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本节课教学的主要内容是百分数的意义,百分数是在学生学过整数、小数和分数,特别是解决“求一个数是另一个数的几分之几”问题的基础上进行的教学,在教学中,叶玉琼老师从学生的生活实际入手,采用学生自主探究为主,教师点拨引导为辅的策略,让学生在生活实例中感知,在积极思辨中发现,在具体运用中理解百分数的意义。主要体现在以下几个方面:
","type":1},{"img_height":2000,"img_size":483,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/be079aeb0880d5ea8abae8e339237907__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":449,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/0d302f52d886f8d36f6a620a568f166e__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":479,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/f82a8895c57ad7c34c378b6cebb01e65__jpg.heic","img_width":2000,"source":0,"type":1},{"source":0,"text":"一、从学生感兴趣的事情入手,调动学生学习的兴趣
叶老师以学生熟悉并喜欢的人物姚明在NBA中的罚球命中率的有关统计数据引入课题,在本班学生活动的比一比谁投篮水平高的过程中引出了百分数,此时,学生已经隐约之中感悟到百分数是表示一个数是另一个数的几分之几的数,是为了比较大小而通分成分母是100的分数。这既体现了知识的连贯性,也让学生初步感悟了百分数的含义,及比较数据时使用百分数的好处
","type":1},{"img_height":2000,"img_size":445,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/f6a886ec1bbbace6ef6c1a9b8858c82d__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":497,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/1684334d77f9acf1839992cadd6f932c__jpg.heic","img_width":2000,"source":0,"type":1},{"source":0,"text":"二、密切联系生活,理解百分数的意义
百分数是在日常生产和生活中使用频率很高的知识,学生虽未正式认识百分数,但对百分数却并非一无所知。因此,叶老师在上课之前让学生调查生活中的百分数,可以让学生从中体会到百分数在生活中的广泛应用,认识到知识对于个人的意义,对激发内在的学习动机起到了很好的作用。在这节课中,叶老师直接把学生调查到的数据和问题作为学习和研究的对象,学生是在理解和解释自己及同学调查得来的数据的过程中认识百分数的。
","type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/c753f4beeabe010e3b85c640d5d8bc25__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/43c3a523919e9f78dc90c831d6d68ca0__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/0247eb994a20adb2a623ce513b7d412d__jpg.heic","img_width":1440,"source":0,"type":1},{"source":0,"text":"三、关注学生知识的形成过程
新课程理念强调,重视知识的形成过程,不能只关注结果。叶老师在《百分数的认识》这节课中,教学内容无论是素材的选取还是教学过程的设计都让学生体会和感受到了学习数学的必要性。没有直接告诉学生学习百分数有有什么作用,百分数的意义是什么,而是努力为学生创设数学交流、活动环境的素材,让学生感悟在生活中搜集到的具体的例子,让学生在探索学习中悟出一些百分数的意思,从而总结出百分数的意义,然后再解决应用到实际生活例子中。
","type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/10a11c8c9a604410e9c6b6af88b54c3d__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/9895a87b69621fb9c5c26ddf6f38b535__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/04107c9c1478f700bae79cd15cca3368__jpg.heic","img_width":1440,"source":0,"type":1},{"source":0,"text":" 叶老师在这节课的教学中, 内容设计合理,要点清晰,讲授条理清楚,层次渐进,过渡自然,效果好。具体体现如下:
1、叶老师这节课教学目的明确,围绕预定目标有条理的开展,重点突出,难点突破,双基落实较好。
2、在教学过程中,叶老师通过引导搜集资料,在通过对资料的分析、比较、归纳和概括,再从学生经常接触的事物、图表等感性材料提炼“百分数”,使学生能较好地结合身边的数学学习书中的数学。
3、在突破、解决百分数的意义时,设计一些分数和百分数比较的题目,让学生加以理解和区分分数和百分数。通过百分数与分数的联系与区别贯穿于教学中,效果较好。
4、将数学学习与培养学生动口动手的能力有机结合起来。如在学习百分数的认识知识后,教师引导学生用以解决三个问题:“说一说”、“读一读”、“写一写”,通过这三个问题,进一步巩固了学生对百分数知识的认识,还有效地培养了学生动脑动口动手的能力。
