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.

Contributor Notes

Jae Ki Lee, jaelee@bmcc.cuny.edu, is an assistant professor at Borough of Manhattan Community College. Lee is interested in discovering alternative teaching and learning algorithms and teaching mathematics with technology.

Kyong Mi Choi, kyongmi-choi@uiowa.edu, is an assistant professor of mathematics education at the University of Iowa in Iowa City. Her research interests include mathematics curriculum analysis, international comparison studies, and mathematically gifted students.

Melissa McAninch, melissa.mcaninch@gmail.com, is a doctoral student in mathematics education at the University of Iowa, Iowa City. Her research interests include mathematics curriculum analysis and interventions in remedial mathematics.

(Corresponding author is Lee jaelee@bmcc.cuny.edu)
(Corresponding author is Choi kyongmi-choi@uiowa.edu)
(Corresponding author is McAninch melissa.mcaninch@gmail.com)
Mathematics Teaching in the Middle School
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