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Posts

December 17, 2014

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3:00 PM | Garcia-Feuerbach Collinearity
Garcia-Feuerbach Collinearity
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2:21 PM | Make a Thermometer {Measurement Activity}
Buy this on Selz Selz powering ecommerce websites Students will use white paper to make a thermometer. Have them writer the numbers the same as they would see them on a real thermometer. Using red crayons, they will color the paper thermometer to the proper level to […] Related Math Games: How Cold is it? {Measurement Activity} Measurement Chain {Math Game} Cubes Investigation, Cubic Growth {Measurement Game}
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2:00 PM | Top Math Photos of 2014
Here are the most popular Math Photos from MrHonner.com for 2014.  Click here to see more. Escalating Ellipses Undersea Rose Curve Solids of Revolution Ten Pi Radians Manhole Math Art Non-Fibonacci Flooring  
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10:00 AM | Why $\log_{10} (2) \simeq 0.3$
“Coincidence?” said the Mathematical Ninja. “I think not!” He looked at his whiteboard pen as if wondering how best to fashion a weapon out of it. He wrote: $10^3 = 1,000$ $2^{10} = 1,024 = 1.024 \times 10^3$ So $10 \ln (2) = 3 \ln(10) + \ln(1.024)$ But $\ln(1.024) \simeq 0.024$ $10 \ln (2) \simeq 3 \ln(10) + 0.024$ – now divide by $\ln(10)$ to get everything in base 10: $10 \log_{10}(2) \simeq 3 + \frac{0.024}{\ln(10)}$ “Isn’t $\ln(10)$ about $2.3$?” asked the student, […]
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6:27 AM | Integrated Course Design for Euclidean Geometry (following Fink)
I recently learned of the work of L. Dee Fink on course design for college instruction. I am still amazed that (a) this hasn’t existed for a lot longer, and (b) no one had mentioned it to me before in its ten years of existence. Anyway, I have grabbed a copy of A Self-Directed Guide […]
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5:11 AM | EdTech Coaches ISTE Network: Amazing links & resources
I spent some time on the EdTech Coaches Network on ISTE.org and came across a plethora of great links and resources.  I could probably spend a few weeks sorting through all of these, so I'm organizing them here now in order to share with those interested (they are so great I didn't want to wait) and to make it easier for me to go back and read them in more detail later.If you are an ISTE member and haven't joined any of the Professional Learning Networks, here's how to do so:Log in […]
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5:01 AM | ISTE Coaching Academy Series - Course 3 Reflection
We're not talking about this Norms ;)https://c1.staticflickr.com/3/2657/3697676521_d9ba5db205_z.jpg?zz=1As I mentioned in a previous post (ISTE Course 1 Reflections; Course 2 Reflections), I am working through the ISTE Coaching Academy to continue in my professional growth.  I just finished working through the second course, entitled:"Coaching with a Norm for Effective Learning", focused on the ISTE Standards for Coaches 6.a-c, which state:NETS-C Standard 6: Content […]
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5:00 AM | And Equality for All
Like Roald Dahl and Catherine-Zeta Jones, the equals sign was born in Wales. Continue reading →
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4:09 AM | Mathematicians prove the Umbral Moonshine Conjecture
Source: Science Daily Mathematicians prove the Umbral Moonshine Conjecture Date: December 15, 2014 Source: Emory University Summary: Monstrous moonshine, a quirky pattern of the monster group in theoretical math, has a shadow — umbral moonshine. Mathematicians have now proved this … Continue reading →
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3:34 AM | This Week's Puzzle
No summary available for this post.
