Posts
October 30, 2014
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7:00 AM  2430
2430 = 2 x 3 x 3 x 3 x 3 x 3 x 5.2430 is the number of unordered ways to write 1 as a sum of reciprocals of integers no larger than 18.2430 is 3300 in base 9.2430 is the sum of two powers of 3 (A055235).2430 is the product of all distinct numbers formed by permuting digits of 2430 (A061147).2430 is a number divisible by the square of the sum of its digits (A072081).2430 divides 9127  1.Source: What's Special About This Number
October 29, 2014
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11:14 PM  Scaling the Algebra Wall
Two of the barriers that students must overcome in the course of their math studies are fractions and algebra. Recently Heinemann published a textbook that makes it a lot easier for students to scale the algebra wall. The title is Transition to Algebra. It starts off in lesson 1 with exploring number tricks the kinds that I first learned about when I read W.W. Sawyer's Mathematician's Delight in 1972. A simple example is shown here in this video produced by Heinemann.
I highly recommend this […]
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3:47 PM  Why the world needs pi
If you had a sloppy maths teacher at school you might have grown up with the idea that the number is equal to Now that is completely wrong. Writing those numbers out in decimal gives while . There’s a difference in the third decimal place after the decimal point!
How accurately do we need to know the value of π?read more
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12:17 PM  The beginning of the end?
Is this beginning of the end of the traditional model of mathematics education? This advert for PhotoMath gone viral: and enjoys an enthusiastic welcome. Mathematical capabilities of PhotoMath, judging by the product website, are still relatively modest. However, if the … Continue reading →
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11:00 AM  October 29, 2014
Solution at the bottom of this page.Like this problem? Try our Contest Problem Book series!Exercise your mind daily with a problem from the AMC8, AMC10, or AMC12, provided by Mathematical Association of America's American Mathematics Competitions.
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9:39 AM  Halloween and October activities
How many houses can you get to – It’s Halloween. Time to trick or treat. How long will it take you to get to all of these houses? This is a very open ended task, counting, trick or treating strategies, distance and…Read more →
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6:30 AM  3564
3564 = 2 x 2 x 3 x 3 x 3 x 3 x 11.3564 is 11220000 in base 3.3564 is a concentric hendecagonal number (A195043).3564 is both an abundant number and a Smith number (A098835).3564 is a number n such that n together with its double and triple contain every digit (A120564).3564 divides 8918  1.3564 divides 11 + 22 + 33 + . . . + 35643564 (A135189).Source: What's Special About This Number
October 28, 2014
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6:40 PM  Top 5 Cities for New Engineering Jobs
Like almost everything else, engineering jobs took a hit in the recession, but they’ve been coming back strong. Earlier this year, a CTEq analysis of federal data showed that the unemployment rate for recent engineering graduates was a mere 2.2 percent from 2011 to 2014. Compare that to almost 7.0 percent for recent bachelor’s degree holders overall.
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On Wednesday, October 15, the University of Maryland Baltimore County SIAM Student Chapter hosted Conversations with Don Engel. We were fortunate to have a distinguished guest speaker, Dr. Don Engel, Assistant Vice President for Research at UMBC as well as an affiliate assistant professor of physics, computer science and electrical engineering. Dr. Engel has worked […]
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11:00 AM  October 28, 2014
Solution at the bottom of this page.Like this problem? Try our Contest Problem Book series!Exercise your mind daily with a problem from the AMC8, AMC10, or AMC12, provided by Mathematical Association of America's American Mathematics Competitions.
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7:00 AM  5675
5675 = 5 x 5 x 227.5675 is the number of monic polynomials of degree 13 with integer coefficients whose complex roots are all in the unit disk (A051894).5675 is 2777 in base 13.5675 is an alternating sum of decreasing powers (A083326).Source: What's Special About This Number
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6:00 AM  Partage d'un polygone
Les mathématiciens en résidence à la cité des géométries nous invitent à partager des polygones en parties d'aires égales d'un seul coup de ciseau, un beau sujet pour la classe ou la formation continue des enseignants.

