Math

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  • Number-crunching could lead to unethical choices, says new study

    Mathematics News -- ScienceDaily
    15 Sep 2014 | 12:39 pm
    Calculating the pros and cons of a potential decision is a way of decision-making. But repeated engagement with numbers-focused calculations, especially those involving money, can have unintended negative consequences.
  • Story of Maryam Mirzakhani

    Homeschool Math Blog
    21 Aug 2014 | 12:01 pm
    I think some of you will enjoy reading the story of Maryam Mirzakhani, an iranian Mathematician, and a woman, who just recently won the most prestigious award in the world of mathematics: the Fields Medal. She is the first woman to win a Fields Medal!
  • simple sonobe

    mathrecreation
    Dan MacKinnon
    26 May 2014 | 7:01 pm
    I'm prepping for an origami workshop for middle school students, and am thinking about focusing on modular origami with sonobe units. In modular origami, many folded pieces of paper are assembled to make a model. Usually, all the pieces of paper (called units) are folded the same way. Like other forms of origami, modular origami is generally done without glue or scissors, so the pieces need to fit together so that they lock in place - putting the pieces together often feels like weaving or braiding. In past workshops for children at this age I have used a simple waterbomb octahedron (like…
  • Even and Odd Numbers – Basic, but Not Easy to Learn

    MathFour
    Bon
    2 Aug 2014 | 3:32 am
    You know about even and odd numbers, right? I was visiting with my sister yesterday and she was excited that her 8 year old son had finally grasped the idea. “I know, it’s a pretty basic concept, “ she told me, “but I’m just so excited he finally got it.” Which made me consider it. Are the concepts of even and odd basic? Basic but Not Easy Okay, yes. Even and odd numbers are considered a basic concept. Everyone over the age of 15 or so should have a general idea of which numbers are even and which numbers are odd. But even-ness and odd-ness are NOT easy concepts. Think about it:…
  • The New Way of Subtracting – Crushing a Facebook Meme

    MathFour
    Bon
    29 Jul 2014 | 1:48 pm
    “Oh – I see what they’re doing,” I thought to myself after spending 20 seconds looking at the latest bash-the-common-core meme: The “new way” is really the old fashioned way of giving change, before we had cash registers with computers in them. Getting change, the old fashioned way. I buy something and it costs $12. So I give you $32. (Because I’m a freak OR I anticipate not having so many $1’s in my pocket after this is over.) Your fancy-schmancy cash register computer is out (or doesn’t exist), so you need to give me change out of your…
 
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    Mathematics News -- ScienceDaily

  • Math model designed to replace invasive kidney biopsy for lupus patients

    17 Sep 2014 | 10:16 am
    Mathematics might be able to reduce the need for invasive biopsies in patients suffering kidney damage related to the autoimmune disease lupus. The model could also be used to monitor the effectiveness of experimental treatments for inflammation and fibrosis, researchers say.
  • Ebola outbreak 'out of all proportion' and severity cannot be predicted, expert says

    16 Sep 2014 | 9:29 am
    A mathematical model that replicates Ebola outbreaks can no longer be used to ascertain the eventual scale of the current epidemic, finds new research.
  • Number-crunching could lead to unethical choices, says new study

    15 Sep 2014 | 12:39 pm
    Calculating the pros and cons of a potential decision is a way of decision-making. But repeated engagement with numbers-focused calculations, especially those involving money, can have unintended negative consequences.
  • New math and quantum mechanics: Fluid mechanics suggests alternative to quantum orthodoxy

    12 Sep 2014 | 9:06 am
    The central mystery of quantum mechanics is that small chunks of matter sometimes seem to behave like particles, sometimes like waves. For most of the past century, the prevailing explanation of this conundrum has been what's called the "Copenhagen interpretation" -- which holds that, in some sense, a single particle really is a wave, smeared out across the universe, that collapses into a determinate location only when observed. But some founders of quantum physics -- notably Louis de Broglie -- championed an alternative interpretation, known as "pilot-wave theory," which posits that quantum…
  • Mechanical ventilation a key indicator for pre-term children's maths problems

    2 Sep 2014 | 6:29 am
    Both the length of time spent in hospital after birth and the use of mechanical ventilation are key indicators of reduced mathematical ability in preterm children, researchers report. Impairments in mathematic abilities are common in very preterm children. Earlier studies of children who are born very preterm (before 32 weeks of gestational age) have shown that they have a 39.4% chance of having general mathematic impairment, compared to 14.9% of those born at term (39 to 41 weeks).
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    Scientific American - Math

  • Symphony of Science Turns 5 Years Old Today!

