Foundational in understanding place value and our decimal number system, this concept is explored through a practiced-based activity designed to develop teachers' technology knowledge for teaching mathematics. The activity focuses on number sense using online applets and various related models and representations.

Contributor Notes

Jennifer Suh,, is an assistant professor of mathematics education at George Mason University (GMU) in Fairfax, Virginia. She is interested in developing teachers' mathematical knowledge for teaching through lesson study and professional development workshops.

Padmanabhan Seshaiyer,, is an associate professor of mathematical sciences at GMU. His work with K–grade 12 teachers focuses on deepening their mathematical content knowledge.

Edited by Spencer Jamieson,, a mathematics resource teacher for the Instructional Services Department of Fairfax County Public Schools (FCPS) in Virginia; Patricia W. Freeman,, who teaches algebra 1 and geometry to eighth graders at Franklin Middle School in Chantilly, Virginia, while pursuing a doctorate in Mathematics Education Leadership at GMU; and Courtney Baker,, who is a mathematics consultant for FCPS and a GMU doctoral student. Technology from the Classroom is the venue for sharing articles that illustrate the effective use of technology in pre-K–grade 6 mathematics classrooms. Send submissions of no more than 1500 words to this department by accessing See detailed submission guidelines for all departments at

(Corresponding author is Suh
(Corresponding author is Seshaiyer
(Corresponding author is Jamieson
(Corresponding author is Freeman
(Corresponding author is Baker
Teaching Children Mathematics
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