Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2014-10-23T01:07:55-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerMath teachers at play #79http://www.mathblogging.org/post/1021372014-10-22T17:15:00-04:00Maria MillerMath teachers at play #79 blog carnival is up!<br /><br />Go check it out. I found for example these interesting resources:<br />A variation of Sudoku puzzle plus a link to many more. Spider web math art - I want to do this one with my kids.<br />Pentaflake Chaoshttp://www.mathblogging.org/post/1021382014-10-22T16:55:12-04:00Scott SteketeeDan Anderson commented on my Pentaflake post to observe that the pentaflake can also be created by a random process, sometimes called the Chaos Game. In this game you start with an arbitrary point and dilate it toward a target point that’s randomly chosen from some set of points that you’ve established. You then dilate […]PhotoMath Apphttp://www.mathblogging.org/post/1021352014-10-22T16:41:02-04:00StaffThe PhotoMath App could revolutionize math for students struggling with the subject. Here’s how it works: open the app, take a picture of the math problem, and let the app work its magic. The app shows a step-by-step problem solving approach. Click here to check out the video and read more about MicroBLINK, PhotoMath’s parent...This Week's Puzzlehttp://www.mathblogging.org/post/1021362014-10-22T16:32:00-04:00Sian Zelbo<br /><br />Challenge Problemshttp://www.mathblogging.org/post/1021332014-10-22T16:15:13-04:00Mr. ChaseWant to enrich your Precalculus course with difficult problems? Look no further! I teach a high-octane version of Precalculus to students in our magnet program. Our course, like most Precalculus courses, covers a very wide variety of topics. As often … Continue reading →287 New groupshttp://www.mathblogging.org/post/1021322014-10-22T16:04:12-04:00andrescaicedoStarting Monday, you guys should be organized in new groups. No group can have three members that are together in the current groups. When I arrive on Monday, the groups should already be formed. You guys should start working on the laboratory on Polyhedra, Chapter 7. Make sure to bring whatever materials may be needed […]Evoahttp://www.mathblogging.org/post/1021342014-10-22T15:59:41-04:00Peter CameronA very different kind of excursion last Sunday, to Evoa, a nature reserve near the Tejo estuary. Quite a drive from Lisboa: along the highway to Vila Franca, and the iron bridge which was the last bridge across the Tejo … Continue reading →Happy Diwali 2014http://www.mathblogging.org/post/1021302014-10-22T15:30:00-04:00Gaurav TekriwalMay the Divine Light of Diwali shine with Peace, Prosperity, Happiness and Good Health in your life.<br />Happy Diwali 2014!<br /><br />The Vedic Math Forum India
Worlds Fastest Mental Math System
http://www.vedicmathsindia.orgMaking Mathematical Connectionshttp://www.mathblogging.org/post/1021282014-10-22T15:21:59-04:00mathmindsblogEach day I start the class with a Number Talk. I thought to continue building our multiplication strategies and make connections to our volume work, I would do Dot Quick Images. This is one of the images that I did yesterday: In this image I hoped to bring out the commutative and associative properties (not […]Class Opener – Day 34 – Dolphin Taleshttp://www.mathblogging.org/post/1021292014-10-22T14:59:33-04:00Bob LochelIt’s Wednesday, and that means it’s Student Choice for today’s opener. This week’s ideas comes from Katie, who loves dolphines. An article from Discovery claims that dolphins may be math geniuses, using the subtraction of echos from their built-in sonar … Continue reading →The 80-20 Rule Explained (Pareto Principle) [Video]http://www.mathblogging.org/post/1021272014-10-22T14:54:21-04:00Presh TalwalkarYou may know that about 80 percent of the world’s income is from the richest 20 percent, or that 80 percent of health care costs in America derive from 20 percent of the patients. But why does this happen? I have uploaded a new video that demonstrates the 80-20 rule in a simple experiment involving […]Cuckoo Filtershttp://www.mathblogging.org/post/1021252014-10-22T14:17:00-04:00Michael MitzenmacherAn upcoming paper appearing at CoNext will be of interest to any Bloom Filter user or aficionado:<br /><br />Cuckoo Filter: