从实物操作过渡到想象操作

• 作 者: 简化
• 机 构: 江苏凤凰教育出版社,
• 出 处: 教育视界
• 发表日期: 2015年12期
• 关键词: 数学活动经验 数学教学 密铺 操作活动 应用意识 数学美 对应图 空间观念 数量关系 等腰直角三角形

一、题目【题1】(1)把两个面积均为S的正方形(图1)剪成大小形状都相同的4块,然后把这4块拼成一个面积为2S的正方形。(先用实物剪拼,再画图表示)(2)图2是由8个面积均为S的正方形组成的“九宫缺一”纸片,把它剪成3块,然后把这3块拼成一个面积为8S的正方形。(先用实物剪拼,再画图表示)

Problem 1 Problem 1: (1) Cut two squares of size S (Figure 1) into four squares of the same size and shape, then put the four squares into a square with an area of ​​2S. (First physical cut spell, and then draw the figure) (2) Figure 2 is composed of eight squares are S square composed of “Jiu Gong missing a” piece of paper, cut it into three, then the three Put together an area of ​​8S square. (First physical cut spell, then draw the figure)