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```   MATH TOOLS NEWSLETTER - JANUARY 2, 2009 - No. 71

Happy New Year! We are hoping that the new year brings many
interesting discussions to Math Tools. Feel free to start a
in progress.

***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/

http://mathforum.org/nsdl_mathtech/online/prob.html

The application deadline for our next sessions is
Monday, January 5.

The \$100 workshop fee is currently covered by a grant from
the National Science Foundation.

***FEATURED DISCUSSION
Introduce of Graphoon (web based drawing service)
Makoto wrote, "I developed web based drawing service, Graphoon.
You can draw line by formula (x^2, -2*x-3 ...) and some shapes
(triangle, circle...) on cartesian graph. Please input by way
of experiment as 'plot x.'"

***FEATURED DISCUSSION
New Online Stopwatch Tool
chronme announces, "Easy tool to record time spent on
each exercise..."

***FEATURED TOOL
Tool: Free Ride
http://mathforum.org/mathtools/tool/70643/
NCTM: Illuminations
This applet allows you to vary the gear ratio of a bike. The
distance traveled by a half-pedal is determined by the ratio
of gears. Can you capture all five flags on a course?

***FEATURED TOOL
Tool: Coin Toss
http://mathforum.org/mathtools/tool/70764/
Shodor: Project Interactivate
Simulation of a coin toss allowing the user to input the
number of flips, thereby exploring experimental and theoretical
probabilities. Toss results can be viewed as a list of
individual outcomes, ratios, or table.

***FEATURED TOOL
Tool: Single Fraction Pointer
http://mathforum.org/mathtools/tool/70750/
Shodor: Project Interactivate
Graphically determine the value of a given fraction
represented as a point on a number line. Graphically find
a fraction whose value is the given fraction using an arrow
on the number line as a guide. Single Fraction Pointer is
one of the Interactivate assessment explorers.

***FEATURED TOOL
Tool: Derivate
http://mathforum.org/mathtools/tool/70754/
Shodor: Project Interactivate
Begin understanding the meaning of the derivative at a point
on a function. View the graph and the equation of the line
tangent to any function at any point on the function.

***FEATURED TOOL
Tool: Algebra Four
http://mathforum.org/mathtools/tool/70753/
Shodor: Project Interactivate
Students play a generalized version of connect four, gaining
the chance to place a piece on the board by solving an
algebraic equation. Parameters: Level of difficulty of
equations to solve and type of problem. Algebra Four is
one of the Interactivate assessment games.

***FEATURED ACTIVITY
Activity: Converting between Fractions, Decimals, and Percents
http://mathforum.org/mathtools/activity/70638/
Victoria Miles
By sliding a lever, students can change the numerator and
denominator of a fraction. In the process, students will be
able to make connections between numerator or denominator
size and fraction size. Students will see instant equivalent
forms of a number, and will begin to see a relationship
between fractions, decimals and percents.

***FEATURED ACTIVITY
Activity: Exploring Tessellations
http://mathforum.org/mathtools/activity/70640/
Victoria Miles
Although it could be argued that the best way for students
to explore tessellations is by using pattern blocks, the
virtual pattern blocks in this NLVM applet will engage your
students, too. In this activity, students will understand
which shapes or combinations of shapes will tessellate,
and why.

CHECK OUT THE MATH TOOLS SITE:

Math Tools  http://mathforum.org/mathtools/
Register  http://mathforum.org/mathtools/register.html
Discussions  http://mathforum.org/mathtools/discuss.html
Research Area  http://mathforum.org/mathtools/research/
Developers Area  http://mathforum.org/mathtools/developers/