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备课是上好一节课的前提,是提高教学效率、保证教学质量的基础。为了充分发挥教师的集体智慧,促进教学质量的全面提升,探沂小学三年级数学组全体老师于11月11日下午举行了集体备课活动。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"7c413ead0d3a0169502bfb8f78ca84db"},"img_height":241,"img_url":"https://ss2.meipian.me/users/20072134/ca84a09466f04fada727b3d0b7f50114.jpg","img_width":966,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2E4NGEwOTQ2NmYwNGZhZGE3MjdiM2QwYjdmNTAxMTQuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"20c3c9cd856e4ce21f590014fab9c326"},"sectionPublished":false,"source":0,"text":"本次集备第八单元《分数的初步认识》,此次备课与以往有所不同,主要体现为每课例题、习题均单独制作教学课件和配套教案,例题课件要突出重、难点,教案中要用彩色文字写明突破重、难点的方法,要明确教师在教学中提出的核心问题。每课设置的配套习题,要一题一解,收集经典题目,数量不必过多,精讲精练即可。各位主备老师精心准备并一一进行汇报交流。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"47054866932c9899dc5057f937ef10f6"},"img_height":900,"img_size":389,"img_url":"https://ss2.meipian.me/users/20072134/e7fd8f95ba5485b481897479e949ab11.jpg","img_width":1200,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvZTdmZDhmOTViYTU0ODViNDgxODk3NDc5ZTk0OWFiMTEuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"2f9ab3b80a6ecffd61ce0a4f861b1da7"},"img_height":360,"img_size":49,"img_url":"https://ss2.meipian.me/users/20072134/06151240fe8137e2e90f04215204914c.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMDYxNTEyNDBmZTgxMzdlMmU5MGYwNDIxNTIwNDkxNGMuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"e877ac5a2c2b2740d938c7120b5a26fd"},"sectionPublished":false,"source":0,"text":"因为疫情原因,学生居家时间长,为了让学生保持健康的心理状态,对学生进行心理疏导。
在正式学习分数以前,学生已经会用“一半”这样的词来表达部分与整体的关系,只是还没有思考过要用什么符号来表示。教科书结合“分月饼、分图形”等具体问题情境,唤起学生已有的分数生活经验,利用实物操作等手段,帮助学生初步认识分数的意义。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"556767821dde78a6f96e068e31261849"},"img_height":360,"img_size":52,"img_url":"https://ss2.meipian.me/users/20072134/b7706a56b674bb982a5da2d42fbf3636.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYjc3MDZhNTZiNjc0YmI5ODJhNWRhMmQ0MmZiZjM2MzYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"0b666b71bb07f9c8daa1e0361e6b2e60"},"sectionPublished":false,"source":0,"text":"这部分内容是在学生掌握了一些整数知识的基础上初步认识分数的含义,从整数到分数是数概念的一次扩展,无论在意义上,读写方法上以及计算方法上,分数和整教都有很大差异。学生初次学习分数会感到困难。因此,本单元主要是创设一些学生所熟悉并感兴趣的现实情境,并通过动手操作,帮助学生理解一些简单的分数的具体含文,给学生建立初步的分数概念,为进一步学习分数和小数打下初步的基础。
考虑到儿童的年龄特点和指受能力,本单元在分数的范围上进行了一定的控制,只出现常见的分母比较小的分数(分母一般不要超过10),在编排上为了适应儿童的认知规律,先认识几分之一,再认识几分之几,所有这些措施都是为了便于学生更好地理解分数的含义,本单元安排的分数大小的比较和分数的加减法,其目的也要如此。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"d96f14b90038832c03f589c4f3217220"},"img_height":360,"img_size":49,"img_url":"https://ss2.meipian.me/users/20072134/cfff73ca3887302fbcf1d75a6c11835a.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2ZmZjczY2EzODg3MzAyZmJjZjFkNzVhNmMxMTgzNWEuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"9f0fc4f1e4bde7893bd46ef3825c9900"},"sectionPublished":false,"source":0,"text":"1.使学生初步认识几分之一和几分之几,会读、写简单的分数。知道分数各部分的名称。初步认识分数的大小。
2.会计算简单的同分母分数的加、减法。
3.在理解分数意义的基础上。使学生学会解决简单的有关分数加减法的实际问题,培养解决问题的意识。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"10e15c8c52da0cd2f02cfb851d0abdb9"},"img_height":360,"img_size":68,"img_url":"https://ss2.meipian.me/users/20072134/93526f4f9187c3d1b659af095f20f868.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvOTM1MjZmNGY5MTg3YzNkMWI2NTlhZjA5NWYyMGY4NjguanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"91fc72bf9688618727450e39cd6ae36e"},"sectionPublished":false,"source":0,"text":"重点:
