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人教版小学数学三年级上册《认识几分之几》优质课公开课课件、教案

2023-07-18 浏览:

三年级上册《几分之几》

教学内容:

人教版小学数学三年级上册第92页例4、例5 、例6

教学目标:

1、学生初步认识几分之几,会读写几分之几的分数,知道分数各部分的名称。 2.通过小组合作交流,学生的合作意识、语言表达能力和迁移类推能力得到培养。 3.在动手操作、观察比较中,学生勇于探索和自主学习的精神进一步提升,获得运用知识解决问题的成功体验。教学重点、难点: 1、在学生的头脑中形成“几分之几”的表象,初步认识几分之几,会读写几分之几。 2、学生对分数的含义有比较完整的认识。

3、会比较同分母分数的大小。教具准备:

课件;正方形纸和圆形纸若干张。

教学过程

一、复习铺垫

1.复习导入。

用分数表示阴影部分。

(  )  (  )  (  )

2.揭示课题。

今天我们将继续学习分数的相关知识。(板书课题) 几分之几

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二、实践探究

1.教学教材92页例4:认识四分之几。

(1)导语:同学们,这张正方形纸被平均分成了却份。

操作要求:请同学们根据自己的想法用你喜欢的颜色涂一涂,可任意涂几份,把你涂色的部分用分数表示出来,涂完后在小组内互相说一说你的想法。

学生实际操作,并展示作品。

(2)出示课件,指名提问:你涂了几份?涂色部分用哪个分数表示?为什么用这个分数来表示?

师:请同学们看课件,把一个正方形平均分成4份,给其中的一份涂上颜色。谁能用分数来表示出涂色部分,并说一说为什么用这个分数来表示?

(3)接下来要是再涂一份呢?那用分数又该怎么表示呢?(一份一个,两份2个二分之一,也就是。

(4)用同样的方法表示出43,来?

(5)师小结:这些正方形纸都被平均分成了4份,涂色部分是几,就用四分之几来表示。四分之几就是由几个四分之一组成的;四分之几与四分之一只是所取的份数不同。

2.教学教材92页例5:认识十分之几。

(1)课件出示一条1分米长的彩带,并把它平均分成10份。

(2)学生讨论:可以用哪个分数来表示其中的1份?3份用哪个分数来表示?7份呢?(教师板书)

(3)小结:像42、43、103、107这样的数,也都是分数。

3.加深对分数各部分含义的理解。

(1)请同学们说一说42、43、103、107这几个分数的分子和分母各是什么?

(2)小组内交流每个分数的分子和分母的含义。

(3)师小结:把一个物体或图形平均分成的份数就是这个分数的分母,表示这样的1份或几份的数就是分子。

(4)课件出示教材92页“做一做”1、2题,指名回答。

4.比较同分母分数大小的方法。教材93页 例6

(1)课件出示例6,学生独立完成,组内交流比较方法。

(2)全班交流比较方法。

方法一 看图比较。因为长方形大小一样,分的份数一样,每份大小一样,所以只要看哪个图形涂色的部分大,那个图形对应的分数就大。

方法二 通过观察,发现两个分数的分母一样,分子不一样,分子大的那个分数就大。

(3)用你喜欢的方法比较和的大小,全班交流。

(4)尝试比较和的大小,说一说是用什么方法进行比较的。

(5)通过上面分数的比较,你发现比较同分母分数大小的方法了吗?

(6)师生共同总结:分母相同的分数,分子大的分数大。

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三、巩固练习

1.请用不同的方法表示出一张纸的 。

2.完成教材94页第4题。

3.写出自己喜欢的分数,并说一说它们的含义。

四、课堂总结

同学们,这节课你们有哪些收获?

五、布置作业

教材第93页“做一做”第1题、第2题。教材95页 第8题。

板书设计 几分之几

像42、43、103、107这样的数,也都是分数。

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生物教学资源导航_师梦圆​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/​www.shimengyuan.com/shengwu/www.shimengyuan.com/shengwu/
政治教学资源导航_师梦圆​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/​www.shimengyuan.com/zhengzhi/www.shimengyuan.com/zhengzhi/
历史教学资源导航_师梦圆​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/​www.shimengyuan.com/lishi/www.shimengyuan.com/lishi/
地理教学资源导航_师梦圆​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/​www.shimengyuan.com/dili/www.shimengyuan.com/dili/
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