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","type":1},{"img_height":2000,"img_size":483,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/be079aeb0880d5ea8abae8e339237907__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":449,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/0d302f52d886f8d36f6a620a568f166e__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":479,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/f82a8895c57ad7c34c378b6cebb01e65__jpg.heic","img_width":2000,"source":0,"type":1},{"source":0,"text":"一、从学生感兴趣的事情入手,调动学生学习的兴趣
叶老师以学生熟悉并喜欢的人物姚明在NBA中的罚球命中率的有关统计数据引入课题,在本班学生活动的比一比谁投篮水平高的过程中引出了百分数,此时,学生已经隐约之中感悟到百分数是表示一个数是另一个数的几分之几的数,是为了比较大小而通分成分母是100的分数。这既体现了知识的连贯性,也让学生初步感悟了百分数的含义,及比较数据时使用百分数的好处
","type":1},{"img_height":2000,"img_size":445,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/f6a886ec1bbbace6ef6c1a9b8858c82d__jpg.heic","img_width":2000,"source":0,"type":1},{"img_height":2000,"img_size":497,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/1684334d77f9acf1839992cadd6f932c__jpg.heic","img_width":2000,"source":0,"type":1},{"source":0,"text":"二、密切联系生活,理解百分数的意义
百分数是在日常生产和生活中使用频率很高的知识,学生虽未正式认识百分数,但对百分数却并非一无所知。因此,叶老师在上课之前让学生调查生活中的百分数,可以让学生从中体会到百分数在生活中的广泛应用,认识到知识对于个人的意义,对激发内在的学习动机起到了很好的作用。在这节课中,叶老师直接把学生调查到的数据和问题作为学习和研究的对象,学生是在理解和解释自己及同学调查得来的数据的过程中认识百分数的。
","type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/c753f4beeabe010e3b85c640d5d8bc25__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/43c3a523919e9f78dc90c831d6d68ca0__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/0247eb994a20adb2a623ce513b7d412d__jpg.heic","img_width":1440,"source":0,"type":1},{"source":0,"text":"三、关注学生知识的形成过程
新课程理念强调,重视知识的形成过程,不能只关注结果。叶老师在《百分数的认识》这节课中,教学内容无论是素材的选取还是教学过程的设计都让学生体会和感受到了学习数学的必要性。没有直接告诉学生学习百分数有有什么作用,百分数的意义是什么,而是努力为学生创设数学交流、活动环境的素材,让学生感悟在生活中搜集到的具体的例子,让学生在探索学习中悟出一些百分数的意思,从而总结出百分数的意义,然后再解决应用到实际生活例子中。
","type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/10a11c8c9a604410e9c6b6af88b54c3d__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/9895a87b69621fb9c5c26ddf6f38b535__jpg.heic","img_width":1440,"source":0,"type":1},{"img_height":1080,"img_url":"https://ss-mpvolc.meipian.me/users/53184528/04107c9c1478f700bae79cd15cca3368__jpg.heic","img_width":1440,"source":0,"type":1},{"source":0,"text":" 叶老师在这节课的教学中, 内容设计合理,要点清晰,讲授条理清楚,层次渐进,过渡自然,效果好。具体体现如下:
1、叶老师这节课教学目的明确,围绕预定目标有条理的开展,重点突出,难点突破,双基落实较好。
2、在教学过程中,叶老师通过引导搜集资料,在通过对资料的分析、比较、归纳和概括,再从学生经常接触的事物、图表等感性材料提炼“百分数”,使学生能较好地结合身边的数学学习书中的数学。
3、在突破、解决百分数的意义时,设计一些分数和百分数比较的题目,让学生加以理解和区分分数和百分数。通过百分数与分数的联系与区别贯穿于教学中,效果较好。
4、将数学学习与培养学生动口动手的能力有机结合起来。如在学习百分数的认识知识后,教师引导学生用以解决三个问题:“说一说”、“读一读”、“写一写”,通过这三个问题,进一步巩固了学生对百分数知识的认识,还有效地培养了学生动脑动口动手的能力。
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