Practically Better than Bloom<br />(Bin Fan, David Andersen, Michael Kaminsky, Michael Mitzenmacher)<br /><br />Let me describe a cuckoo filter and some of what's in the paper for you. If you want to avoid a technical discussion, all you need to know is that for reasonably large sized sets, for the same false positive rate as a corresponding Bloom filter, cuckoo filters use less space than […]Funny Little Calculus Text by Robert W. Ghristhttp://www.mathblogging.org/post/1021242014-10-22T14:15:04-04:00UnknownBack by popular demand, we present to you Funny Little Calculus Text by Robert W. Ghrist. You can buy a copy of this in Google Play at https://play.google.com/store/books/details/Robert_W_Ghrist_FLCT_Funny_Little_Calculus_Text! [...]Centrifugal and Centripetal Forceshttp://www.mathblogging.org/post/1021262014-10-22T14:03:00-04:00Vlad AlexeevCentrifugal and Centripetal Forces
by Dywiann Xyara (Abstract-scientist)
http://im-possible.info/english/art/pencil/dywiann-xyara.html#centrifugal
Artist - http://abstract-scientist.deviantart.com/
Everything You Hate About Your Kid's 'New Math' May Be Wrong http://www.mathblogging.org/post/1021232014-10-22T13:20:44-04:00UnknownEverything You Hate About Your Kid's 'New Math' May Be Wrong : Linda Sharp:
I’ve been pretty vocal about my frustrations with my son’s math worksheets in recent years. Last year I wrote a post berating myself for not being able to understand his second-grade homework, what with the confusing blocks, lines, and swoopy curves he was using to figure out a subtraction problem that I’d been taught to solve via a comparatively simple (to my eyes, anyway) column. “Is this really intended to
[…]TPSE Math: The first stepshttp://www.mathblogging.org/post/1021192014-10-22T13:20:33-04:00UnknownA presentation by Mark Green at the AMS Committee on Education meeting, October 2014Longreads’ Best of WordPress, Vol. 7http://www.mathblogging.org/post/1021212014-10-22T13:08:09-04:00Mark Armstrong10 of our favorite stories from across all of WordPress."The Man vs. The Machine"http://www.mathblogging.org/post/1021222014-10-22T13:00:00-04:00"Shecky Riemann"<br />(via MichaelMaggs/Wikimedia)<br />Math fans usually like chess, so I'll refer readers to FiveThirtyEight's first mini-documentary film (17 mins.), on the historic 1997 match between then-World-Champion Garry Kasparov and IBM's "Deep Blue" (actually it's the RE-match that Kasparov LOST). Some interesting history... and following its victory and acclaim, Deep Blue "retired":<br /><br />http://fivethirtyeight.com/features/the-man-vs-the-machine-fivethirtyeight-films-signals/<br /><br />A Dose of Reality -- My Latest Common Core Ranthttp://www.mathblogging.org/post/1021162014-10-22T12:55:00-04:00Dave MarainI'm reproducing my comment to the post, "Who Needs Algebra?"on Mr. Honner's outstanding blog...<br> http://mrhonner.com/archives/14291#comment-10579.<br> I strongly recommend you read all of his excellent pieces. The current one is compelling for all math educators not to mention the public...<br> MY COMMENTS... First of all requiring an in-depth conceptual understanding of algebra for all students shows complete insensitivity to special needs students and their longsuffering
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[…]Understanding the anomalyhttp://www.mathblogging.org/post/1021202014-10-22T12:48:29-04:00dmoskovichI’ve recently been looking at the following paper in which -TQFT anomalies are treated carefully and various old constructions of Turaev and Walker are elucidated: Gilmer, P.M. and Masbaum, G., Maslov Index, Mapping Class Groups, and TQFT, Forum Math. 25 (2013), 1067-1106. It makes me think a lot about just what the anomaly `actually means’… […]Wallpaper for Mathematics Geeks (Part 1)http://www.mathblogging.org/post/1021152014-10-22T12:48:18-04:00UnknownNeed a new wallpaper for your computer? If so, why not make it "mathy" by using some of the ones provided below! To save a copy, click the image you want and select the Download! link. [...]The Art of Collaborationhttp://www.mathblogging.org/post/1021182014-10-22T12:38:00-04:00Joanne MorganThere's been a lot of talk lately about the power of collaboration. The best thing a teacher can do to improve their practice is learn from other teachers.