    17 Sep 2014 | 7:28 pm
    Who doesn’t love the first, the original “Symphony of Science” tune, “Carl Sagan – ‘A Glorious Dawn’ ft Stephen Hawking”? -- Read more on ScientificAmerican.com
  • Prime Numbers Scholar Wins 2014 MacArthur "Genius Grant"

    17 Sep 2014 | 12:05 pm
    The award, which comes with a no-strings-attached $625,000 stipend paid out over five years, also went to black carbon and nano materials researchers -- Read more on ScientificAmerican.com
  • Quantum Short 2014 Film Contest Accepting Entries

    17 Sep 2014 | 8:35 am
    When the 2008 Bond film came out with the title Quantum of Solace, science fans may have been hoping for a plot that hinged on quantum physics. -- Read more on ScientificAmerican.com
  • Study of Eastern U.S. Shows Wind Energy Could Stabilize the Grid

    16 Sep 2014 | 10:17 am
    Last month, General Electric (GE) consulting presented the results of a U.S. National Renewable Energy Laboratory (NREL) sponsored study testing if wind turbines can be controlled to manage the... -- Read more on ScientificAmerican.com
  • Art and Science of the Moiré

    15 Sep 2014 | 1:40 pm
    I’m a bit obsessed with Scientific American covers, but my knowledge of the archive during the years before my time on staff is broad rather than deep. -- Read more on ScientificAmerican.com
 
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    Loren on the Art of MATLAB

  • Analyzing Uber Ride Sharing GPS Data

    Loren Shure
    6 Sep 2014 | 12:25 pm
    Many of us carry around smartphones that can track our GPS positions and that's an interesting source of data. How can we analyze GPS data in MATLAB?Today's guest blogger, Toshi Takeuchi, would like to share an analysis of a public GPS dataset from a popular ride sharing service Uber.ContentsIntroductionUber anonymized GPS logsDoes the usage change over time?Where do they go during the weekend?Visualizing the traffic patterns with GephiSummaryIntroductionUber is a ride sharing service that connects passengers with private drivers through a mobile app and takes care of payment. They are in…
  • Age is No Barrier to Exploring Ideas and Concepts in MATLAB and Simulink

    Loren Shure
    25 Aug 2014 | 11:24 am
    Age is No Barrier to Exploring Ideas and Concepts in MATLAB and SimulinkI’d like to introduce you to this week’s guest blogger, Graham Dudgeon. Graham is with our Industry Marketing Team at MathWorks, and focuses on the Utilities & Energy Industry. In this blog, Graham shares a story about age being no barrier to exploring ideas and concepts in MATLAB and Simulink.Hi Everyone, and thank you Loren for inviting me to be a guest blogger. This story begins with my dog, waiting patiently at the patio door expecting either of my two sons to let her in. She was out of luck. I am no…
  • Ever Needed to Move a Figure?

    Loren Shure
    11 Aug 2014 | 8:53 am
    Have you ever needed to move a figure? Perhaps because it is offscreen>? Or at least the menus or close box are not visible? This happens to me from time to time when I get code from someone else who is programming specifically to the size of their display. Working on a laptop, I often have fewer available pixels. What to do?ContentsHow to Find my Figure?Degrees of FreedomHave You Needed Help Locating Something?How to Find my Figure?I used the Function Browser to search for "move figure" and found movegui. It might be just the ticket for you.Degrees of FreedomAs you can see from the…
  • Write Once, Deploy Anywhere

    Loren Shure
    28 Jul 2014 | 8:03 am
    Guest blogger Peter Webb returns with another in an occasional series of postings about application deployment.ContentsDeployment TargetsDeploying to MATLABDeploying to the DesktopDeploying to a Java ApplicationReuse, Don't RewriteDeployment TargetsI've written a MATLAB application that reports on the presence of contaminants in surface water, using a publically available database of water quality observations maintained by the United States Geological Survey and the Environmental Protection Agency. Many groups of people might be interested in this kind of information. MATLAB made it easy to…
  • Analyzing Fitness Data from Wearable Devices in MATLAB

    Loren Shure
    14 Jul 2014 | 5:18 am
    Collecting and tracking health and fitness data with wearable devices is about to go mainstream as the smartphone giants like Apple, Google and Samsung jump into the fray. But if you collect data, what's the point if you don't analyze it?Today's guest blogger, Toshi Takeuchi, would like to share an analysis of a weight lifting dataset he found in a public repository.ContentsMotivation, dataset, and prediction accuracyData preprocessing and exploratory analysisPredictive Modeling with Random ForestPlot misclassification errors by number of treesVariable ImportanceEvaluate trade-off with ROC…
 
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    Homeschool Math Blog

  • Evaluation of a math assessment test - example

    15 Sep 2014 | 5:12 am
    You might already know that the placement tests on my site work equally well as generic math assessment tests.I also evaluate the test results for free. Now you can see an example of one student's test results and my evaluation here.Many students need to take two or even more tests in order to get a full picture of the gaps they have in their skills and knowledge. That was the case with this student also: she actually took three tests, grade 6, 5, and 4. I posted two of the tests and my evaluation at MathMammoth.com site. I hope it's helpful!
  • Number talks

    4 Sep 2014 | 2:39 pm
    Number talks are short discussions among a teacher and students about how to solve a particular mental math problem. The focus is not on the correct answer, but on all the possible methods of finding the answer.Each student has a chance to explain their method, and everyone else will learn from other people's methods!To start a number talk, the teacher gives the students a SHORT math problem to solve — but the students are not allowed to use a calculator or paper & pencil. The idea is to solve it in one's head! For example, you could ask students to solve 5 × 18 using mental math.Read…
  • Math Mammoth Grade 7-A is here!

