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December 2002, Volume 8, Issue 4

FEATURES

What Happens to Geometry on a Sphere?
Janet M. Sharp and Corrine Heimer
A series of lessons used to study basic ideas from spherical geometry.

Build Your Own Fraction Computer!
Peter L. Glidden
Article describes the construction and use of the "fraction computer,"  a simple manipulative that helps pupils understand how to add and subtract fractions.

Three-Dimensional Geometry and Crystallography
LaDawn Haws
An activity involving multilink blocks that helps students develop three-dimensional spatial skills. The activity is motivated by the work of Nobel Prize winner Dorothy Crowfoot Hodgkin.