• Journal of Educational Research in Mathematics
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• v.13 no.4
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• pp.447-462
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• 2003

The purpose of this study was to Investigate the preservice elementary teachers' pedagogical content knowledge of addition and subtraction. The subjects for data collection were 29 preservice elementary teachers and data were collected through open ended problems. The findings imply that the preservice elementary teachers show low level of understanding of addition and subtraction such as the word problem posing and the contexts of part-part-whole and compare. The research results indicate that the preservice elementary teachers possess primarily a procedural knowledge of pedagogical content knowledge and don't understand relationship with real-world situation. This study provide the information available on developing program for preservice elementary teachers.

• Journal of the Korean School Mathematics Society
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• v.8 no.3
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• pp.411-422
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• 2005

Along with the continual debate relating to the use of technology, especially since LOGO in 1980, technology has always been the issue to the society of mathematics education about what is the role of technology in teaching and learning, how it can facilitate for the better understanding of learners, especially what we can do more with it comparing to the traditional teaching and learning environments. Here I propose a way of using technology[GSP] for creative exploration, which makes it possible to extend our knowledge that leads to new discovery.

• Communications of Mathematical Education
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• v.29 no.4
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• pp.661-685
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• 2015

This study is to search for a program of professional development of mathematics teachers on the viewpoint of content knowledge of mathematics. To do this, we select algebraic subject as content knowledge for solution of polynomials and develop material for group study based on selected subject. We supply the developed material to teachers and discuss the possibility of application and the acceptability of it. For discussion, we collect data through tests and questionnaire. Through analysing the data, we obtain the positive result.

• Communications of Mathematical Education
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• v.11
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• pp.251-258
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• 2001

인간의 내면에서 일어나는 여러 가지 변화들을 인간의 지식으로써 표현하는 것이 여러 언어적인 표현이다. 그러나 인간이 무엇을 알고 있는가에 대하여, 표현하기란 그 누구도 결코 불가능한 것일 수도 있고 그렇지 않을 수도 있다. 그리고 인간의 지식을 표현하는 언어로서 자문자답한다고 하더라도 그 결과는 역시 알 수 없는 미궁으로 빠지게 됨을 그 누구나 공감하게 된다. 그렇다고 한다면 수를 보는 시각과 인류 문명에 대한 시각, 그리고 인간사고에 대해서도 이제 새롭게 볼 수 있는 시각이 요구되고 있다. 새로운 시각으로 수의 성질을 크게 존재 ${\cdot}$ 법칙 ${\cdot}$ 구조와 질서 ${\cdot}$ 힘 ${\cdot}$ 양과 질 ${\cdot}$ 통일로 분류하여 알아보았다. 다른 한편으로는 개인의 수 개념 형성에 초점을 둔 Piaget이론을 소개하고 있다 그리고 경험주의 선구자인 Dewey의 수 개념을 소개하고 있다. 역사와 수, 인체와 수에서는 동이와 수리사상이 인체와 관련된다는 사실은 동 ${\cdot}$ 서양을 막론하고 확인되고 있다. 인체와 수에 대한 것을 동양인 중국 문화권에서 일(一)부터 십(十)까지의 기호를 인체와 연결시켜 소개하였다. 수의 본질을 알고 이해하는 것이 곧 자연현상의 이해이며 그 자연의 일부인 인간을 이해하고 동시에 역사를 이해하는 기본이라 아니할 수 없을 것이다. 따라서 수를 보는 시각이 달라지지 않으면 수학을 기피하는 현상은 계속될 것이다.

• School Mathematics
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• v.8 no.3
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• pp.327-339
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• 2006

In this study, a teaching units for teaching and learning of secondary preservice teachers' mathematising is designed, focusing on reinvention of Bretschneider's formula. preservice teachers can obtain the following through this teaching units. First, preservice teachers can experience mathematising which invent a noumenon which organize a phenomenon, They can make an experience to invent Bretscheider's formula as if they invent mathematics really. Second, preservice teachers can understand one of the mechanisms of mathematics knowledge invention. As they reinvent Brahmagupta's formula and Bretschneider's formula, they understand a mechanism that new knowledge is invented Iron already known knowledge by analogy. Third, preservice teachers can understand connection between school mathematics and academic mathematics. They can understand how the school mathematics can connect academic mathematics, through the relation between the school mathematics like formulas for calculating areas of rectangle, square, rhombus, parallelogram, trapezoid and Heron's formula, and academic mathematics like Brahmagupta's formula and Bretschneider's formula.

