You Find the Area? (2003)
Running time: 47 minutes
Description: A series of three lessons taught by
Dr. Akihiko Takahashi to fourth-graders in the San Mateo-Foster City
School District, California. The three lessons (abridged) provide hands-on
problem solving activities in which students extend their existing knowledge
and build a foundation for finding formulas for the area of a parallelogram,
a triangle, and a trapezoid. Using geoboards and the concept of equivalent-area-transformation
students begin to develop formulas for finding area.
About the Instructor: Akihiko Takahashi was an elementary
teacher in Japan for 19 years before becoming an educator of mathematics
teachers. During his elementary teaching career, he was nationally active
in mathematics lesson study and mentored 200 pre-service teachers. In
2002, he received his Ph.D. from the University of Illinois at Urbana-Champaign;
his dissertation research focused on internet use in mathematics education.
He is currently an assistant professor of mathematics education at DePaul
University in Chicago.
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