    29 Aug 2014 | 2:46 pm
    I know it's Labor Day weekend, but... Math Mammoth Grade 7-A is here! Please note: Only part 7-A is available for now (as of August 2014). Part B is expected to be ready sometime in early 2015.Math Mammoth Grade 7-A is the first half of the pre-algebra curriculum from Math Mammoth. Part A worktext deals with:introduction to basic algebra conceptsintegers and their operationssolving one-step equations, including with negative numbersoperations with negative rational numberssolving linear equations and writing equations for word problemsgraphing linear equations and an introduction to the…
  • Story of Maryam Mirzakhani

    21 Aug 2014 | 12:01 pm
    I think some of you will enjoy reading the story of Maryam Mirzakhani, an iranian Mathematician, and a woman, who just recently won the most prestigious award in the world of mathematics: the Fields Medal. She is the first woman to win a Fields Medal!
  • Math Mammoth August sale!

    17 Aug 2014 | 11:20 am
    >Sale at Kagi!Get ALL downloads and CDs at Kagi store at 25%, 30% or even 35% off!Use coupon code MAMMOTH25 at Kagi store. Get 25% off when your order total is less than $50.Get 30% off when your order total is at least $50 but less than $80.Get 35% off when your order total is at least $80!The sale lasts till September 2, 2014. You will find links to order pages at Kagi all around MathMammoth.com site — they are located under each book's cover image. Or use these direct links to the order pages at Kagi:Order Light Blue seriesOrder Blue seriesOrder Golden and Green SeriesOrder Make It…
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    Let's Play Math!

  • Calling All Math Teacher Bloggers and Homeschoolers: Carnival Time!

    Denise Gaskins
    15 Sep 2014 | 3:01 pm
    by Bob Jagendorf via flickr The monthly Math Teachers at Play (MTaP) math education blog carnival is almost here. If you’ve written a blog post about math, we’d love to have you join us! Each of us can help others learn, so in a sense we are all teachers. Posts must be relevant to students or teachers of school-level mathematics (that is, anything from preschool up to first-year calculus). Old posts are welcome, as long as they haven’t been published in past editions of this carnival. Click here to submit your blog post. Browse all the past editions of the Math Teachers at Play…
  • Quotable: I Do Hate Sums

    Denise Gaskins
    29 Aug 2014 | 10:51 am
    I’ve been looking for quotes to put at the beginning of each chapter in my math games books. I found a delightful one by Mrs. LaTouche on the Mathematical Quotations Server, but when I looked up the original source, it was even better: I am nearly driven wild with the Dorcas accounts, and by Mrs. Wakefield’s orders they are to be done now. I do hate sums. There is no greater mistake than to call arithmetic an exact science. There are Permutations and Aberrations discernible to minds entirely noble like mine; subtle variations which ordinary accountants fail to discover; hidden…
  • Math Teachers at Play # 77 via Math = Love

    Denise Gaskins
    26 Aug 2014 | 3:10 pm
    Math Teachers at Play is a traveling collection of math tidbits — games, lesson ideas, and more — from around the Internet. It moves around from month to month, and the August edition is now posted at Math = Love blog. What a fun list of math posts to browse! Math Teachers At Play: Blog Carnival Edition # 77 Welcome to the 77th edition of the Math Teachers at Play Blog Carnival! I’m super excited to be hosting this carnival because I’ve been reading it for years! Yes, I am that crazy person who started reading math teacher blogs as a high school junior. I think you are…
  • Do You Blog About Math?

    Denise Gaskins
    18 Aug 2014 | 2:00 pm
    by Mike Licht, NotionsCapital.com It’s carnival time again. Activities, games, lessons, hands-on fun — if you’ve written a blog post about math, we’d love to have you join our Math Teachers at Play (MTaP) math education blog carnival. Posts must be relevant to students or teachers of school-level mathematics (that is, anything from preschool up through first-year calculus). Old posts are welcome, as long as they haven’t been published in past editions of this carnival. Click here to submit your blog post. Browse all the past editions of the Math Teachers at Play blog…
  • Fractions: 1/5 = 1/10 = 1/80 = 1?

    Denise Gaskins
    13 Aug 2014 | 5:23 am
    [Feature photo is a screen shot from the video "the sausages sharing episode," see below.] How in the world can 1/5 be the same as 1/10? Or 1/80 be the same as one whole thing? Such nonsense! No, not nonsense. This is real-world common sense from a couple of boys faced with a problem just inside the edge of their ability — a problem that stretches them, but that they successfully solve, with a bit of gentle help on vocabulary. Here’s the problem: How can you divide eight sausages evenly among five people? Think for a moment about how you (or your child) might solve this puzzle,…
 
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    Basic mathematics blog

  • Counting money worksheets

    25 Aug 2014 | 12:46 pm
    Counting money worksheets teachers print for free to help students in first grade count money
  • Counting worksheets

    25 Aug 2014 | 11:28 am
    Counting worksheets teachers can use for students in pre-school or first grade. Available to print for free. Help your students to count
  • Common mistakes in math

    19 Aug 2014 | 2:30 pm
    Some common mistakes in math and how to avoid them when doing your math problems
  • Volume of irregular shapes