1.使学生初步认识几分之一和几分之几,会读、写简单的分数,知道分数各部分的名称,初步认识分数的大小。
2.会计算简单的同分母分数的加减法。
难点:
在理解分数意义的基础上,使学生学会解决简单的有关分数加减法的实际问题,培养解决问题的意识。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"405e2aea3b5ec0574b5f6270b220d11a"},"img_height":360,"img_size":50,"img_url":"https://ss2.meipian.me/users/20072134/0ed5880f9ea6b0abac722d5fba40d9d6.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMGVkNTg4MGY5ZWE2YjBhYmFjNzIyZDVmYmE0MGQ5ZDYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"6fbf4ecd4681a082b90d6b07c22896a3"},"img_height":596,"img_url":"https://ss-mpvolc.meipian.me/users/20072134/9ea5984d06664f5395fd98f9a44e547b__jpg.heic","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvOWVhNTk4NGQwNjY2NGY1Mzk1ZmQ5OGY5YTQ0ZTU0N2JfX2pwZy5oZWlj/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"6995e3bd5da0fbc891e4e2bd0e357e3d"},"img_height":711,"img_size":109,"img_url":"https://ss2.meipian.me/users/20072134/2d9cc00569afcb57448b47c873e96516.jpg","img_width":1200,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMmQ5Y2MwMDU2OWFmY2I1NzQ0OGI0N2M4NzNlOTY1MTYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"d74d92a0fba03b96b82b114f44ddc6d0"},"sectionPublished":false,"source":0,"text":"例1、例2《认识几分之一》,老师们提出教学时要注意丰富表象支撑,初步理解分数含义。引出两个小朋友平均分月饼的问题后,借助学生已有的每人得到“半块”的生活经验,在如何表示“半块”的过程中引出分数,帮助他们理解一人一半就是每人分得这块月饼的二分之一。随后借助教材图片让学生想一想、说一说、折一折并用分数表示,通过这些活动使学生形成正确的表象,体会分数的具体含义。注意强调只有平均分才能得到它的几分之一,体会分的是“谁”就是“谁”的几分之一。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"82376efc693643ee51a3f9ab2ef549c7"},"img_height":1244,"img_size":127,"img_url":"https://ss2.meipian.me/users/20072134/cc855d303b46f5b8597775caf8246bb9.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2M4NTVkMzAzYjQ2ZjViODU5Nzc3NWNhZjgyNDZiYjkuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"56b34d80b7582d02c4bcedad81c5ba14"},"sectionPublished":false,"source":0,"text":"例3比较几分之一的大小,老师们认为指导学生比较分数大小的过程,可以分为以下三步:用分数表示图中部分与整体的关系→比较两个部分的大小→比较分数的大小。王晓梅老师建议可以让学生自己动手折纸再比,一定强调平均分的两张纸大小相同。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"6491f32fb7b86b575ab30824c19ffe74"},"img_height":1244,"img_size":149,"img_url":"https://ss2.meipian.me/users/20072134/80682ac7ca7b6d5a7554c8f1224d4e6a.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvODA2ODJhYzdjYTdiNmQ1YTc1NTRjOGYxMjI0ZDRlNmEuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"1e4a51f23a85e8e88c2ca0f4006ecdfb"},"sectionPublished":false,"source":0,"text":"对于《几分之几》中的例4例5,老师们指出本课的关键是引导学生理解四分之几是由几个四分之一组成的,四分之几与四分之一的不同之处在于表示的份数不同。另外,教学中要注重学生体会:把一个物体或图形平均分成几份,分母就是几,表示这样的几份分子就是几。嵇雪婷老师提醒大家注意,在实际教学中,发现例5学习时,学生可以将第一个线段用1/10,而单独表示第三个线段时可能会写3/10,这里需要讲明几分之一表示的其中的一份,与顺序无关。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"a5cd6d0c4284856b7c510878d5093093"},"img_height":1243,"img_size":159,"img_url":"https://ss2.meipian.me/users/20072134/b4db4f0789d585425108ec7b1ed0cdb6.