<p>With the spread of the novel coronavirus disease， there is a need for mathematics education to deal with social issues that cannot be solved by scientific knowledge alone (trans-scientific issues).Therefore， this project focuses on socio-critical modeling， which aims to critically examine the role of mathematical modeling in students' daily and societal situations and the possibility of its implementation in mathematics classes. In critical mathematics education， which is the theoretical perspective of socio-critical modeling， both the everyday and the social are required simultaneously in the task context. However， it is difficult to create teaching materials for mathematics in children's daily and societal situations， which is neither only daily nor only societal. This project will examine this point from various perspectives such as a case study of students'research activity on the definition of recycling rate， risk communication， and socially open-ended problems.</p>