id: 06597590
dt: j
an: 2016d.00646
au: DeJarnette, Anna F.; Rosado Lausell, Sahid L.; González, Gloriana
ti: Shadow puppets. Exploring a context for similarity and dilations.
so: Math. Teach. (Reston) 109, No. 1, 20-27 (2015).
py: 2015
pu: National Council of Teachers of Mathematics (NCTM), Reston, VA
la: EN
cc: G40 E50 D80
ut: geometry; geometric concepts; similarity; activities; geometric reasoning;
sense making
ci:
li: http://www.nctm.org/Publications/Mathematics-Teacher/2015/Vol109/Issue1/Shadow-Puppets_-Exploring-a-Context-for-Similarity-and-Dilations/
ab: Summary: How can geometry teachers design great tasks that allow students
to make connections among interrelated concepts and expand their
geometric reasoning skills? Many curricular materials provide problems
for students to apply a single geometric concept. However, these
problems do not always promote reasoning opportunities for students,
because students may not look for connections with other geometric
ideas or explore alternative solution strategies. For classroom
teachers, this detachment raises an important question: What does it
take to transform a typical geometry exercise into a great task to
promote students’ geometric reasoning and sense making? the authors
use the term task to refer to a problem as well as students’
interpretation of what they should produce and students’ use of
resources and strategies to achieve that product. A great task begins
with a problem, but it also includes how the teacher launches the
problem and the work that students do to solve it. In this article, the
authors illustrate how they transformed a typical geometry problem into
a great task. (ERIC)
rv: