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August 2014, Volume 108, Issue 1


Who's in the Lead?
Alfinio Flores
The striking results of this coin-tossing simulation help students understand the law of large numbers.

Six Principles for Quantitative Reasoning and Modeling- FREE PREVIEW!
Eric Weber, Amy Ellis, Torrey Kulow, and Zekiye Ozgur
Modeling the motion of a speeding car or the growth of a Jactus plant, teachers can use six practical tips to help students develop quantitative reasoning.

A dynamic GeoGebra file

Triangles from Three Points
Wayne Nirode
Using technology to solve triangle construction problems, students apply their knowledge of points of concurrency, coordinate geometry, and transformational geometry.

A student solution using Geometer's Sketchpad
Wernick's table, updated (PDF)

Mission Impossible: How Do We Know?
Julia Viro
Proofs of impossibility—very important in the history of mathematics—can provide additional opportunities for the development of reasoning, as recommended by the Common Core State Standards.

Addressing the Standards for Mathematical Practice in a Calculus Class
Mary E. Pilgrim
A two-part calculus activity uses true-false questions and a descriptive outline designed to promote active learning.