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYjRkYjRmMDc4OWQ1ODU0MjUxMDhlYzdiMWVkMGNkYjYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"01a09b0e9622f6a086943740e4ac2d25"},"sectionPublished":false,"source":0,"text":"例6同分母分数的大小比较,老师们提出此内容是在学习完比较几分之一的基础上进行的,在比较同分母分数大小时,学生可以借助直观比较,也可以联系分数的含义或整体与部分的比较。尤其要有意识的让学生初步体会,当一个分数的分子与分母相同时,表示的份数与分的份数同样多,就是1。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"f6c4f628744908d977b42dc2ac912fdc"},"img_height":1239,"img_size":152,"img_url":"https://ss2.meipian.me/users/20072134/ab5741721ca36bd85f06871effc2af1c.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYWI1NzQxNzIxY2EzNmJkODVmMDY4NzFlZmZjMmFmMWMuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"a2a010eb69fc1ee66c3c95bfd73982a4"},"sectionPublished":false,"source":0,"text":"有关《分数的简单计算》这部分知识的学习,老师们提出可借助几何直观,通过分数的含义,让学生理解算理,体会算法。在教学过程中,老师还可以先让学生尝试计算,然后再进行动态展示,指导学生说明算理。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"3dc37fd5c37823643119f3feabba9480"},"img_height":616,"img_size":72,"img_url":"https://ss2.meipian.me/users/20072134/7edbd1d44ff0ddb8c782454edb6c6538.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvN2VkYmQxZDQ0ZmYwZGRiOGM3ODI0NTRlZGI2YzY1MzguanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"aa0ab062a73f351f47ca6404e4a7a282"},"sectionPublished":false,"source":0,"text":"对于《分数的简单应用》,老师们一致认可:在教学中,要通过剪一剪、涂一涂、摆一摆等多种活动,循序渐进让学生体会“1”可以是一个物体,也可以是一些物体。然后帮助学上理解当用分数表示整体与部分的关系时,平均分成几份分母就是几,表示其中的几份,分子就是几,表示几份就有几个1份那么多。
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初审:郇素娟
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","type":1},{"audio_music_id":0,"ext":{"unique_id":"7c413ead0d3a0169502bfb8f78ca84db"},"img_height":241,"img_url":"https://ss2.meipian.me/users/20072134/ca84a09466f04fada727b3d0b7f50114.jpg","img_width":966,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2E4NGEwOTQ2NmYwNGZhZGE3MjdiM2QwYjdmNTAxMTQuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"20c3c9cd856e4ce21f590014fab9c326"},"sectionPublished":false,"source":0,"text":"本次集备第八单元《分数的初步认识》,此次备课与以往有所不同,主要体现为每课例题、习题均单独制作教学课件和配套教案,例题课件要突出重、难点,教案中要用彩色文字写明突破重、难点的方法,要明确教师在教学中提出的核心问题。每课设置的配套习题,要一题一解,收集经典题目,数量不必过多,精讲精练即可。各位主备老师精心准备并一一进行汇报交流。
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在正式学习分数以前,学生已经会用“一半”这样的词来表达部分与整体的关系,只是还没有思考过要用什么符号来表示。教科书结合“分月饼、分图形”等具体问题情境,唤起学生已有的分数生活经验,利用实物操作等手段,帮助学生初步认识分数的意义。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"556767821dde78a6f96e068e31261849"},"img_height":360,"img_size":52,"img_url":"https://ss2.meipian.me/users/20072134/b7706a56b674bb982a5da2d42fbf3636.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYjc3MDZhNTZiNjc0YmI5ODJhNWRhMmQ0MmZiZjM2MzYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"0b666b71bb07f9c8daa1e0361e6b2e60"},"sectionPublished":false,"source":0,"text":"这部分内容是在学生掌握了一些整数知识的基础上初步认识分数的含义,从整数到分数是数概念的一次扩展,无论在意义上,读写方法上以及计算方法上,分数和整教都有很大差异。学生初次学习分数会感到困难。因此,本单元主要是创设一些学生所熟悉并感兴趣的现实情境,并通过动手操作,帮助学生理解一些简单的分数的具体含文,给学生建立初步的分数概念,为进一步学习分数和小数打下初步的基础。
考虑到儿童的年龄特点和指受能力,本单元在分数的范围上进行了一定的控制,只出现常见的分母比较小的分数(分母一般不要超过10),在编排上为了适应儿童的认知规律,先认识几分之一,再认识几分之几,所有这些措施都是为了便于学生更好地理解分数的含义,本单元安排的分数大小的比较和分数的加减法,其目的也要如此。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"d96f14b90038832c03f589c4f3217220"},"img_height":360,"img_size":49,"img_url":"https://ss2.meipian.me/users/20072134/cfff73ca3887302fbcf1d75a6c11835a.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2ZmZjczY2EzODg3MzAyZmJjZjFkNzVhNmMxMTgzNWEuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"9f0fc4f1e4bde7893bd46ef3825c9900"},"sectionPublished":false,"source":0,"text":"1.使学生初步认识几分之一和几分之几,会读、写简单的分数。知道分数各部分的名称。初步认识分数的大小。