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2:08 AM | Cubes Investigation, Cubic Growth {Measurement Game}
Buy this on Selz Selz powering ecommerce websites Students will work in groups to find a solution to this problem: How many 1x1x1 cubes are painted on three faces, two faces, one face, or no faces when the following occurs? Different sized cubes are constructed from unit […] Related Math Games: Measurement Chain {Math Game} Inflatable Cube Math Game Meter Measurement Game
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2:00 AM | How To Write About Teaching... (Post 9 of 10)
...question mark? This is really an open question for me. I am far less confident about how to write about teaching than I am about how to teach.Here's what we know: teachers don't like educational research. @dandersod @mpershan @gwaddellnvhs I think most ed research is bogus. #thereisaidit— Amy Hogan (@alittlestats) December 16, 2014 @mpershan The research *feels* so fluid. Individual conclusions (seem) to change by the paper/researcher/decade. Know what I mean?— Dan Anderson (@dandersod) […]
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1:52 AM | Things Teenagers Say: Volume 24
So, I've decided that my motivation of late for blogging is pure procrastination.  At the moment, I'm procrastinating on cleaning my house by typing up this post.  The washer and dryer are both running at the moment, so this still counts as being totally productive, right? ;) Also - where has this semester gone?!?  Just a few more days until Christmas Break!  I don't know how I'm going to cope with not hearing crazy things come out of the mouths of teenagers for a couple of […]
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12:00 AM | On This Day in Math - December 17
Davy statue in PenzanceNothing tends so much to the advancement of knowledge as the application of a new instrument.~Sir Humphry DavyThe 351st day of the year; 351 is a triangular number, and the sum of five consecutive primes. It is also an element in the Padovan sequence, an interesting exploration for students.EVENTS1610 Father Christoph Clavius SJ, the senior mathematician at the Collegio Romano writes to inform Galileo that he and other Jesuits at the college had seen the four moons of […]

December 16, 2014

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11:28 PM | Math questions that make me groan
Not as often as you might think, but every now and then someone in our office asks me for help on a homework problem for one of their kids. Today I got asked to help out on this question:   In case the picture isn’t clear, you have an isosceles trapezoid with sides of length…
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9:44 PM | On A Rational Question - student
One of the limitations of Professor B------'s remarkable Experimental Clockwork Mathematical Apparatus is that the numbers upon which it works are but a subset of the decimal fractions. The scheme by which they are represented is extremely flexible and serves us well for most every kind of calculation, but my fellow students and I were curious as to just how badly they might let us down...
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9:17 PM | Algebra on a Chromebook: Coding with Bootstrap
Have you ever wanted to code in the classroom to integrate more STEM projects, but felt tied into making sure you hit all your required curriculum? Bootstrap (www.bootstrapworld.org) is a complete curricular resource for math teachers who want to integrate coding into their algebra instruction and computer science teachers who want to integrate and support their students' math learning.  
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8:29 PM | Specifications Grading, Revisited
The great specifications grading craze of 2014 continues, with Evelyn Lamb joining in and Robert Talbert going so far as to actually design a course using specs grading. I have now actually read the book, so all of my misunderstandings have been updated to ‘informed misunderstandings.’ The book contained a lot of useful references to […]
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7:58 PM | Class Opener – Day 71 – Factoring Drills
What’s the first rule of factoring? Don’t talk about factoring. It’s a shame that few students get my Fight Club references anymore, because they’re GOLD! I’m not sure there’s much in math class I look forward to less than factoring. … Continue reading →
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7:45 PM | Follow up...
I haven't heard back from my son's teacher (who I emailed over 2 days ago). I'm wondering if she'll just choose to ignore my email, which is not what I would advise as a teacher. Just three days left in their quarter!I'm considering holding back her Christmas present (a Tervis tumbler full of homemade caramel.... what a nice mom I am!).I was somewhat looking forward to a nice finish-up-December-easy week, but it wasn't meant to be. On Friday our Secondary Curriculum Director called and asked me […]
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6:22 PM | Photocopier survey
I'm preparing a new math-conference-speaker-session for 2015 and would love your input.This survey (found here) will take about 3-4 minutes and your input will prove extremely valuable with the direction I take in preparing my session. Thanks in advance for your participation.Loading...
