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November 2012, Volume 18, Issue 4

FEATURES

Produce Intrigue with Crypto!
Cheryl L. Avila and Enrique Ortiz

Introduce students to matrices while they encode, decode, and pass secret messages in math class.

more4u-MTMS-100x23 Podcast from NCTM's 2013 Annual Meeting in Denver, Colorado
 We’re Writing in Secret Code: I Think It’s Algebra
Presenter: Janie L. Zimmer


Get to Know a Circle- FREE PREVIEW!
LeAnn E. Neel-Romine, Sara Paul, and Kathryn G. Shafer
While working within the framework of van Hiele levels and handling Play-doh®, students write and critique definitions of a circle.

Sizing Up the Grinch’s Heart
Dana C. Cox and Michael Todd Edwards
How do middle school students interpret the phrase “two sizes too small”? Examining students’ responses will re-form your thinking about teaching similarity and using nonstandard shapes.

An Exce-L-ent Algorithm for Factors and Multiples
Jae Ki Lee, Kyong Mi Choi, and Melissa McAninch
The L-shaped 2-5-3-7 algorithm, combining efficient Singaporean and Korean procedures with divisibility rules of primes 2, 3, 5, and 7, helps students identify LCMs and GCFs.