华罗庚先生指出:“数缺形时少直观,形少数时难入微。”这句话形象地说明了数形结合的重要性。数形结合是小学数学中常用、重要的数学思想方法。许多数学问题、数量关系,借助于图形性质,可以使抽象概念和关系直观化、形象化。在教学中我们遇到过很多次教学中应用数形结合思想的案例。案例一 Mr. Hua Luogeng pointed out: “The number of lack of shape less intuitive, shaped when the minority difficult. ” This sentence vividly illustrates the importance of digital combination. Combination of numbers is a commonly used and important mathematical thinking method in elementary mathematics. Many mathematical problems, quantitative relations, with the help of graphical nature, can abstract and conceptualize abstract concepts and relationships. In teaching we have encountered a lot of teaching in the application of numerical combination of cases. Case number one