough to trail quickly, before 7 of their peers<br />and might get 8 days in jail which Robert Willisnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-80225495425885616252017-02-28T13:55:11.759-08:002017-02-28T13:55:11.759-08:00" Anonymous said...
The 823 year claim i..." Anonymous said...<br /><br /> The 823 year claim is when each of the 7 days in a week occurs exactly 4 times in February! 4 Mondays, 4 Tuesdays, 4 Wednesdays, 4 Thursdays, 4 Fridays, 4 Saturdays and 4 Sundays"<br /><br />Not originally. The earliest "823 year" forwards - dating back to 2009/2010 - claimed that a certain set of "three fives" in a month (usually 5Edwardhttps://www.blogger.com/profile/00483534642884838124noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-56867801029125051532017-01-29T09:22:40.861-08:002017-01-29T09:22:40.861-08:00Brilliant idea! I just performed ID for the first ...Brilliant idea! I just performed ID for the first time in about a year and they went ahead and named the King of Spades. I had to do a quick deck reversal when I realised I had it wrong! This will save me in the future.David Michaelhttps://www.blogger.com/profile/00460384667047078902noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-16141060258604339162016-08-01T07:15:55.926-07:002016-08-01T07:15:55.926-07:00In the extreme case, how would one encode a suit u...In the extreme case, how would one encode a suit using a flush of different suit? Curiositynoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-23785780497381427322016-05-10T21:51:46.266-07:002016-05-10T21:51:46.266-07:00There is another Site called :
Mnemonic Academy h...There is another Site called :<br /><br />Mnemonic Academy http://www.mnemonicacademy.com/Main Moderatorhttps://www.blogger.com/profile/18213166101499192326noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-12800373621261407862016-02-02T02:48:42.947-08:002016-02-02T02:48:42.947-08:00There are 5 Mondays in 2016 and if you check the y...There are 5 Mondays in 2016 and if you check the year 2044 it also has 5 Mondays. abeAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-84944087887125193732016-01-18T13:11:59.683-08:002016-01-18T13:11:59.683-08:00I thought this would be about the art of memorizin...I thought this would be about the art of memorizing/calculating powers of two.<br /><br />I feel anyone who needs to approximate 2^10 as 1000 for the purpose of computing 2^15 shouldn't be bothering learning tricks for mental calculation.<br /><br />I have all the powers of two memorized up to 2^64. And then the power of two powers of two memorized up to 2^2^10 or 2^1024 (unambiguously if youApt Patzerhttps://www.blogger.com/profile/07930466738091774112noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-27956917011356008992016-01-17T15:57:03.203-08:002016-01-17T15:57:03.203-08:00Thank you! These tricks really help!Thank you! These tricks really help!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-85157968044043398082016-01-08T14:11:00.576-08:002016-01-08T14:11:00.576-08:00Really useful information here, succinct and clear...Really useful information here, succinct and clear. We've linked to you from our most recent post on our maths education blog - http://mathsticks.com/my/2016/01/celebration-maths-challenge/Johduhttps://www.blogger.com/profile/01313489451922037571noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-30600070405989954252015-12-09T12:44:45.127-08:002015-12-09T12:44:45.127-08:00Awesome tutorial! I never thought I had the abili...Awesome tutorial! I never thought I had the ability to do anything close to this! Math is a lot of fun with the right teachers!Chris Brandonhttps://www.blogger.com/profile/09892716994286225027noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-9953669356580893852015-11-30T06:49:11.422-08:002015-11-30T06:49:11.422-08:00Just checked on Google about Akira Haraguchi. As o...Just checked on Google about Akira Haraguchi. As of March 13, 2015 he's memorized 117,000 digits of pi.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-79374463586140580522015-10-28T11:14:05.379-07:002015-10-28T11:14:05.379-07:00It's good to see you're back! I was gettin...It's good to see you're back! I was getting a little concerned. I have no way to contact you except this site or I would have tried. Just wanted to make sure you know that this website is great and would be greatly missed if it were to go away. Thanks again for all the work you do for our entertainment.Davehttps://www.blogger.com/profile/14677544105232890742noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-71223560124122517252015-10-24T13:17:05.044-07:002015-10-24T13:17:05.044-07:00I'm so happy this site is back. I check here v...I'm so happy this site is back. I check here very often to see if it has been updated and I am very happy to see that it was. It's funny because I have been playing with division lately using the techniques from the mental calculator's handbook and dead reckoning. I wasn't aware of this trick. I usually factor the denominator and then divide twice but this is better. Thank you Jaynoreply@blogger.comtag:blogger.com,1999:blog-11439944.post-48033802441687393652015-10-18T22:06:24.735-07:002015-10-18T22:06:24.735-07:00TORCH WAP JKLM
7T
1O
3R
3C
8H
1W
3A
1P
=37TORCH WAP JKLM<br />7T<br />1O<br />3R<br />3C<br />8H<br />1W<br />3A<br />1P<br />=37SHIVASHANKAR PRASADhttps://www.blogger.com/profile/14147622630461382501noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-8877552132644651612015-10-07T13:56:01.409-07:002015-10-07T13:56:01.409-07:00The EBCS is no longer available on iTunes. Do you...The EBCS is no longer available on iTunes. Do you know where we can find it now?Christianhttps://www.blogger.com/profile/15336003460125794267noreply@blogger.comtag:blogger.com,1999:blog-11439944.post-60640532768485022502015-09-16T00:06:42.451-07:002015-09-16T00:06:42.451-07:00Here is another method posted on Quora by Ori Eyal...Here is another method posted on Quora by Ori Eyal:<br /><br />Pre-arrange to number the cards from 1 to 52 according to suit and number. Then<br />four cards can be arranged to represent a number from 1 to 24. Now determine the<br />values for the five cards. If the highest card is less than 24 away from the<br />second-highest, use it as the secret card, otherwise use the lowest card as the<br Jannie Gerberhttps://www.blogger.com/profile/04375891252205269224noreply@blogger.com