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http://dx.doi.org/10.7468/jksmee.2021.35.4.547

An Analysis of the Capacity Concept in Elementary School Mathematics: Focused on the Textbooks and Teacher Understanding  

Kim, Jeongwon (Sintanjin Elementary School)
Pang, JeongSuk (Korea National University of Education)
Publication Information
Communications of Mathematical Education / v.35, no.4, 2021 , pp. 547-573 More about this Journal
Abstract
Capacity is a concept that has been covered in elementary mathematics textbooks but its meaning has not been accurately defined in the textbooks. Two units, liter (L) and milliliter (mL), are introduced as the units of capacity in the textbooks, but they are the units of volume according to the International System of Unit. These stimulated us to analyze what capacity is, and how the capacity is related to the concept of volume. This study scrutinized how the different elementary mathematics textbooks that were developed from the first national curriculum to the most recently revised curriculum introduced the capacity and explained the relationship between capacity and volume. This study also examined the understanding of capacity by elementary school teachers using a questionnaire. The results of this study showed that the concept of capacity has been mostly introduced in the third grade in common but that there were differences among textbooks in terms of how they presented and used the concept of capacity as well as whether they described its definition or relationship with the concept of volume. Regarding the results of teachers' understanding, most teachers could explain the capacity as either "the size of the inner space of the container" or "the amount that can be contained" but some of them provided only superficial or inappropriate feedback for the students with the common misunderstandings of capacity. Based on these results, this paper presents implications for textbook developers and teachers to better address the concept of capacity.
Keywords
capacity; volume; elementary mathematics textbook; teacher understanding;
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