    28 Jul 2014 | 1:28 pm
    Learn to calculate the volume of irregular shapes using commonly used volume formulas
  • Geometry word problems

    28 Jul 2014 | 5:40 am
    A collection of geometry word problems to help you practice a wide variety of concepts in geometry. All problems come with the solution
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    ChapterZero

  • Algebra: it matters

    swiftset
    15 Sep 2014 | 4:42 pm
    I’m looking at two different models for learning polynomial functions, and trying to determine if they are equivalent. After a couple days of thinking, I’ve reduced the question to the following: Can every symmetric polynomial of degree \(r\) in \(d\) variables that has no constant term be written as a sum of the \(r\)-th powers of linear polynomials in \(d\) degrees and a homogeneous polynomial of degree \(r\) each of whose monomials involves at most \(d-1\) variables?
  • Julia, once more

    swiftset
    9 Aug 2014 | 12:43 pm
    Julia + PyCall + CCall + Gadfly or PyPlot (+ Julia Studio ?) looks delicious. The only feature that absolutely needs to be added is shared memory parallelism (why wasn’t this an initial core feature of the language?), but I’m extremely excited by the current awesomeness of the Julia ecosystem. I recommend you get into it now, if you’re a scientific computation person. Update: Julia has experimental support for shared-memory arrays on Unix, which is really all that I need at this point. Great!
  • a bit on word embeddings

    swiftset
    25 Jul 2014 | 9:31 pm
    Lately I’ve been working almost exclusively on continuous word representations, with the goal of finding vectorial representations of words which expose semantic and/or syntactic relationships between words. As is typical for any interesting machine learning problem, there are a glut of clever models based on various assumptions (sparsity, hierarchical sparsity, low-rankedness, etc.) that yield respectable embeddings. Arguably, however, the most well known of these representations are the word2vec models due to Mikolov et al., which are part of a larger class of neural network-based…
  • Installing Hadoop on Ubuntu (works for Ubuntu 12.04 and Hadoop 2.4.1)

    swiftset
    18 Jul 2014 | 4:11 pm
    I’m trying to use LDA on a large amount of data. A quick recap: Tried vowpal wabbit … it’s fast, I’ll give it that, but it’s also useless: the output is dubious (what I think are the topics look like they haven’t changed very much from the prior) *and* I have no idea how it maps onto topics and documents (the documentation is AWFUL, and the dimensions of the output files are WONKY). Tried two implementations of SCVB0, a stochastic collapsed variational bayes LDA algorithm: one doesn’t work at all (as in, it stalls on any amount of data — so…
  • Sharing numpy arrays between processes using multiprocessing and ctypes

    swiftset
    1 May 2014 | 4:32 pm
    Because of its global interpreter lock, Python doesn’t support multithreading. To me, this is a ridiculous limitation that should be gotten rid of post-haste: a programming language is not modern unless it support multithreading. Python supports multiprocessing, but the straightforward manner of using multiprocessing requires you to pass data between processes using pickling/unpickling rather than sharing memory. Needless to say, this slows down execution when large amounts of data need to be shared by processes. In my case, I’ve been using multiprocessing to speed up the training…
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    Computational Complexity

  • Maryland Theory Day October 10!

    16 Sep 2014 | 9:48 pm
    Univ of Maryland at College Park is having a Theory Day Friday October 10. Free Registration and Free Lunch! (there are no economists coming to tell us there is no such thing). For Information and Registration goto here A good way to learn lots of current theory in a short time. Schedule: 8:30-9:00 Light Breakfast and Intro Remarks 9:00-9:20  Gasarch, UMCP NIM with Cash 9:25-9:45  Mount, UMCP A New Algorithm for Approximating the Euclidean Minimum Spanning Tree 9:50-10:10 Samir, UMCP: To do or not to do: scheduling to minimize energy 10:20-11:00 Coffee Break 11:00-12:00…
  • Richard Lipton Wins Knuth Prize

    15 Sep 2014 | 3:51 pm
    Georgia Tech professor and fellow blogger Richard Lipton will receive the 2014 Knuth Prize at the upcoming FOCS conference in Philadelphia. The Knuth Prize is given jointly by the ACM SIGACT and the IEEE TC-MFCS for major research accomplishments and contributions to the foundations of computer science over an extended period of time. Lipton's research has major results across a large spectrum of theoretical computer science from probabilistic algorithms to DNA computing to communication complexity. I'd like to highlight a couple of his papers in computational complexity…
  • Beyond the Commodity

    11 Sep 2014 | 3:44 pm
    Back in 2005 I lamented the fact that students viewed computers as a commodity, a tool they use, like an automobile, but have no reason to understand how or why it works. In 2011 I noticed a change, that computers like IBM's Watson were starting to make computer science cool again. Now we are in the midst of yet another major change, reflected in refound interest in high school computer science, and the huge enrollment growth in universities, particularly in non-majors taking upper-level CS courses. Jobs certainly drive much of this enrollment but for an important reason. Basic computer…
  • A Statistical oddity ?

