教学内容:人教版数学四年级上册第11页。教学过程:一、复习旧知,预备迁移1.21682652074 1596047 30671209(1)读出上面各数。(2)说一说上面各数分别是几位数?最高位是什么位?(3)6分别在什么数位上?说一说6在各个数中表示6个几?2.比较下面三组数据的大小,说说你是怎样比较的?825和8250 825和582 4859和4852教师小结:(1)两个数比较,位数多的大于位数少的。(2)位数相同的,先比较最高位,最高位上的数大的就大, Teaching content: PEP fourth grade on the first eleventh page. Teaching process: First, review the old knowledge, ready to migrate 1.21682652074 1596047 30671209 (1) Read the above numbers. (2) to talk about the number of the above are the number of each? The highest bit is what bit? (3) 6, respectively, what is the number of digits? Said that 6 in each number that 6? 2. Data size, talk about how you compare? 825 and 8250 825 and 582 4859 and 4852 Teacher Summary: (1) Comparison of two numbers, more than the number of digits greater than the median. (2) the same number of bits, first compare the highest bit, the highest bit on the large,