论文部分内容阅读
一、观察操作,感知表面积的意义长方体表面积的意义是探索长方体表面积计算方法的基础,教学时要有意地把培养学生的空间观念和形成表面积的概念联系起来,使表面积的概念在学生头脑中真正形成表象,既有利于学生探索计算表面积的方法,又给灵活运用计算方法解决实际间题奠定好基础。教学时,首先通过对长方体特征的复习再现,然后利用模型让学生触摸感知长方体的表面积是指上下、前后,左右六个面,再将六个面展开,让学生直观地认识长方体表面,在空间知觉的基础上引导学生认识所谓“表面”是指六个面,表面积是指六个面的总面积。这样以充实的感性认识为基础,使学生清晰地理解长方体表面积的意义。二、总体探索,多角度进行直观验证当学生已清晰地理解了长方体表面积的意义后,要充分地引导学生从总体上探索计算长方体表面积的方法。促使学生把自己学过的长方体特征和刚学习的表面积的意义联系起来,设想出计算表面积的各种途径,再引导学生逐一阐述每一种途径的
First, the observation of the operation, the meaning of the perceived surface area The significance of cuboid surface area is to explore the basis of the calculation method of cuboid surface area, teaching intentionally to cultivate students' concept of space and the concept of the formation of surface area, so that the concept of surface area in the minds of students real The formation of appearance not only helps students explore the method of calculating the surface area, but also lays a good foundation for the flexible use of calculation methods to solve practical problems. Teaching, first of all, by reviewing the characteristics of cuboid reproduction, and then use the model so that students touch the surface area of perception cuboid refers to the upper and lower, front and rear, left and right sides, and then expand the six faces, allowing students to intuitively understand the surface of the cuboid in space Perception based on the students to guide the so-called “surface ” refers to the six surface, surface area refers to the total area of six. This is based on a solid sense of perceptual knowledge that gives students a clear understanding of the meaning of cuboid surface area. Second, the overall exploration, visual verification from multiple angles When students have a clear understanding of the significance of cuboid surface area, we should fully guide students to explore the overall method of calculating the cuboid surface area. Prompt students to learn from their cuboid features and just learning the meaning of the surface area, imagine the various ways to calculate the surface area, and then guide students to elaborate on each of the ways