    8 Sep 2014 | 9:09 pm
     I keep a list of people that are famous-to-me  that are old so that if someone dies I won't be surprised. When Lauren Bacall died  recently I  (1) knew who she was, AND (2) knew she wasn't  already dead. I DO NOT look at lists of celebs. My  list is organic- if I think of someone  who seems old (`GEE, I wonder if that famous probabilist Monty Hall is still alive? He is! He's 92.) I look it up and if they are over 80, they go on the list. Most people are surprised to know that Dorris Day is still alive. Okay, so what of it? Bill has  another weird…
  • Favorite Theorems: Quantum Interactive Proofs

    4 Sep 2014 | 4:10 am
    Practical quantum computing still has many hurdles to jump through, but the quantum computing model does generate great complexity questions and often surprising answers. QIP = PSPACE by Rahul Jain, Zhengfeng Ji, Sarvagya Upadhyay and John Watrous.  QIP is the quantum analogue of interactive proof systems. Since IP = PSPACE we get the consequence QIP = IP, that quantum doesn't give an advantage over classical randomness in the interactive proof model. I wouldn't read too much into that interpretation, more that we have a strange situation where IP is far more powerful than we…
 
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    Natural Blogarithms

  • The Importance of Your Worldview

    Scott Franklin
    2 Sep 2014 | 8:06 pm
    This week, I have the privilege and honor to lead the discussion in the Faith and Science course at Wayland.  The topic of discussion will be the importance of your worldview.  We start with a discussion on the 19th century masterpiece, “Flatland: A Romance of Many Dimensions” by Edwin A. Abbot. Then we’ll discuss a couple of readings: Are Scientists Biased by Their Worldview The Importance of Worldview Slides for guided discussion: This is an embedded Microsoft Office presentation, powered by Office Online.
  • 9 Essential Settings for the Teacher’s iPad

    Scott Franklin
    19 May 2014 | 8:20 pm
    When using your iPad to teach, particularly in the one-iPad classroom, you can run into a few frustrations with the technology. In spite of all the exciting new features you bring to the classroom with the iPad, there are also some headaches that come along with it. Here are some of the settings that our teachers have discovered and implemented to help to alleviate many of those frustrations. 1. Use Side Switch to Lock Rotation Tap the Settings icon on your home screen and go to the General tab. You can configure the side switch to either “Lock Rotation” or “Mute.” It…
  • 18 Basic Tips and Tricks for the Teacher’s iPad

    Scott Franklin
    14 May 2014 | 9:53 am
    The best thing you can do to familiarize yourself with the iPad is just to play with it.  You’ve got to be willing to explore by tapping, pinching, and swiping away.  One of the core design principles at Apple has been that their systems should be intuitive.  As you learn some of the basic interactions, you simply need to explore these common icons and gestures in different apps. Below are some the most basic tips and tricks that help teachers (and most general users, as well) to navigate their iPad. 1. Launching and closing apps When you are on the Home Screen, you can simply tap on an…
  • Teaching in the One iPad Classroom (Updated)

    Scott Franklin
    13 May 2014 | 2:38 pm
    This Friday, May 16, 2014, I will be conducting an all-day iPad workshop at the Education Service Center in Lubbock.  I’ve updated the handout that I use for these workshops so I’m posting it here for the participants to access. Everyone else is welcome to take and use the handout, as well. Teaching in the One iPad Classroom – Handout
  • Review Activity Ideas

    Scott Franklin
    29 Mar 2014 | 12:11 pm
    During the Teacher Quality Grant class today, we began preparing for the Post-Test that will take place in two weeks. Class participants shared a variety of ways that they conduct reviews in their junior high and high school classrooms. This group of teachers shares some very interesting games that they have used to engage students and get them more excited about math. Here are the ideas they shared: Jeopardy®: This is a classic game where students compete for points by selecting a category and point value. The question (or answer) is revealed and they are given the opportunity to buzz in…
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    WordPress Tag: Mathematics

  • Morning math frequent memories

    7handdr
    16 Sep 2014 | 4:55 am
    Every morning, i have to get up early at six in the morning and i have to go to school.Fun right? Waking up that early and going to school? Well i would disagree if it weren’t true.When i wake up and go to school my first class is Algebra 2, bright and early learning mathematical equations or just learning new things of the math subject. Normally i would feel tired and completely out of it since it’s so early,but this class makes me enjoy the morning a lot more than i usually am.My teacher is very optimistic and very chipper for it being almost eight in the morning! Well my point…
  • Dreams

    andyy1722
    16 Sep 2014 | 4:16 am
    We all need sometimes a break from reality, not because reality sucks, but because sometimes it is boring what is going around you, or because you just don’t want to be there at that moment and rather be somewhere else, like a dreamy land. There are two types of dreams: daydreaming and night dreaming. All these dreams are  expressions of our unconscious desires, just as Freud is saying is his well-known book “The Interpretation of Dreams” . Basically, dreams are our wishes, they show what we desire, but also dreams show our fears, that’s why nightmares are making…
  • Dalda Ka Dastarkhwan Magazine September 2014

