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内容:小学数学第八册“小数的性质”。出示画有商品标价的挂图或投影片。师:我们在商店里,常常看到商品的标价,比如这副手套的标价是2.50元,这条毛巾的标价是3.00元。谁能说一说这里的2.50元、3.00元表示的是什么意思?生:2.50元表示2元5角,3.00元表示3元整。师:对了！2.50=2.5,3.00=3,也就是说小数的末尾添上零或者去掉零,小数的大小不变。请大家先想一想,然后讲一讲理由是什么?生:可以用元、角、分的化聚来说明道理。(学生边说,教师边画出下表)生:我用长度单位来讲解道理,如在米尺上标上数。
Content: Volume 8 of Elementary Mathematics, “The Nature of Decimals.” Draw a wall chart or slide showing the price of the product. Teacher: We often see in the store price of goods, such as the price of this pair of gloves is 2.50 yuan, the price of this towel is 3.00 yuan. Who can say here 2.50 yuan, 3.00 yuan is what does that mean? Health: 2.50 yuan said 2 yuan 5 angle, 3.00 yuan that 3 yuan whole. Teacher: Yes! 2.50 = 2.5,3.00 = 3, which means that the end of the decimal add zero or zero, the same size of the decimal. Please think about it, and then talk about what is the reason? Health: You can use yuan, angle, sub-poly to explain the truth. (Students said while the teacher draws the following table) Students: I use length units to explain the truth, as marked on the meter.