教学内容:北师大版教材一年级下册第三单元“生活中的数”中的“小小养殖场”(数的相对大小关系)。课前思考:这节课是在学生学习了100以内数的基础上进行教学的。教材首先借助“小小养殖场”的情境图,呈现了鸡、鸭、鹅的数量,使学生理解和感悟“多一些、少一些、多得多、少得多”这四个概念。然后通过一个猜数游戏,鼓励学生在猜一猜兔子只数的过程中,加深对这些概念的理解,既培养了学生的推理能力,又渗透了逼近的数学思想。最后通过选择的方式得到羊的只数,直观感受“差不多”的意义。教材借助三个问题帮助学生体会 Teaching content: Beijing Normal University version of the first grade textbook third unit “number of life ” in “little farm ” (the relative size of the number of relations). Pre-class thinking: This lesson is based on the number of students to learn 100 on the basis of teaching. The textbook first shows the number of chickens, ducks and geese with the help of the “Little Farm” situation map so that students can understand and appreciate the four “more, less, more, less” concept. Then, through a guessing game, students are encouraged to deepen their understanding of these concepts while guessing how many rabbits they are in. This not only cultivates students’ reasoning ability but also infiltrates the approaching mathematical ideas. Finally by the choice of the number of sheep to get the number of intuitive experience “almost ” meaning. Teaching materials help students to understand with three questions