    ebookspoint01
    16 Sep 2014 | 3:57 am
    Art Books, Biology, Fantasy Novels, free ebooks, free english books, Magazines, Mathematics, Psychology Books, Travel, Travel BooksDalda Ka Dastarkhwan Magazine September 2014 from Ebookspoint http://ift.tt/1qIvhH6 via IFTTT
  • Masalah Tv Food Magazine September 2014

    ebookspoint01
    16 Sep 2014 | 3:57 am
    Art Books, Biology, Fantasy Novels, free ebooks, free english books, Magazines, Mathematics, Psychology Books, Travel, Travel BooksMasalah Tv Food Magazine September 2014 from Ebookspoint http://ift.tt/1u0Ztel via IFTTT
  • Dosheeza Digest September 2014

    ebookspoint01
    16 Sep 2014 | 3:57 am
    Art Books, Biology, Fantasy Novels, free ebooks, free english books, Magazines, Mathematics, Psychology Books, Travel, Travel BooksDosheeza Digest September 2014 from Ebookspoint http://ift.tt/1qIvhqM via IFTTT
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    Mr. L's Math

  • Math and Teaching Quotations for Common Core-Part 7-Structure

    Bill Lombard
    5 Sep 2014 | 5:19 pm
    Math & Teaching Quotations has continued to be one of the most popular pages on my site, and it’s appropriate to revisit this as teachers transition to Common Core standards. Here’s the direct link to quotes on Mr. L’s site. A good quote can go a long way towards brightening my day as well as give students some brain food as they work through their daily tasks. Since the 8 Common Core Practices talk about “big ideas” and overarching goals, quotes fill this niche by allowing the discussion of wider goals – kind of like looking at the forest as opposed to looking at individual…
  • Math and Teaching Quotations for Common Core-Part 8-Patterns

    Bill Lombard
    5 Sep 2014 | 4:44 pm
    Math & Teaching Quotations has continued to be one of the most popular pages on my site, and it’s appropriate to revisit this as teachers transition to Common Core standards. Here’s the direct link to quotes on Mr. L’s site. A good quote can go a long way towards brightening my day as well as give students some brain food as they work through their daily tasks. Since the 8 Common Core Practices talk about “big ideas” and overarching goals, quotes fill this niche by allowing the discussion of wider goals – kind of like looking at the forest as opposed to looking at individual…
  • Math and Teaching Quotations for Common Core-Part 6-Precision

    Bill Lombard
    5 Sep 2014 | 3:37 pm
    Math & Teaching Quotations has continued to be one of the most popular pages on my site, and it’s appropriate to revisit this as teachers transition to Common Core standards. Here’s the direct link to quotes on Mr. L’s site. A good quote can go a long way towards brightening my day as well as give students some brain food as they work through their daily tasks. Since the 8 Common Core Practices talk about “big ideas” and overarching goals, quotes fill this niche by allowing the discussion of wider goals – kind of like looking at the forest as opposed to…
  • Math and Teaching Quotations for Common Core-Part 5-Strategy

    Bill Lombard
    5 Sep 2014 | 3:14 pm
    Math & Teaching Quotations has continued to be one of the most popular pages on my site, and it’s appropriate to revisit this as school resumes across the U.S. Here’s the direct link to quotes on Mr. L’s Math. A good quote can go a long way towards brightening my day as well as give students some brain food as they work through their daily tasks. Since the 8 Common Core Math Practices talk about “big ideas” and overarching goals, quotes fill this niche by allowing the discussion of wider goals – kind of like looking at the forest as opposed to looking…
  • Math and Teaching Quotations for Common Core-Part 4-Modeling

    Bill Lombard
    5 Sep 2014 | 2:59 pm
    Math & Teaching Quotations has continued to be one of the most popular pages on my site, and it’s appropriate to revisit this as school resumes across the U.S. Here’s the direct link to quotes on Mr. L’s Math. A good quote can go a long way towards brightening my day as well as give students some brain food as they work through their daily tasks. Since the 8 Common Core Math Practices talk about “big ideas” and overarching goals, quotes fill this niche by allowing the discussion of wider goals – kind of like looking at the forest as opposed to looking…
 
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    MathNotations

  • CCSS: One Less Than a Million - How Many Nines? Grade 2? 4? 6? 8?

    Dave Marain
    16 Sep 2014 | 4:01 am
    Implementing The Core - Raising The BarOne less than a million. How many 9's? Developmentally inappropriate for 7 year olds?***What questions should we be asking to develop this kind of arithmetic reasoning?******WHAT ARE THE BIG IDEAS HERE?***What should children be writing on their paper to make conjectures about numerical patterns?[1] less than 10: 9 [1 nine, 1 zero] [1] less than 100: 99 [2 nines, 2 zeros] etc...How can this be EXTENDED to challenge the child who's ready for higher-order thinking? Note that I didn't say *OLDER* children!EXTENSIONS/ASSESSMENT SUGGESTIONS One less than a…
  • Typical 2nd Gr Assessment Questions and Your Thoughts...

