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   MATH TOOLS NEWSLETTER - MARCH 6, 2009 - No. 73

***ONLINE PROFESSIONAL DEVELOPMENT WORKSHOPS (free)
For teachers of students in grades 5-9, we offer 
online workshops:

  Technology and Algebraic Reasoning
  http://mathforum.org/nsdl_mathtech/online/

  Tools for Thinking about Probability
  http://mathforum.org/nsdl_mathtech/online/prob.html

Applications will be open March 16 through April 13 
for the sessions scheduled to begin April 20. The 
$100 workshop fee is currently covered by a grant 
from the National Science Foundation. For a fee of 
$25 to cover administrative costs, 1.5 Continuing 
Education Units (15 contact hours) can be provided.

***ONLINE PROFESSIONAL DEVELOPMENT COURSES
Enroll in Math Forum online PD courses, fully moderated
by Math Forum staff. Registration is currently open for 
a variety of six-week courses scheduled for spring 
and summer:

    http://mathforum.org/pd/dates.html

All individuals who successfully complete the course will
receive a certificate indicating that they have completed
15 hours of professional development. This is equivalent
to 1.5 Continuing Education Units (CEUs). Current prices
for each course start at $149.

    http://mathforum.org/pd/

***FEATURED DISCUSSION
pantograph
http://mathforum.org/mathtools/discuss.html?&do=m&thread=___disc_894_g-1
ABlax wrote, "I need ideas for pantograph lessons. Any 
website links or suggestions would be greatly appreciated."

***FEATURED ACTIVITY
Activity: Ferris Wheel Noticing/Wondering Activity
http://mathforum.org/mathtools/activity/76481/
Lillian Ray
Students write what they notice and wonder about a 
person riding a Ferris wheel, and then use TI-Nspire(TM) 
technology to measure quantities and develop a 
mathematical model describing the situation.

***FEATURED ACTIVITY
Activity: MathThink - Activity Dice Difference Problem
Linda Fahlberg-Stojanovska
http://mathforum.org/mathtools/tool/74648/
This an applet for determining the expectation of 
winning if differences of 5, 4, 3, 2, and 1 are used to set 
up a dice game. For instance, if Player A has 1, 2, and 3 
as differences, does he have an advantage over Player B, 
who has differences of 4 and 5? And what is the ratio of 
the wins for Player A vs. the wins of Player B if
numerous rolls of the dice are used, say 60?

***FEATURED ACTIVITY
Activity: Area and Perimeter of a Trapezoid 
  (Coordinate Geometry) - Math Open Reference
http://mathforum.org/mathtools/activity/76478/
John Page
An interactive applet and associated web page showing 
how to find the area and perimeter of a trapezoid 
from the coordinates of its vertices. The trapezoid 
can be either parallel to the axes or rotated.

***FEATURED ACTIVITY
Activity: Definition and Properties of a Vertical Line 
  (Coordinate Geomtery) - Math Open Reference
http://mathforum.org/mathtools/activity/76437/
John Page
An interactive applet and associated web page that 
show the definition of a vertical line in coordinate 
geometry. The applet has two points that the user can 
drag which define a line.

***FEATURED TOOL
Tool: Equiangular Triangles - Math Open Reference
http://mathforum.org/mathtools/tool/76365/
John Page
An interactive applet and associated web page that 
demonstrate equiangular triangles (all interior angles 
congruent). The applet presents an equiangular triangle 
where the user can drag any vertex. As the vertex is 
dragged, the others move automatically to keep the triangle 
equiangular. The angles and side lengths are updated 
continuously to show that the all interior angles are 
always congruent.

***FEATURED TOOL
Tool: Savings Account
http://mathforum.org/mathtools/tool/74671/
Michael Backus
Students model a savings account and answer some 
thought-provoking questions. Addition and multiplication 
as well as a few spreadsheet concepts are all that is 
needed for students to use the model.

***FEATURED TOOL
Tool: Loan
http://mathforum.org/mathtools/tool/74672/
Michael Backus
Student model a loan they would like to take out. The 
only mathematical concepts required are addition and 
multiplication. Terminology and a few basic spreadsheet 
concepts need to be covered.

***FEATURED TOOL
Tool: Portable Media Players
http://mathforum.org/mathtools/tool/75656/
Michael Backus
Students investigate the costs and storage capabilities of 
portable media players (e.g., iPods).

***FEATURED TOOL
Tool: Paycheck
http://mathforum.org/mathtools/tool/75657/
Michael Backus
Students calculate net income and discover how much money 
they pay in taxes and for benefits in the process.


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      Research Area  http://mathforum.org/mathtools/research/
    Developers Area  http://mathforum.org/mathtools/developers/
 Newsletter Archive  http://mathforum.org/mathtools/newsletter/

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     The Math Forum @ Drexel -- 6 March 2009