子供の「割合」における概念獲得過程に関する研究(III) : 「2倍・1/2」を活用した類似探求授業の結果の分析と考察

概要

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In this research, I have two aims: (1) Clarifying the effectivity of "Double and Half' and the way to make use of it in lessons for "Ratio". (2) Designing lessons to promote comprehension for "Ratio", which make use of "Double and Half'. In view of two aims, I have carried out the experimental lessons, which intuitive recognition of "Double and Half" and "similarity" were considered. The subjects were the class A (35pupils) and the class B (34pupils), and were 5th grade of the elementary school in Kobe. In the lottery, the class A compared "lots : blanks = 3 : 2" with "lots : blanks = 2 : 1". And the class B compared "lots : blanks = 3 : 2" with "lots-blanks =2", also did "lots : blanks = 3 : 2" with "lots : blanks = 2 : 1". As results of analyses, I have clarified the following contents. (1) Presentation of "lots : blanks = 2 : 1" promoted comprehension for "Ratio". (2) Struggle for comparison of subtraction was effective in presenting "lots : blanks = 2 : 1". (3) The Inquiring Similarity Lesson was effective in promoting comprehension for "Ratio".
全国数学教育学会の論文
2007-00-00