1. NRICH[br] https://nrich.maths.org/magiccrosses/[br]2. Numeracy CD[br] https://www.numeracycd.com/contents/activities/addition/magiccross/crosses.htm[br]3. 劉燕燕&石楓(1984)。《數學遊戲》, 頁2。內蒙古：人民出版社。(燕華老師提供)[br][br]Keywords: Magic Crosses, 十字型填數遊戲