    Dave Marain
    15 Sep 2014 | 1:06 pm
    Imagine that. I'm not promoting my problems/solutions! As posted on my twitter account (twitter.com/dmarain) today... Here are a couple of typical questions your 2nd grade child/student may be working on... 1. (Clock shows 1:00) In 1/2 hour, it will be ___. Mathematical Practices Reflections... Why do you believe some children would struggle with this? Possible teacher/parent interventions? 2. Write arrow rule. Fill in missing frames.. 5---?---15---?---25---? Mathematical Practices Reflections... After child demonstrates proficiency, what can teacher/parent do to raise the bar? OR Are you…
  • Plugging in to avoid the algebra? Today's CCSS/SAT Twitter Problem

    Dave Marain
    15 Sep 2014 | 5:22 am
    1/|8x-4| > 1 Possible value for x? (SAT-type grid-in question) Strategies... "Plug in" - Easy? Graphing calculator? Algebra? How do you think I devised this problem? Want solution? Uh, you know what to do... VISIT ME DAILY ON TWITTER AT twitter.com/dmarain
  • More Solutions to Twitter CCSS/SAT Questions

    Dave Marain
    14 Sep 2014 | 8:51 am
    The following is part of what everyone on my Twitter Problems mailing list has been receiving every day or two for the past 3 weeks. For free... You have 2 weeks left to sign up. Free... As you can see I go beyond the answers. Way way beyond... Just as the Math Practices of CCSS suggest we do... 1. I walked my daily path 25% slower than usual and took 5 min longer. How  many min does it usually take? Answer:15 Solution: Let R=usual rate (mi/min); T=usual time (min) One can infer that distances are equal from the phrase "daily path". Using D=RT and equating: ((3/4)R)•(T+5)=R•T…
  • Sample Solutions to Recent Twitter CCSS/SAT Problems

    Dave Marain
    13 Sep 2014 | 12:26 pm
    The following is copied from solutions I sent today to my mail list of those who have opted for free solutions for the rest of September... Yes, I've been giving these away for weeks now. Hard to believe anyone would do this? There must be a catch, right? I will continue this until the 30th then am considering a low fee subscription for the rest of the school year. Subscribers will get detailed solutions which include strategies, big ideas, extensions, etc. Further I may include additional problems which will not appear on Twitter or this blog. To sign up, provide all pertinent info in…
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    mathrecreation

  • modular tables

    Dan MacKinnon
    17 Sep 2014 | 7:13 pm
    No, not a post about IKEA furniture. A while  ago I put up a post on colouring multiplication tables by assigning ranges of numbers a colour value. You end up with something that looks like a rainbow.This image was made in Tinkerplots, so it was easy to go from a 10 x 10 table to a 50 x 50 table (removing the numbers and just keeping the colours, and shrinking each cell down a bit):Inspired by the "Zn Multiplication visualizer" found here and mentioned here, and thinking about modular arithmetic from the last post, I decided to make a few more images.If you take the values in this…
  • squashing multiples

    Dan MacKinnon
    15 Sep 2014 | 7:21 pm
    An elementary school exercise leads to writing a simple program, a little proof by contradiction, and learning about some mostly-forgotten calculation tricks: just some of the fun that can be had when playing with simple math. Sound good? It all starts with squashing numbers...No doubt you've noticed some patterns in the non-zero multiples of 9: 9, 18, 27, 36, 45,... One thing to notice is that if you (repeatedly) add up all the digits of a multiple of 9, you always get 9 as your answer.This works immediately for many multiples of 9, like 9*14 = 126 (1 + 2 + 6 = 9), for others you need to…
  • parallel coordinates

    Dan MacKinnon
    20 Jun 2014 | 7:17 pm
    What's going on with these?Playing around with parallel coordinates.
  • origami workshop

    Dan MacKinnon
    28 May 2014 | 7:28 pm
    I mentioned in the previous post that I was considering doing some modular Sonobe origami in an upcoming workshop for middle school students. Wondering if this is a good idea, and thinking that I had better have some backup plans, I decided to make a list of origami models that I have used in school workshops in the past.Simple TrianglesThese simple models are nice for the very young and for beginners. Start with a triangle made from cutting standard origami paper along a diagonal.A bit of playing around with the triangles should be enough for you to figure out how to fold examples like the…
  • simple sonobe

    Dan MacKinnon
    26 May 2014 | 7:01 pm
    I'm prepping for an origami workshop for middle school students, and am thinking about focusing on modular origami with sonobe units. In modular origami, many folded pieces of paper are assembled to make a model. Usually, all the pieces of paper (called units) are folded the same way. Like other forms of origami, modular origami is generally done without glue or scissors, so the pieces need to fit together so that they lock in place - putting the pieces together often feels like weaving or braiding. In past workshops for children at this age I have used a simple waterbomb octahedron (like…
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    MathFour

  • Teaching Math to Special Needs Children

    Bon
    16 Sep 2014 | 7:38 pm
    I’m out of my depth. Like 3 bazillion leagues out of my depth. I took a math teaching position at a school for kids with neurological differences. I knew it would be hard. But I didn’t think it would be this hard. Lesson 1: Everything you know is wrong. It’s a Weird Al song, but it also applies to teaching kids with special needs. I gave this great math artwork activity that I thought would be perfect. My students are all 12-19 years old. They can communicate, be polite and follow instructions. And they are all listed as over 2nd grade in abilities. So this should have be a…
  • How Much Weight Does Wet Hair Add?

