2022年冀教版数学一下《100以内数的大小比较》word教案 .pdf

名师精编优秀教案100 以内数的大小比较教学内容教科书第50、51 页内容。素质教学目标：知识目标：由生活经验提升为数学思考并用数学符号（、=、）表示，会比较100以内数的大小，进一步巩固100 以内数的顺序。能力目标：会用、=、表示两个数的大小，发展学生的观察、分析和实践能力。情感目标：通过充满童趣的故事，感受数学与生活的密切联系，培养积极思考、善于与人合作交流等良好的学习习惯。教学重点：用数学符号、=、表示两个数的大小。教学媒体：师：实物展示台、数字卡片。生：数字卡片。通用教案个性化教案教学结构和过程一、创设情境，提出问题师：果园里的桃子都成熟了，猴爸爸带着猴宝宝到果园里采桃子。到了中午，猴爸爸和猴宝宝都采了一篮的桃子，他俩可高兴了。猴爸爸对猴宝宝说：“我摘的桃子多。”猴宝宝看了看自己篮中的桃子说：“我的多!”小朋友们有什么办法让他俩知道到底谁采的桃子多吗？生：每个篮子里的桃子都倒出来数一数。师：你真聪明，小兔博士和你想的办法一样让他俩各自数一数。他俩数了数自己摘的桃子，猴宝宝发现自己摘了28 个，猴爸爸摘了34个。大家能当一回裁判，帮助他们比一比吗？学生热情很高，纷纷举手表示愿意。二、引导探索，学习新知1比一比。师：根据他们俩摘的个数，你会比较吗？生 1：我会比我觉得猴爸爸摘得多。因为数数的时候先数28，后数 34，所以 28 比 34 小。名师精编优秀教案师：这位同学按数的顺序，从小数到大，28 在前面，28 小。其他同学的办法呢？生 2：28 的十位是2，34 的十位是3，三十几比二十几多，所以34大。生 3：我也认为34 大，因为一个是三十几，28 才二十几。师：这两位同学的比较方法是正确的，比较两位数时，先比十位上的数，十位上的数大，这个数就大。如要十位上的数相等呢？例如28 和24 比，哪个大？生：28 比 24 大，因为个位数8 比 4 大。师：也就是说十位数一样大时，我们就比个位数，个位数大的，这个数就大。2用“”或“28。（带领全班同学读一读。）师：34 比 28 大，反过来也可以怎样说？生：28 比 34 小。师：大家会用数学符号表示吗？生：28 小于 34。教师板书出：28”或“”。教师引导学生观察图，从图中你能比较出哪个大，哪个小吗？生 1：我通过数，知道第二个数比第一个数少了3 个珠。所以46 比43 大。生 2：不要数，只要比较 46 和 43 的个位就行了，因为它们十位上的数字都一样。师：这两种方法都可以，46 和 43 十位上的数字一样，就比个位上的数。第 2 组呢？是不是个位上的珠子多，这个数就大啊？生：不是，还要看十位。37 的十位上只有3 个珠，而 41 的十位上有文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 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ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3名师精编优秀教案4 个珠。所以是41 大。师：对了，比较两位数的大小，我们应该从十位比起。（2）按要求把下面各数填在里。教师先帮助学生弄懂题意。师：从题目中，我们可以看出这些数是按照什么样的顺序排列？生：从小到大，因为题目中是用小于号连接。师：对，要注意看清符号。学生独立完成后集体交流。师：有些同学很快就完成了，请这些同学说说怎么比的。生 1：我是先找出十位上最小的数18，它是最小的，排在第一位，然后再找到十位上是2 的 23，说明它第二小，再找十位上是3 的，有两个数：34 和 38，比一比它们的个位，发现34 比 38 小，所以34 排第 3，38 排第 4，最后比40 和 60，40 比 60 小，所以40 排第五，60 排最后。生 2：我和同学相反，是从最大的找起，把最大的排在最右边。师：这两种方法都很好，比的时候有个相同的地方，就是从十位比起，十位一样时，再比个位数。（3）小鸡回家。教师引导学生看图。师：图上都画着什么？生 1：有一群小鸡，每只小鸡身上都有号码。生 2：还有两座房子，其中一座写着小于50 的；另一座写着大于50的。师：大家观察得很仔细。你们可以根据小鸡身上的号码把它们送回各自的家。学生采用连线的方式独立完成。同桌交流。五、实践作业、拓展延伸1跟爸爸、妈妈玩“读数、比大小”的游戏。（即由爸爸、妈妈读一个数，你找出一个比它小，一个比它大的数，并用符号连起来。）2小调查。我们学校一年级有几个班？各班各有多少人？哪班学生人数最多？哪班人数最少？文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 HR8Y5D5C2B3 ZE10I5X5J2H3文档编码:CU7T3D7A2C6 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