Nowadays, mathematics has come to be increasingly put into practical use in various fields in society. However, Japanese students dislike mathematics. The purpose of this study is to consider the significance of teaching modelling. In this paper, I take up "Fuzzy modelling" as teaching material for senior high school students. As a result, it was found that students could catch the idea of "Fuzzy theory" naturally and could express models smoothly. Furthermore, they became aware of the pleasure of creating models freely, which had not been seen in traditional mathematics learning.