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【教学内容】苏教版小学数学三年级下册第82~83页。【教学目标】1.经历长方形和正方形面积公式的探索过程,理解并掌握长方形和正方形面积的计算方法,能正确计算长方形和正方形的面积,并解决一些简单的实际问题。2.在操作、观察、猜想、类比、交流等数学活动中发展合情推理的能力,形成初步的解决问题的策略,培养空间观念。【教学过程】一、画图观察,问题定向谈话:下面每个小方格的面积是1平方厘米。在方格纸上画出面积是12cm2的不同的长方形,在小组里说一说长方形的长和宽各是多少厘米。学生在方格纸上操作后,组织交流不同的画法。
【Teaching content】 Sujiao primary school mathematics grade three volumes 82 ~ 83 pages. 【Teaching Objectives】 1. Through the process of exploring rectangular and square area formulas, understand and master the calculation methods of rectangular and square areas, correctly calculate the area of rectangular and square, and solve some simple practical problems. 2. Develop the ability of reasoning and reasoning in math activities such as operation, observation, conjecture, analogy and exchange to form a preliminary strategy for solving problems and to cultivate the concept of space. Teaching process First, the drawing observation, problem-oriented conversation: The following each small square area is 1 square centimeter. Draw different rectangles with an area of 12cm2 on the squared paper. In the group, let’s say how many centimeters each the length and width of the rectangle are. Students operate on graph paper and organize the exchange of different techniques.