December 21, 2007
Volume 12 No. 51

In This Issue

Help the Newsletter Reach a New Milestone

Hey Math!

Sage - 3D Graphs Online


Free Online

For teachers of students in grades 3-5:
Tools for Building Math Concepts

For teachers of students in grades 5-9:
Using Technology
and Problem Solving to Build Algebraic Reasoning

Apply now for the session starting January 14, 2008.

For all students:

For students in grades 9-10:
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 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:

Hey Math!

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 is a new open source mathematics program designed to do everything from map a 12-dimensional 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. - 3D Graphs Online

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 t-parameter
  • Hyperbolic paraboloid
  • Epicycloid
  • Parametric function
  • Spring
  • Rotation through z-axis
  • Spherical coordinates


This newsletter is provided as a service of The Math Forum, an online educational community for mathematics hosted by Drexel University, Philadelphia, PA.

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