一、教材简析在学习了分数的初步认识之后,在结合学生对小数学习的基础上,教材引入了正数和负数的概念。学生凭借对客观世界的认识理解了负数的广泛运用。教材在对概念呈现时注重对学生已有经验的唤醒,从学生生活的情境入手,在具体直观的环境氛围中让学生接触负数,便于学生的理解和记忆。本次教学设计主要是想通过温度和海拔高度的变化,并结合学生的实际引入负数的概念,使学生学会负数的表示方法,并且会读会写。二、设计理念本节课以教学负数的概念为主,秉承学生的认知理念出发,从负数的概念来源和意义的角度让学生接受并理解负数的概念。再进行比 First, the textbook analysis After learning the initial understanding of the score, combined with the students on the basis of fractional learning, the textbook introduces the concept of positive and negative numbers. By understanding the objective world, students understand the widespread use of negative numbers. The textbook emphasizes the awakening of the students’ experience when presenting the concept. Starting from the situation of students’ life, the textbook exposes students to negative numbers in a concrete and intuitive environment to facilitate students’ understanding and memory. The teaching design is mainly through the temperature and altitude changes, combined with the actual introduction of the concept of negative numbers, so that students learn how to say negative, and will read and write. Second, the design concept This lesson to the concept of negative teaching, adhering to the cognitive concept of students starting from the concept of negative source and meaning of the concept of point to allow students to accept and understand the concept of negative numbers. Again than the ratio