• Communications of Mathematical Education
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• v.9
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• pp.63-72
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• 1999

수학의 가장 기본적인 요소인 수 개념과 감각의 형성과정에서 자리값에 대한 이해는 필수적이다. 또한 자리 값의 개념을 지도하기 위해서는 수와 연산지도가 통합되어야 하며, 논리적 사고력을 신장의 한 요소인 계산 알고리즘이 유의미한 학습되기 위해서는 자리값에 대한 이해가 바탕이 되어야 한다. 수에 대한 개념적 지식이 불충분한 상태에서 양을 수치화 하거나 지필 위주로 계산 알고리즘을 기계적으로 적용함으로 해서 발생하는 수와 연산학습의 결손을 줄이기 위해 본 연구에서는 수 개념과 감각을 기르기 위해 자리값 지도 방안에 대해서 알아보고자 한다.

• Journal of Educational Research in Mathematics
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• v.25 no.4
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• pp.617-630
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• 2015

A perspective of the nature of teacher knowledge has a significant impact on why and how we study teacher knowledge. The purpose of this study was to explore the mathematics knowledge in teaching (MKiT) in terms of meanings, characteristics, and analytic methods. MKiT regards teacher knowledge as practical knowledge that has meanings only when it is employed in teaching mathematics. Various components of teacher knowledge interact one another in teaching mathematics. Given this, teacher knowledge is regarded as an organism specific to teaching contexts and it needs to be analyzed by observing lessons or a teacher's actions related directly to the lessons. This paper is expected to induce research on teacher knowledge from the MKiT perspective and urge researchers to have a profound understanding of the nature and analytic methods of teacher knowledge. Some implications of future research are included.

• Education of Primary School Mathematics
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• v.17 no.3
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• pp.173-188
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• 2014

The aim of the case study presented in this paper was to explore mathematics curriculum knowledge of a South Korean elementary teacher. An in-depth case study is applied to examine mathematics curriculum knowledge that influences teachers' instructional process including analysis of diverse artifacts such as lesson plan, observation and interviews. Findings of this study suggest that mathematics curriculum knowledge has direct relevance to teaching a lesson, designing a lesson and assessing students' work. In addition, this study identified that mathematics curriculum knowledge may be divided into two sub-categories: vertical mathematics curriculum knowledge and horizontal mathematics curriculum knowledge. The results of this case study help our understanding of South Korean elementary teachers' mathematics curriculum knowledge, which has a deep impact on their teaching practice. Moreover, this cross-national research offers implications for researchers, policymakers, and teachers in U.S. as well as those in South Korea.

• Journal of Educational Research in Mathematics
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• v.17 no.4
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• pp.437-452
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• 2007

Complementarity, complementary principle and complementary approach have been often used in school mathematics but its meaning has not been obvious. Thus this paper tries to make explicit the meaning by looking around complementary characteristic of mathematical knowledge. First of all, we examines the general meaning of complementarity and Investigate complementary characteristics of mathematical concepts through incommensurability and zeno's paradox. From this, complementary approach to school mathematics is studied. To understand and uncover complementary characteristics of mathematical concepts make it possible for student to have an insight. It is the most important thing that students can have an image of mathematics as a living system rather than as a mechanical application of rules and fragmentary in formations.

• Journal of Educational Research in Mathematics
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• v.22 no.2
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• pp.163-178
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• 2012

The efforts to represent the numbers based on the decimal system give us fundamental understanding to construct and teach the concept network on the related knowledge of elementary and secondary school mathematics. In the process to represent natural numbers, integers, rational numbers, real numbers as decimal system, we will classify the extended decimal system. Moreover we will obtain the view to classify real numbers. In this paper, we will study the didactical significance of mathematical knowledge, which arise from process to represent real numbers as decimal system, starting from decimal system representation of natural numbers, and provide the theoretical base about the classification of real numbers. This study help math teachers to understand school mathematics in critical inside-measurement and provide the theore tical background of related knowledge. Furthermore, this study provide a clue to construct coherent curriculum and internal connections of related mathematical knowledge.