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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,小数的意义,第,1,课时,四年级下册第五单元,课堂引入,像,2.36,、,0.95,、,0.92,这些数是什么数呢？,想一想：,1元有几角,1,元,1,角是 元，还可以写成 元；,2,角是 元，还可以写成 元；,1,元,10,1,10,0.1,元,0.1,2,元,10,2,10,0.2,元,0.2,1,角,=,=,1,元有,10,角,5角=元=元,1cm=m=m,23cm=m=m,0.5,0.01,0.23,试,一,试,分数：,小数,：,分数：,小数,：,分数：,小数：,有 个 ,有 个0.1,你能用分数和小数表示下面阴影局部吗？,0.7,0.01,0.45,7,45,0.01,1,课堂探索,1,小数：,(),小数：,(),小数：,(),0.1,0.001,0.01,小数：,0.001,分数：,分数：,小数：,0.025,有 个 ,0.001,25,分数：,小数：,有 个 ,0.107,0.001,107,什么是小数？,像,0.7,，,0.45,，,0.025,，,0.107,这样 用来表示十分之几、百分之几、千分之几,的数，就是小数。,整数的计数单位有一 十百千万,讨论：小数的计数单位有哪些？,整数部分,小 数 点,小数部分,数位,名称,万位,千位,百位,十位,个位,.,十分位,百分位,千分位,万分位,计数,单位,十,一个,百,万,千,0.1,0.01,0.001,0.0001,每相邻两个计数单位间的进率是,10,。,1,小数：,(),小数：,(),小数：,(),0.1,0.001,0.01,看图说分数和小数。,0.4,0.043,0.23,1 m,0.01 m,m,通过这节课的学习，你学到了什么？,课堂总结,
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