The main lesson coming from Shanghai is that their teachers get much more time to collaborate than we do. So, given that we spend the majority of our time (at work and at home) marking and planning lessons, how can we make time to learnMSR SVC Lettershttp://www.mathblogging.org/post/1021172014-10-22T12:34:35-04:00UnknownThe Committee for the Advancement of Theoretical Computer Science put together an open letter to several research leaders at Microsoft.<br />
We feel that there should have been a better way to close down this lab, one that would have allowed them to have continuous employment until academic jobs are available again in September 2015. Given that this lab was continuing to produce exceptional — indeed revolutionary — research, we fail to understand why closing it had to be done so suddenly.
I […]Stuck at 225http://www.mathblogging.org/post/1021142014-10-22T12:27:16-04:00tanyakhMy weight loss progress is progress no more. I am stuck at 225. I have my morning routine. I wake up and jog to the facilities; then I weigh myself. Why do I do this in this order? Because I do not use an alarm-clock. I depend on my own hydro-alarm that wakes me up […]Hurra! Oh weh! Die Schullandschaft.http://www.mathblogging.org/post/1021122014-10-22T12:25:07-04:00Jan-Martin KlingeWeil es immer weniger Kinder gibt, werden überall Schulen geschlossen. Das hat zur Folge, dass die Schulen um jeden Schüler kämpfen und auch bereitwilliger Schüler aufnehmen, als sie das vor zwanzig Jahren getan hätten. Und das hat zur Folge, dass speziell den Haupt- und Realschulen die Schüler davonlaufen. Sie werden … Continue reading → Wolfram Data Summit 2014http://www.mathblogging.org/post/1021132014-10-22T12:01:05-04:00Wolfram BlogThis year’s Wolfram Data Summit brought together innovators in data science, creators of connected devices, and leaders of major data repositories for two days of high-level discussion about challenges and opportunities facing the worldwide data community. This annual Summit offers an exclusive group of thought leaders an opportunity to meet and share insights into new [...]Exploring The Epic Chess Match Of Our Timehttp://www.mathblogging.org/post/1021082014-10-22T11:57:25-04:00UnknownExploring The Epic Chess Match Of Our Time: FiveThirtyEight:
FiveThirtyEight and ESPN Films follow the drama of those nine days in a short documentary film, “The Man vs. The Machine,” directed by Frank Marshall. The story — part of FiveThirtyEight’s new digital short series, “Signals” — hinges on a single move, the 44th move of the second game.
[source: mme rss]How to assess year 9http://www.mathblogging.org/post/1021092014-10-22T11:49:40-04:00srcavEarlier today I saw a tweet from Luke (@bettermaths) which said that the subject of those evenings #mathschat was “how should we assess year 9, in light of the new 1-9 grading system?” This got me thinking about year 9. It’s a funny year group in general. Traditionally it falls within key stage 3, but […]What percentage of numbers have a seven in?http://www.mathblogging.org/post/1021062014-10-22T11:46:18-04:00ColinSomeone on the internet asks: What percentage of the natural numbers have the digit ‘seven’ in them? This is going to sound like a weird answer: it’s 100%. I know, I know: you can point at 42 and 100 and 986,543,210 and 666,666,666,666,666 and at least a handful of others – so surely 100% can’t be right? (As an aside: you can reasonably say that there are as many ‘seven-free’ numbers as there are ‘sevenful’ ones as there are infinitely many
[…]An email I just sent to my depthttp://www.mathblogging.org/post/1021032014-10-22T11:38:37-04:00GlennI just sent this email to my department today. The subject was “If you still assign drill and kill problems”. I am posting the text of the email without comment. It was spurred by a conversation on Twitter with @DDmeyer and @JStevens009. Text is below: Good morning all, Hate to be the bearer of unwelcome […]