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    MATH TOOLS NEWSLETTER - NOVEMBER 13, 2009 - No. 81

 As you browse the catalog, please take a moment to rate a
 resource, comment on it, review it -- join an existing
 conversation, or start a new discussion!

 ***FEATURED TOOL
 Tool: Triangle Sort
 http://mathforum.org/mathtools/tool/88235/
 Crickweb.co.uk
 Learn about triangle properties before sorting them in
 different Venn diagrams.

 ***FEATURED TOOL
 Tool: The 4 Digit Sequencer
 http://mathforum.org/mathtools/tool/88187/
 Crickweb.co.uk
 Given a starting number and step size, this sequencer 
 challenges students to deduce the terms of a sequence 
 by viewing subsets of the pattern. The sequencer allows 
 for the input of four-digit and negative numbers.

 ***FEATURED TOOL
 Tool: Angles Formed by Parallel Lines and a Transversal
 http://mathforum.org/mathtools/tool/87964/
 Crickweb.co.uk
 This demonstration tool shows how to use a protractor, 
 and tests angle estimation skills.

 ***FEATURED TOOL
 Tool: Tomography Game	
 http://mathforum.org/mathtools/tool/87594/
 Humberto Bortolossi
 This game challenges you to identify a three-dimensional 
 object based only on its intersections with a plane. The 
 height of this plane can be changed using a slider control. 
 This simulation of a computerized tomography scanner makes 
 it fun to study cross-sections of 3D shapes.

 ***FEATURED TOOL
 Tool: The Double Operation Function Machine
 http://mathforum.org/mathtools/tool/87624/
 Crickweb.co.uk
 A function machine with two operations, and options to
 hide or reveal numbers and set all operations and numbers.
 A notepad is available for recording inputs and outputs,
 and a loop function takes the current output as the
 next input.

 ***FEATURED TOOL
 Tool: Hundred Square
 http://mathforum.org/mathtools/tool/87630/
 Crickweb.co.uk
 This versatile hundred square tool features three highlight 
 colors, variable starting numbers and steps, and options 
 to hide or reveal them.

 ***FEATURED TOOL
 Tool: Two-Digit Numbers
 http://mathforum.org/mathtools/tool/87668/
 Crickweb.co.uk
 Drag and drop the names of the two digit numbers on to the
 picture. The name box will turn green if correctly placed.

 ***FEATURED TOOL
 Tool: Symmetry Sort
 http://mathforum.org/mathtools/tool/88234/
 Crickweb.co.uk
 How many lines of symmetry does a square have? Find out this
 and more in this symmetry sorting activity. Available as a
 bounce back demo or without bounce back for assessment.


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    The Math Forum @ Drexel -- 13 November 2009