FEATURES 
Math in the Box Mary DeYoung
Find out
how to make an origami paper box and explore the algebra, geometry, and other
mathematics that unfolds.
Podcast from NCTM's 2010 Annual Meeting in San Diego, California Learning Geometry from a Sheet of Paper
Presenters: Catherine Banks, Edith Hays

Cultivating an Area Model Erik Tillema A rich
understanding of multiplying binomials can be developed by working through a
series of concrete problems. 
Capitalizing on the Unexpected Susan Taber When
students use manipulatives, teachers can take advantage of their surprising
solutions to engage the class in rich and productive mathematical discussions. 
Building Numbers from Primes Jerry Burkhart Use
building blocks to create a visual model for prime factorizations. Students can
explore many concepts of number theory, including the relationship between
greatest common factors and least common multiples. 
A Worthwhile Task to Teach Slope Lauren Wagener Consider the possibilities
when teaching slope. It is a fundamental algebraic concept that has connections
to advanced mathematics and to the world outside the classroom. 