An Analysis of Teaching Areas of Triangles and Quadrilaterals in Elementary School Mathematics Textbooks

초등학교 수학 교과서에 나타난 삼각형과 사각형의 넓이 지도 방법에 대한 분석

The purpose of this study is to delve into how elementary mathematics textbooks deal with the areas of triangles and quadrilaterals from a viewpoint of the Didactic Transposition Theory. The following conclusion was derived about the teaching of the area concept: The area concept started to be taught perfectly in the 7th curricular textbook, and the focus of area teaching was placed on the area concept, since learners were gradually given opportunities to compare and measure areas. As to the area formulae of triangles and quadrilaterals, the following conclusions were made: First, the 1st curricular, the 2nd curricular and the 3rd curricular textbooks placed emphasis on transposition by textbooks, and the 4th curricular, the 5th curricular and the 6th curricular textbooks accentuated transposition by teachers. The 7th curricular textbooks put stress on knowledge construction by learners; Second, the focus of teaching shifted from a measurement of area to inducing learners to make area formula. Namely, the utilization of area formula itself was accentuated, while algorithm was emphasized in the past; Third, the way to encourage learners to produce area formula changed according to the curricula and in light of learners' level, but a wide range of teaching devices related to the area formulae were removed, which resulted in offering less learning chances to students; Fourth, what to teach about the areas of triangles and quadrilaterals was gradually polished up, and the 7th curricular textbooks removed one of the overlapped area formula of triangle.

제7차 수학과 교육과정의 6개 영역 중 측정 영역은 수학의 실용적 가치의 측면에서 강조되고 있다. 이 중 삼각형과 사각형의 넓이 지도는 통합적인 수학적 능력이 요구되고, 측정 영역의 후속 단계 학습의 기초가 되므로 중요한 교수학적 의미를 가진다. 따라서 본 연구에서는 우리나라 제1차 교육과정에서부터 제7차 교육과정에 따른 초등학교 수학 교과서에 나타난 삼각형과 사각형의 넓이 지도 방법을 (1) 넓이의 개념과 (2) 삼각형과 사각형의 넓이 공식으로 나누어 범주를 구성하고, 지도시기 및 지도 순서와 지도 방법을 교수학적 변환의 관점에서 분석하였다.