関連ワード:  what is case study in maths    what is case study in maths class 9    what is case study in maths class 8    what is case study in maths class 7    what is case study questions in maths    what is case based study in maths    what is case analysis in math    what is the meaning of case study in maths    what are case study questions in maths class 9    what is case study in mathematics