In This Issue
Help the Newsletter Reach a New Milestone
Hey Math!
Sage
Archimy.com  3D Graphs Online
Free Online Opportunities
For teachers of students in grades 35: Tools for Building Math Concepts
For teachers of students in grades 59: Using Technology and Problem Solving to Build Algebraic Reasoning
Apply now for the session starting January 14, 2008.
For all students: tPoWs
For students in grades 910: the MathMentor


Help the Newsletter Reach a New Milestone
Thanks to all of you who have referred a friend or colleague to subscribe to the Math Forum Internet News. Welcome to our newest subscribers!
As your forwarded messages make their way back to us newsletter editors, we've enjoyed reading over your shoulders. One math consultant, for example, recommended our mathforum.org website with this thoughtful note:
"For people in mathematics education, the website is a must to receive notice of what is going on in the area of mathematics. If you do not have an online subscription to their newsletter, now may be the time to think about getting you [sic] own subscription. (You cannot beat the price, it is free!)"
Now really *is* the time: we've decided to give a Math Forum prize to the referrer of the four thousandth subscriber.
So keep on forwarding and referring. For contest rules, please see last week's issue:
http://mathforum.org/electronic.newsletter/mf.intnews12.50.html
Hey Math!
http://www.heymath.com/main/productUS.jsp
Hey Math offers animated lessons on a wide range of topics, plus a repository of questions indexed by concept and grade. Started four years ago in Chennai, India, by Nirmala Sankaran and Harsh Rajan, Hey Math is a partnership with the Millennium Mathematics Project at Cambridge University. Many more lessons are available for purchase  and now, for the holidays, enter the code "SANTA" to get free renewals.
Select a country (United States, United Kingdom, Singapore, India), then browse these sample lessons:
 Introduction to Ratios
 Algebra Word Problems
 Introduction to Parallel Lines
 Capacity, US  Customary Units
 Introduction to Fractions
 Mean, Median, Mode
 Area of Compound Figures
 Pythagoras Theorem
 Introduction to Algebra
 Introduction to Quadratic Graphs
 Trigonometric Addition Formulae
 Congruence of Geometric Figures
 Relative Speed
 Perimeter of Simple Figures
 Volume of Pyramid
 Pie Chart
Sage
http://www.sagemath.org
Sage is a new open source mathematics program designed to do everything from map a 12dimensional object to calculate rainfall patterns under global warming. This free software, developed by William Stein, associate professor of mathematics at the University of Washington, reveals how it performs its calculations  so that other mathematicians can scrutinize the code.
Sage is freely available for download for Windows, Mac OS X, and Linux platforms.
Archimy.com  3D Graphs Online
http://www.archimy.com/
Denis Kozyr offers a service for drawing the graphs of all kinds of functions. Users can define a graph by specifying the formula for the coordinates x, y, and z.
Examples include:
 Sinus function
 Polar coordinates
 Function with tparameter
 Hyperbolic paraboloid
 Epicycloid
 Parametric function
 Spring
 Rotation through zaxis
 Spherical coordinates


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