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All about ATMOPAV

One of the many hats I wear is that of second vice-president of ATMOPAV, the Association of Teachers of Mathematics of Philadelphia and Vicinity.  The organization hosts conferences in the fall and spring, provides awards and grants for classroom teachers, and publishes a newsletter 3 times a year.  Find out more about our organization on our website.

This past fall, we were all excited when the ATMOPAV newsletter was recognized by NCTM as best chapter newsletter, and our fantastic editor Lynn Hughes will accept recognition at the NCTM national conference in April.  And now, for the first time, our newsletter is available for pdf download.  The Winter, 2013 edition features:

  • “Graph Paper Racing” , “Electing the National Donut” and a review of Dragon Box, by Lynn Hughes
  • Pedagogical Ideas, Chapter 1 by Beth Benzing
  • “Fun and Engaging Bar Graphs” by Rich Murray
  • Technology Corner – thoughts on the TI-84 OS by Margaret Deckman
  • And, a guide for getting started on Twitter by yours truly!

Visit the ATMOPAV website, and click the Newsletter tab to download and enjoy our award-winning publication.

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A New Really, Really Big Prime Was Found! Woo Hoo!

On January 25, the largest prime to be discovered to date was “found”.  I use the word found in quotes, because the special number found was determined as part of the Great Internet Mersenne Prime Search (GIMPS).  Mersenne primes are prime numbers of the form:

where P is itself a prime number.  The  numbers 3, 7 and 31 are Mersenne Primes, corresponding to P’s of 2, 3 and 5.  In the GIMPS program, anyone with a computer can help search for new Mersenne primes by installing a program on their computer, which runs quietly in the background.  The recently found prime is the 48th Mersenne Prime to be found, and has over 17 million digits.  It’s not often that math is news, so this is a great opportunity to use something “ripped from the headlines”.

This is big, exciting news in the math community!  And the finding was heralded by an article on foxnews.com, which included the following passage:

Prime numbers, which are divisible only by themselves and one, have little mathematical importance. Yet the oddities have long fascinated amateur and professional mathematicians.

First, thanks to Fox News for pouring cold water on this big discovery.  Prime numbers are hardly oddities, and play a big role in much of the math we all do.  And, prime numbers, while often taught as a trivial notion, play a vital role in our national, world, and personal security.  In fact, the whole idea of RSA cryptography, that which keeps our data secure in thsi data-driven world, relies on prime numbers.  A quick search turned up some useful site which explain the role of the prime number.  Enjoy them, share the news with your students, and celebrate the discovery!

Prime Numbers and Cryptography – Clay Math Institute

RSA explained using paper and pencil

RSA numbers – from Wolfram Mathworld

RSA cryptosystem – prime glossary

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Worksheets and Differentiation – Not Always Mutually Exclusive!

I hate worksheets.

Is there anything worse than a math classroom where the pace and expectation are dictated by the almighty worksheet?  OK class, continue working on the blue worksheet, and homework will be on the pink worksheet.  Tomorrow, we will do test review with the aqua worksheet.  And then we will have a whole new chapter packet to work on….blah….

Don’t get me wrong…I’m not anti-practice.  Much of math is like learning to play the piano, you need to expend some sweat in order to master skills.  But, like playing the piano, all students will master the skills differently, with different timelines.  And, like piano players, some students will handle rigor and improvisation quicker than their peers.

So, how do we provide students with appropriate practice, while at the same time allowing students to have some say in their learning, assess their own progress, and provide for differentiation? Here are two strategies for you to try:

POINT-VALUE ASSIGNMENTS

In this strategy, students are not required to complete all assigned problems (unless they choose to). Instead, problems are assigned individual point values, and students complete enough problems to earn the assigned number of points. Easier problems have smaller point values, while more challenging ones are worth more.

Here’s an example, which use the Linear Functions Review given here (pdf): Linear Functions Review

This review has 18 problems, increasing in difficulty.  One way to assign point values would be:

  • Problems 1-7, 1 point each: these problems can be done mostly by looking at the linear pattern and providing a quick answer.
  • Problems 8-14, 2 points each: these problems mostly ask students to match function rule to situations.
  • Problems 15-18, 3 points each:  open-ended, and all require students to develop a function rule.

For this assignment, I would ask students to complete 12 points worth of problems.  This would require students to reflect upon their understanding, and provide differentiation.  How could students complete the assignment?

  • Students at a basic level could complete all 1-point problems, but would then also need to complete at least 3 of the 2-point problems (of their choice).
  • Students comfortable with the material could complete a mix of 1, 2 and perhaps 3-point problems.
  • Students at the advanced level could complete only all 4 of the 3-point problems.

The worksheet provided here was created uses the fantastic site Problem Attic, developed by EducAide software.  The site has a large bank of problems from various state, national and international assessments, and allows users to create their own customized assessments.  Definitely worth checking out!

CHOOSE-YOUR-OWN PATH

Many textbooks (particularly high-school texts) will arrange their problems sets into A, B and C levels.  Do I need to see students complete all problems from a set?  If a student demonstrates mastery of a C-level problem, do I really need to see them complete many A and B level problems?  This strategy allows students to choose the best path for completing an assignment, using this template:

Choose a Path

In this assignment, all students start with a B problem, then choose their own path for completing the assignment, by selecting one of 3 colored paths.   This could mean completing a few A problems, with a few B problems.  Other students many choose the series of B problems, with a few A’s sprinkled in.  Ambitious students may choose the challenging C problem to complete.

With both strategies, students are challenged to reflect upon their own learning, make appropriate choices, and take responsibility for their progress.  Classroom expectations don’t change at the drop of a hat, and may take a few conversations and failed attempts before working the way you like.  But they payoff, increasing student responsibility and reflection, are worth the pain.