2.会计算简单的同分母分数的加、减法。
3.在理解分数意义的基础上。使学生学会解决简单的有关分数加减法的实际问题,培养解决问题的意识。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"10e15c8c52da0cd2f02cfb851d0abdb9"},"img_height":360,"img_size":68,"img_url":"https://ss2.meipian.me/users/20072134/93526f4f9187c3d1b659af095f20f868.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvOTM1MjZmNGY5MTg3YzNkMWI2NTlhZjA5NWYyMGY4NjguanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"91fc72bf9688618727450e39cd6ae36e"},"sectionPublished":false,"source":0,"text":"重点:
1.使学生初步认识几分之一和几分之几,会读、写简单的分数,知道分数各部分的名称,初步认识分数的大小。
2.会计算简单的同分母分数的加减法。
难点:
在理解分数意义的基础上,使学生学会解决简单的有关分数加减法的实际问题,培养解决问题的意识。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"405e2aea3b5ec0574b5f6270b220d11a"},"img_height":360,"img_size":50,"img_url":"https://ss2.meipian.me/users/20072134/0ed5880f9ea6b0abac722d5fba40d9d6.jpg","img_width":1024,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMGVkNTg4MGY5ZWE2YjBhYmFjNzIyZDVmYmE0MGQ5ZDYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"6fbf4ecd4681a082b90d6b07c22896a3"},"img_height":596,"img_url":"https://ss-mpvolc.meipian.me/users/20072134/9ea5984d06664f5395fd98f9a44e547b__jpg.heic","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvOWVhNTk4NGQwNjY2NGY1Mzk1ZmQ5OGY5YTQ0ZTU0N2JfX2pwZy5oZWlj/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"6995e3bd5da0fbc891e4e2bd0e357e3d"},"img_height":711,"img_size":109,"img_url":"https://ss2.meipian.me/users/20072134/2d9cc00569afcb57448b47c873e96516.jpg","img_width":1200,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMmQ5Y2MwMDU2OWFmY2I1NzQ0OGI0N2M4NzNlOTY1MTYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"d74d92a0fba03b96b82b114f44ddc6d0"},"sectionPublished":false,"source":0,"text":"例1、例2《认识几分之一》,老师们提出教学时要注意丰富表象支撑,初步理解分数含义。引出两个小朋友平均分月饼的问题后,借助学生已有的每人得到“半块”的生活经验,在如何表示“半块”的过程中引出分数,帮助他们理解一人一半就是每人分得这块月饼的二分之一。随后借助教材图片让学生想一想、说一说、折一折并用分数表示,通过这些活动使学生形成正确的表象,体会分数的具体含义。注意强调只有平均分才能得到它的几分之一,体会分的是“谁”就是“谁”的几分之一。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"82376efc693643ee51a3f9ab2ef549c7"},"img_height":1244,"img_size":127,"img_url":"https://ss2.meipian.me/users/20072134/cc855d303b46f5b8597775caf8246bb9.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvY2M4NTVkMzAzYjQ2ZjViODU5Nzc3NWNhZjgyNDZiYjkuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"56b34d80b7582d02c4bcedad81c5ba14"},"sectionPublished":false,"source":0,"text":"例3比较几分之一的大小,老师们认为指导学生比较分数大小的过程,可以分为以下三步:用分数表示图中部分与整体的关系→比较两个部分的大小→比较分数的大小。王晓梅老师建议可以让学生自己动手折纸再比,一定强调平均分的两张纸大小相同。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"6491f32fb7b86b575ab30824c19ffe74"},"img_height":1244,"img_size":149,"img_url":"https://ss2.meipian.me/users/20072134/80682ac7ca7b6d5a7554c8f1224d4e6a.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvODA2ODJhYzdjYTdiNmQ1YTc1NTRjOGYxMjI0ZDRlNmEuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"1e4a51f23a85e8e88c2ca0f4006ecdfb"},"sectionPublished":false,"source":0,"text":"对于《几分之几》中的例4例5,老师们指出本课的关键是引导学生理解四分之几是由几个四分之一组成的,四分之几与四分之一的不同之处在于表示的份数不同。