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         MATH TOOLS NEWSLETTER - APRIL 2, 2005 - No. 25

   Are you planning to visit Anaheim, California, to attend
   the National Council of Teachers of Mathematics 83nd Annual
   Meeting, April 6-9, 2005? If you are, we'd love to have
   you stop by Booth 448 in the exhibit hall, or attend one
   of our sessions focusing on Math Tools:

   Thursday, April 7, 3:00 - 4:30
   Session 355
   Desert Springs (Anaheim Marriott)
   Teachers of Teachers Workshop
   Math Forum @ Drexel tPoW: Using Technology to Help Students
     Solve Problems
   Presenters: Suzanne Alejandre & Cynthia Lanius

   Thursday, April 7, 3:00 - 4:30
   Session 372
   Room 213 C (Convention Center)
   Hands-On Computer Workshop (Mac)
   Sketchpad and More, Using the Math Tools Digital Library
   Presenter: Annie Fetter

   Technology PoW: Balloon Booths
   Scale the size of a hot air balloon so you can make it fit
   through a narrow passage and hit a nail to pop it.

   Technology PoW: Counterfeit Coins
   Find the fewest number of weighings that will identify which
   of the nine coins is counterfeit. A link to a Java applet
   from The National Library of Virtual Manipulatives (NLVM)
   is provided to help students think about the problem.

   Representation of concepts
   ycc states, "I am interested in the roles of different
   representations in understanding concepts of mathematics in
   particular, and any discipline in general."

   Tool: Wait for a Date
   Students use Sketchpad to simulate a probability problem and
   then calculate a precise probability by reasoning about their
   model. The link to the tool begins downloading the zip file, which contains both the sketch and a pdf file
   of the corresponding activity.

   Tool: Kali
   Jeff Weeks
   Kali lets you draw symmetrical patterns based on any of the
   17 tiling groups. Even the youngest children enjoy Kali. Older
   students can systematically explore the wallpaper, frieze and
   rosette groups. The command "Show Singularities" and the Conway
   and IUC notation provide support for a theoretical analysis.
   Freely available for both Windows and Macintosh computers.

   Tool: Poly
   Pedagoguery Software, Inc
   Poly is a shareware program for exploring and constructing
   polyhedra. With Poly, you can manipulate polyhedral solids on
   the computer in a variety of ways. Flattened versions (nets)
   of polyhedra may be printed and then cut out, folded, and taped,
   to produce three-dimensional models.

   Lesson Plan: Fibonacci-Like Sequences and the Golden Ratio
   In this activity, students develop the Fibonacci sequence and
   use a spreadsheet to investigate several of its interesting
   properties, drawing on a recursive formula to discuss arithmetic
   and geometric sequences, using exponential regression,
   calculating ratios, and exploring properties of Phi, the golden

   Support Material: Links to Data
   The Fathom Team at KCP Technologies
   Key Curriculum Press has organized an area with links to data
   sets for use with their Fathom software.

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              The Math Forum @ Drexel -- 2 April 2005