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.
Podcast from NCTM's 2013 Annual Meeting in Denver, Colorado
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.