September 7, 2007
Volume 12 No. 36

In This Issue

Drawing a Crop Circle

Mr. Beneli's Website

Build It Bigger


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

For all students:

For students in grades 9-10:
the MathMentor


Drawing a Crop Circle

To draw a crop circle, the high school students at IES Ramon Cabanillas (Cambados, Pontevedra, Spain) calculated ellipses and discovered the pentagram's relation to the golden mean.

Sections of their website are:

  • All designs
  • The winning design
  • Previous practice
  • T-shirt
  • Who makes crop circles?
  • Original design on the field
  • Calculations

Spanish and Galician versions are also available.

Mr. Beneli's Website

Mr. Beneli offers a variety of Flash activities developed for his algebra students.

  • Modeling Addition
  • Integers
  • Fractions
  • Comparing Fractions
  • Percents
  • The Real Number Line
  • Plotting Points
  • Slope
  • Linear Equations in Slope-Intercept Form
  • Linear Inequalities
  • The Slope Game
  • Linear Equations and Their Graphs: Quiz Game
  • Function Machine
  • Probability
  • Triangle
  • Absolute Value
  • Absolute Value Puzzle (easy) (difficult)
  • Mastermind

Build It Bigger

Build It Bigger is a new television program on the Discovery Channel this season. Even if you are not viewing the program you might find the "Project Pages" interesting. They list numerical data on:

  • USS Donald Cook
  • Fenway Park
  • Coaster
  • Shanghai World Financial Center
  • M1 Abrams Tank
  • The City of Culture


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