ERIC Number: EJ1351785
Record Type: Journal
Publication Date: 2022-Sep
Pages: 8
Abstractor: ERIC
ISBN: N/A
ISSN: ISSN-0025-5769
EISSN: EISSN-2330-0582
Available Date: N/A
Understanding Similarity through Dilations of Nonstandard Shapes
Basu, Marina; Koellner, Karen; Jacobs, Jennifer K.; Seago, Nanette
Mathematics Teacher: Learning and Teaching PK-12, v115 n9 642-649 Sep 2022
This article discusses a set of tasks that introduce dilations using nonstandard figures, incorporating snippets of classroom conversations as students try to make sense of the specified tasks, to show how they progress in their understanding. The authors provide a theoretical foundation for the tasks and discuss the pedagogical implications for developing geometric proportional reasoning in students, where visual and spatial senses are invoked. The entire three-task set illustrates a learning trajectory that builds foundational understanding of similarity and congruence.
Descriptors: Mathematics Instruction, Teaching Methods, Geometric Concepts, Problem Solving, Thinking Skills, Spatial Ability, Transformations (Mathematics), Mathematical Logic
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191. Tel: 800-235-7566; Tel: 703-620-9840; Fax: 703-476-2570; e-mail: publicationsdept@nctm.org; Web site: https://pubs.nctm.org/
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: National Science Foundation (NSF)
Authoring Institution: N/A
Grant or Contract Numbers: 0732757; 1503399
Author Affiliations: N/A