    Bon
    21 Aug 2014 | 3:47 am
    Have you heard that saying, “She weighs 115 pounds, soaking wet”? That saying hit me this morning while stepping out of the shower. I’m doing Weight Watchers and so I’m a bit hyper-focused on weight right now. So I thought I’d do an experiment. With math of course. Do I weigh more soaking wet? I weighed myself before I dried my hair. And then I weighed again, after it was dry. I didn’t do anything else – no consuming or, ahem, evacuating. I kept the same state of clothing. I didn’t move too much for fear I’d lose weight through energy.
  • All About the Benjamin – How Math Saves Lives

    Bon
    15 Aug 2014 | 8:51 am
    This is the story of how a 67% tip on a sushi bill saved a teenager’s life. Okay, that’s a bit of a hyperbole. But roll with me for a bit. The Back Story This summer I started teaching at a small school for kids with neurological differences 2.5 miles from my house. This was the perfect distance to start run commuting – running to work to get back into my old pre-kid running shape. During inservice for the fall, I attended a two day class on Reasoning Mind’s RMCity with a new colleague, Stephanie. Turns out Stephanie is pretty cool and she’s a runner. A twice…
  • Even and Odd Numbers – Basic, but Not Easy to Learn

    Bon
    2 Aug 2014 | 3:32 am
    You know about even and odd numbers, right? I was visiting with my sister yesterday and she was excited that her 8 year old son had finally grasped the idea. “I know, it’s a pretty basic concept, “ she told me, “but I’m just so excited he finally got it.” Which made me consider it. Are the concepts of even and odd basic? Basic but Not Easy Okay, yes. Even and odd numbers are considered a basic concept. Everyone over the age of 15 or so should have a general idea of which numbers are even and which numbers are odd. But even-ness and odd-ness are NOT easy concepts. Think about it:…
  • The New Way of Subtracting – Crushing a Facebook Meme

    Bon
    29 Jul 2014 | 1:48 pm
    “Oh – I see what they’re doing,” I thought to myself after spending 20 seconds looking at the latest bash-the-common-core meme: The “new way” is really the old fashioned way of giving change, before we had cash registers with computers in them. Getting change, the old fashioned way. I buy something and it costs $12. So I give you $32. (Because I’m a freak OR I anticipate not having so many $1’s in my pocket after this is over.) Your fancy-schmancy cash register computer is out (or doesn’t exist), so you need to give me change out of your…
 
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    CSE Blog - quant, math, computer science puzzles

  • "Flawless Harmony" Puzzle

    Pratik Poddar
    26 Aug 2014 | 2:40 am
    Source: AUSTMS Puzzle Corner 35 Problem: Call a nine-digit number flawless if it has all the digits from 1 to 9 in some order. An unordered pair of flawless numbers is called harmonious if they sum to 987654321. Note that (a, b) and (b, a) are considered to be the same unordered pair.Without resorting to an exhaustive search, prove that the number of harmonious pairs is odd.
  • Minimum sum of numbers in an array

    Pratik Poddar
    10 Aug 2014 | 10:21 pm
    Source: Asked to me on quora ( cseblog.quora.com ) Problem: Given an array of n positive numbers (n ~ 100000), what is the algorithmic approach to find the minimum possible sum (>=0) by using all the numbers in an array? Example 1: 1 2 2 3 4 Answer : 0 (-1+2-2-3+4) Example 2: 2 3 4 7 13 Answer: 1 (+2-3-4-7+13)
  • Caterer's Problem

    Pratik Poddar
    5 Aug 2014 | 10:07 pm
    Source: Puzzle Toad CMU Problem: You are organizing a conference, with a festive dinner on the first day. The catering service has 1024 different dinner choices they know how to make, out of which you need to choose 10 to be in the dinner menu (each participant will choose one of these during the dinner). You send an email to the 6875 participants of the conference, with the list of all 1024 choices, asking them to rank the choices in linear order from their favorite to their unfavorite. You want to find a list L of 10 choices, such that for any dinner choice d not in the list L, if we run a…
  • 3D Tic Tac Toe Puzzle

    Pratik Poddar
    10 Jul 2014 | 12:19 pm
    Source: Shared by Alok Mittal (Cannan Partners) Problem: A 3x3 tic tac toe has 8 "winning lines" (3 horizontal, 3 vertical and 2 diagonals). How many "winning lines" does the 3x3x3 3D tictactoe have? There is a brute force solution, and then there is the aha! solution.
  • Mad Robot Puzzle

    Pratik Poddar
    3 Jul 2014 | 8:16 am
    Source: http://nrich.maths.org/ Problem: A mad robot sets off towards the North East on a journey from the point (0,0) in a coordinate system. It travels in stages by moving forward and then rotating on the spot. It follows these pseudo-code instructions: SUB JOURNEY     DISTANCE = 1000     WHILE (DISTANCE > 0.001)         MOVE DISTANCE         STOP         ROTATE(90, DEGREES, CLOCKWISE)         DISTANCE = DISTANCE / 2     END WHILE     EXPLODE END SUB Where does the…
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