• Communications of Mathematical Education
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• v.24 no.3
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• pp.587-610
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• 2010

This paper investigates the ways for estimation ability improvement in length, which is recently emphasized in measurement area of mathematics education. According to preceding studies, students' length estimation ability is considerably low. Revision curriculum tried to pursue estimation and feeling of massiveness responsive to trends in mathematics education. But, Such efforts are not reflected in textbooks and they are rather weak in the aspect of estimation and feeling of massiveness. This paper analyzes the contents related to length estimation in current textbooks critically and explores an alternatives. This paper is suggestive for textbook development to improve ability to estimate length.