另外,教学中要注重学生体会:把一个物体或图形平均分成几份,分母就是几,表示这样的几份分子就是几。嵇雪婷老师提醒大家注意,在实际教学中,发现例5学习时,学生可以将第一个线段用1/10,而单独表示第三个线段时可能会写3/10,这里需要讲明几分之一表示的其中的一份,与顺序无关。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"a5cd6d0c4284856b7c510878d5093093"},"img_height":1243,"img_size":159,"img_url":"https://ss2.meipian.me/users/20072134/b4db4f0789d585425108ec7b1ed0cdb6.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYjRkYjRmMDc4OWQ1ODU0MjUxMDhlYzdiMWVkMGNkYjYuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"01a09b0e9622f6a086943740e4ac2d25"},"sectionPublished":false,"source":0,"text":"例6同分母分数的大小比较,老师们提出此内容是在学习完比较几分之一的基础上进行的,在比较同分母分数大小时,学生可以借助直观比较,也可以联系分数的含义或整体与部分的比较。尤其要有意识的让学生初步体会,当一个分数的分子与分母相同时,表示的份数与分的份数同样多,就是1。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"f6c4f628744908d977b42dc2ac912fdc"},"img_height":1239,"img_size":152,"img_url":"https://ss2.meipian.me/users/20072134/ab5741721ca36bd85f06871effc2af1c.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvYWI1NzQxNzIxY2EzNmJkODVmMDY4NzFlZmZjMmFmMWMuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"a2a010eb69fc1ee66c3c95bfd73982a4"},"sectionPublished":false,"source":0,"text":"有关《分数的简单计算》这部分知识的学习,老师们提出可借助几何直观,通过分数的含义,让学生理解算理,体会算法。在教学过程中,老师还可以先让学生尝试计算,然后再进行动态展示,指导学生说明算理。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"3dc37fd5c37823643119f3feabba9480"},"img_height":616,"img_size":72,"img_url":"https://ss2.meipian.me/users/20072134/7edbd1d44ff0ddb8c782454edb6c6538.jpg","img_width":1080,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvN2VkYmQxZDQ0ZmYwZGRiOGM3ODI0NTRlZGI2YzY1MzguanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"aa0ab062a73f351f47ca6404e4a7a282"},"sectionPublished":false,"source":0,"text":"对于《分数的简单应用》,老师们一致认可:在教学中,要通过剪一剪、涂一涂、摆一摆等多种活动,循序渐进让学生体会“1”可以是一个物体,也可以是一些物体。然后帮助学上理解当用分数表示整体与部分的关系时,平均分成几份分母就是几,表示其中的几份,分子就是几,表示几份就有几个1份那么多。
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","type":1},{"audio_music_id":0,"ext":{"unique_id":"d5a72e692aa99c1cbe5d53b3587d29c7"},"img_height":800,"img_size":603,"img_url":"https://ss2.meipian.me/users/20072134/28b2fb6a8d6b9157a9749c0e9e864642.jpg","img_width":1200,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvMjhiMmZiNmE4ZDZiOTE1N2E5NzQ5YzBlOWU4NjQ2NDIuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"e950467943143da6fb3729b5a6833b4e"},"sectionPublished":false,"source":0,"text":"三年级的集体备课研讨活动开展的很成功,每位主备人精心备课,研讨过程中,集思广益,相互补充,碰撞出很多的火花,取得了非常好的效果。在接下来的时间里,三年级组的老师们将一如既往,全身心地投入到教育教学当中。
","type":1},{"audio_music_id":0,"ext":{"unique_id":"4a16055c2e326c8b67f6e4d93c817915"},"img_height":366,"img_size":56,"img_url":"https://ss2.meipian.me/users/20072134/63707ed8a690d3c28d9cfe21005b3a99.jpg","img_width":808,"is_origin":false,"sectionPublished":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvMjAwNzIxMzQvNjM3MDdlZDhhNjkwZDNjMjhkOWNmZTIxMDA1YjNhOTkuanBn/nickname/5o6i5rKC5bCP5a2m5pWw5a2m/userid/MjAwNzIxMzQ=/sign/959fffe42f37d8e3ea917a01c12455df"},{"audio_music_id":0,"ext":{"unique_id":"3c8428096ece0ccd32aaa4e32eb57a5a"},"sectionPublished":false,"source":0,"text":"供稿:徐晓丽
初审:郇素娟
终审:宋 丽
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