Ressources pédagogiques : « pour aller moins loin »
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Piste bleue,
featured
October 27, 2014
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The Kansas City Royals and San Francisco Giants are engaged in a thrilling competition as the World Series heads into the home stretch this week. Savor the final innings even more by exploring the STEM connections to the game.Tags: science, technology
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1:08 PM  A Tribute to Kathryn Chaloner
The following was written by SAMSI director Richard Smith and former Deputy Director, Snehalata Huzurbazar. We were very saddened to learn of the death of Kathryn Chaloner on October 19. One of us (Richard) knew Kathryn for over forty years, … Continue reading →
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[We apologize if you receive multiple copies of this message.]This is a reminder that the paper submission deadline is November 10, 2014.CALL FOR PAPERSWe invite you to contribute to the special session of the Indiacom 2015 conference. Please, find the details below.Session Title:Wireless Sensor Networks for sustainable development>From low layer communications to Software Oriented ArchitectureSpecial Issue at IndiaCom 2015
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12:45 PM  Insightful mathematics for an optimal run
Mathematical equations can help improve athletic performance Sure, we can become better runners by hydrating well, eating right, cross training, and practice. But getting to an optimal running strategy with equations? That’s exactly what a pair of mathematicians from France propose in a paper published this month in the SIAM Journal on Applied Mathematics. “By […]
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10:14 AM  Pack it in
Clicking on any of these images will show them larger in a new window. Use your student’s Halloween enthusiasm to do a study on volumes. We’ve created an activity that asks students to calculate the volume of candy containers that…Read more →
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7:00 AM  3387
3387 = 3 x 1129.3387 is the largest of three consecutive semiprimes (A115393).3387 is the number of different keys with 7 cuts, depths between 1 and 7 and depth difference at most 1 between adjacent cut depths (A002714).3387 and 33387 end with the same two digits (A067749).3387 divides 318  1.Source: OEIS
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2:35 AM  CCC Call for Visioning Proposals
The Computing Community Consortium (CCC) invites proposals for visioning workshops that will catalyze and enable innovative research at the frontiers of computing. Successful activities will articulate new research visions, galvanize community interest in those visions, mobilize support for those visions from the computing research community, government leaders, and funding agencies, and encourage broader segments of […]
October 26, 2014
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10:22 PM  [DMANET] Welcome You to DIPDMWC2015, Dubai
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We apologize for multiples copies. Please circulate this CFP among your
colleagues and students.
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[DIPDMWC2015] The International Conference on Digital Information
Processing, Data Mining, and Wireless Communications
http://sdiwc.net/conferences/dipdmwc2015/
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The proposed
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6:00 AM  Premiers et derniers instants de Galois
Je me demande si la date de naissance d'Évariste Galois traditionnellement indiquée dans les dictionnaires et les encyclopédies est bien exacte…

Billets des habitués
October 25, 2014
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11:17 AM  Making a ghost costume
I’m going to make a costume pattern to sell. People can buy my plan and make awesome, long, full, scary, ghost costumes. This scheme will be so simple. Perhaps I’ll get rich! In this activity young students can reason about…Read more →
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5:00 AM  Maths au maquis
Cet automne 1943, les maquisards de la compagnie Bernard sont installés dans le massif de Belledonne. Une petite histoire de Résistance, de mathématique et d'enseignement.

Mathématiques ailleurs
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Piste verte,
featured
October 24, 2014
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(TenureTrack) Assistant Professor of Game Theory / Operations Research / Social Choice Theory
The Department of Quantitative Economics at Maastricht University School of Business and Economics (SBE) offers a tenure track assistant professorship in Game Theory / Operations Research / Social Choice Theory
Job description: The applicant will be appointed as a tenure track assistant professor and contribute to research and teaching within the overlapping areas of game theory, operations
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12:55 PM  Light weight
Peter Lynch
Does light have weight? Newton thought so. His laws predicted that gravity would bend of light, two centuries before Einstein's revolution.
Does light have weight? Newton thought so. He supported the corpuscular theory of light, regarding it as comprised of particles with small but finite mass. He concluded
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7:00 AM  5102
5102 = 2 x 2551.5102 is a semiprime whose digit sum is a perfect cube (A245021).5102 divides 516  1.5102 is 6888 in base 9 (A043487).Source: OEIS
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2:00 AM  Octobre, 4ème défi
Chaque semaine, un défi du calendrier mathématique 2014...

Défis du Calendrier Mathématique 2014
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Carrousel
October 23, 2014
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Daniel TaylorRodriguez is a new postdoctoral fellow at SAMSI and is participating in the Ecology program this year. He came from the University of Florida. His wife, Natalia, is still in Gainesville currently working on her Ph.D. in animal science. … Continue reading →