小学数学人教版四年级下册教学4单元小数的意义和性质5课时小数的大小比较

www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com3.05m＞2.93m＞2.88m＞2.84m小明小军小莉小红他们最后的名次是什么？探索新知二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com比较两个小数的大小，首先比较它们的整数部分，整数部分大的数大；整数部分相同，比较小数部分，从十分位上比起，十分位数字大的小数大；十分位上的数字相同，比较百分位上的数字，百分位上数字大的小数大，依次这样比下去。探索新知二想一想：怎样比较两个小数的大小？同桌交流 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com探索新知二说一说：小数大小的比较方法与整数大小的比较方法有什么联系？都是按照数位顺序，从高位比起，一位一位往下比。 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com巩固练习三1.比较下面每组中两个数的大小。3元2.6元6.35m6.53m4.7234.790.4580.54说一说比较的方法。＞＜＜＜教材做一做翼 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com＜＜＞2.巩固练习三教材P42T6 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com＜＞＞＜＝＜3.巩固练习三教材P42T7 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com4.巩固练习三教材P42T8