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6:03 PM | تمرين 3 حول دراسة الدوال اللوغاريتمية وتمثيلها المبياني f(x)=x(ln(x)-1)²
تمرين 3 حول دراسة الدوال اللوغاريتمية وتمثيلها المبياني  f(x)=x(ln(x)-1)² اليكم في ما يلي تصحيح تمرين شامل حول دراسة دالة لوغاريتمية وتمثيلها المبياني مع شرح كل القواعد والخاصيات المستعملة. اسئلة التمرين  التصحيح مع الشرح <!-- mathsways336-280 --> (adsbygoogle = window.adsbygoogle || […]
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5:37 PM | How many points does a random curve over F_q have?
So asks a charming preprint by Achter, Erman, Kedlaya, Wood, and Zureick-Brown.  (2/5 Wisconsin, 1/5 ex-Wisconsin!)  The paper, I’m happy to say, is a result of discussions at an AIM workshop on arithmetic statistics I organized with Alina Bucur and Chantal David earlier this year. Here’s how they think of this.  By a random curve we […]
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4:20 PM | La triste storia di Ignaz Semmelweis
Ignaz Philipp Semmelweis, nato l'1 luglio del 1818, è stato un medico ungherese che ha portato a termine il primo studio epidemico della storia della medicina. Il suo problema fu l'ostracismo della comunità medica dell'epoca, che, ufficialmente, non gradì i suoi metodi poco rispettosi dell'autorità costituita. Semmelweis venne nominato assistente del professor Johann Klein nella Prima Clinica Ostetrica dell'Ospedale Generale di Vienna il 1° luglio, 1846. I suoi compiti erano di esaminare i […]
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3:01 PM | How Cold is it? {Measurement Activity}
Buy this on Selz Selz powering ecommerce websites Place a thermometer outside a window, or just outside a doorway that is close to your classroom. Each day, have a student check the temperature, after they understand how to read a thermometer.   To analyze temperatures, do the […] Related Math Games: Measurement Chain {Math Game} Food Labels {Mental Math Activity} What Measure Should I Use? {Mental Math Activity}
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2:42 PM | conference notes part 2: what we're not talking about in mathematics instruction
Cultural competence. I normally don't like separating this from the "content" or "instruction" that I wrote about yesterday, because I think doing so reinforces a false dichotomy or a tacit acceptance that it's okay to be good at one but not the other. However, I've also found that when I talk about the two together, sometimes people hear what they want to hear-- either just the content/instruction part or just the cultural competence/equity part. I'm making the choice here to extract the […]
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2:34 PM | Video Games & Making Math More Like Things Students Like
Here is the talk I gave at CMC-North last weekend: Video Games & Making Math More Like Things Students Like. Students generally prefer video games to our math classes and I wanted to know why. So I played a lot of video games and read a bit about video games and drew some conclusions. I […]
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2:18 PM | Measurement Chain {Math Game}
Buy this on Selz Selz powering ecommerce websites You will need to pair your students. Give each pair one sheet of construction paper, scissors and glue. Students work together to figure out how to use the sheet of construction paper to make the longest chain possible out […] Related Math Games: Meter Measurement Game Estimate ‘N Measure: Measurement Game Measurement War
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7:05 AM | What do Mathematicians Eat for Breakfast? (Surprising Answers!)
Are you curious what do Mathematicians eat for breakfast? :) Featured Book: The Math of Food (Integrating Math in the Real World Series) How can math help you improve your diet? Sharpens math skills from whole-number operations through basic algebra … Continue reading →
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6:46 AM | Trisecting an Angle (Possible?) [Very Interesting Videos]
In O Level E Maths, we learn how to bisect an angle using compass and straightedge (ruler). However, is it possible to trisect an angle? It turns out it is impossible! This took 2000 years to prove, and requires the use of … Continue reading →
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