在2016年杭州市小学数学课堂教学观摩评比活动中,余杭区戴光吕老师执教了人教版五年级下册“分数的意义”这节课,对这节耳熟能详的经典课的结构做了一些新的尝试和改变,引起了诸多与会者的思考。在小学数学教学中,分数的认识与运算是教师们比较喜欢选择的课题之一,这是因为分数是一个内涵丰富的概念,在数学发展史中具有重要的地位。它又是一个核心概念,与小学数学中的其他概念有着紧密的联系。 In 2016 Hangzhou primary school mathematics classroom teaching and evaluation activities, Yuhang District, Dai Guanglu teacher coached the fifth edition of the PEP “the meaning of the score” this lesson, the familiar structure of this section of the classic lesson to do Some new attempts and changes have aroused many attendees’ thinking. In primary school mathematics teaching, the recognition and operation of the scores are one of the topics teachers prefer to choose. This is because the score is a concept rich in connotation and plays an important role in the history of mathematics development. It is also a core concept that is closely linked to other concepts in elementary mathematics.