\input zb-basic \input zb-matheduc \iteman{ZMATH 2006a.00548} \itemau{Kim, Soo-Hwan} \itemti{A case study for developing the mathematical creativity in CNUE of Korea.} \itemso{J. Korean Soc. Math. Educ. Ser. D 9, No. 2, 175- 182 (2005).} \itemab This paper presents two activity cases for developing mathematical creativity at The Center for Science Gifted Education (CSGE) of Chongju National University of Education of Korea. One is 'the magic card mystery'; the other is 'mathematicians' efforts to solve equations'. (orig.) \itemrv{~} \itemcc{H13 D53} \itemut{mathematical creativity; magic card mystery; geometric puzzles; Cardano equation; problem solving} \itemli{} \end