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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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