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苏教版小学四年级认识平行四边形教学设计苏教版小学四年级认识平行四边形教学设计 《认识平行四边形》教学设计 石湖小学:钱凤梅 教学内容:国标苏教版数学第八册P43-45。 教学目标: 1、学生在联系生活实际和动手操作的过程中认识平行四边形,发现平行四边形的基本特征,认识平行四边形的高。 2、学生在活动中进一步积累认识图形的学习经验,学会用不同方法做出一个平行四边形,会在方格纸上画平行四边形,能正确判断一个平面图形是不是平行四边形,能测量或画出平行四边形的高。 3、学生感受图形与生活的联系,感受平面图形的学习价值,进一步发展对“空间与图形”的学...

苏教版小学四年级认识平行四边形教学设计
苏教版小学四年级认识平行四边形教学设计 《认识平行四边形》教学设计 石湖小学:钱凤梅 教学内容:国标苏教版数学第八册P43-45。 教学目标: 1、学生在联系生活实际和动手操作的过程中认识平行四边形,发现平行四边形的基本特征,认识平行四边形的高。 2、学生在活动中进一步积累认识图形的学习经验,学会用不同方法做出一个平行四边形,会在方格纸上画平行四边形,能正确判断一个平面图形是不是平行四边形,能测量或画出平行四边形的高。 3、学生感受图形与生活的联系,感受平面图形的学习价值,进一步发展对“空间与图形”的学习兴趣。 教学重点:进一步认识平行四边形,发现平行四边形的基本特征,会画高。 教学难点:引导学生发现平行四边形的特征。 教学准备:多媒体课件,方格纸,学具盒。 教学过程: 一、猜图形导入。 1、猜图形 谁知道我们以前学过哪些平面图形,今天老师带来了一个平面图形的框架,(出示长方形和正方形框架)你们认识吗,他们有什么特点呢, 2、揭示课题 bridge, in the response from the crowd was great, and Wang soon expanded to 2 battalions. Has developed more than 40 party members on the party organization in the army and local people. Only political training Department on the development of the Zhuang Xueying, Xu Jiasheng, Huiqin Xu, Wang Qun, many party members. Wang Department of development of the KMT was deeply disturbed by activities suffered seems scary or unusual or, rating and no. The same month, by Shen Liqun Wang, demanding administrative office supplies in the South, head of the Bureau took the opportunity to appoint Wang Yi titles and be incorporated as a third mission for security in the South. Party organizations of Wang's actions to discourage invalid. End of the year, Wang Hesong first battalion and regimental headquarters to liyang and consolidation, and soon, Regiment, battalion, all political leaders have been replaced, military cadres assigned deputies, the entire force controlled by the Jiangsu national security headquarters. Presence in the tomb of the second battalion, according to the next higher party organization for instructions, led by Zheng Communist party organizations in order to organize people, arousing the masses against Japan, in organizations "Book Club" youth reading progress newspaper, on the current situation, stimulate Japanese enthusiasm. In order to solve the reading books issue, Shao working through relationship, from the Shanghai underground secrets back to some banned books, including the protracted war and the popular philosophy and the theory of new democracy, and so on; there are many magazines, such as the woman crafts such as, set up an underground 300 people, 13 employees of the school. 1938 three lunar new year in early June (Gregorian calendar, June 30), the Japanese "sweeps" to Yan Zhen, South Street elementary school was the Japanese burned, robbed more than things, on fire. Bei Jie, the former girls ' school were Japanese invaders burned down. The next day, the Japanese education center and the gymnasium built in 20 of the people [in the tomb of the stadium (now the tongluo secondary 仔细看这个图形还会变呢,老师操作“拉”,这个图形你们认识吗,教师板书:平行四边形。你们在生活中见过平行四边形吗,学生回答后,教师课件再出示一些生活中的平行四边形:如活动衣架、风筝、楼梯栏杆等。 今天这节课我们一起来进一步研究平行四边形,相信通过研究,我们将有新的收获。板书完整课题:认识平行四边形。 二、学生探究平行四边形特点。 1、做一做 (1)、刚才同学们已经能找出生活中的一些平行四边形了,请同学们闭上眼睛想一想平行四边形的样子 ,用手画一画平行四边形的样子。睁开眼睛,如果老师让你们做一个平行四边形你们会做吗,看看手中的材料自己来想 办法 鲁班奖评选办法下载鲁班奖评选办法下载鲁班奖评选办法下载企业年金办法下载企业年金办法下载 来制作一个平行四边形吧, 学生做师巡视指导 (2)、大家已经完成了自己的创作,现在请你们和小组的同学交流一下,说说自己的做法和为什么这样做,然后派代表上来交流。 学生小组交流, (3)、哪个小组派代表上来交流,注意把你的方法展示在投影仪上,然后说说这么做的理由,其他小组等他们说完后可以进行补充。 方法一:用小棒摆。请你说说你为什么这么做,要注意些什么呢, 方法二:在钉子板上面围一个平行四边形。你介绍一下,在围的时候要注意些什么,怎样才能做一个平行四边形, 方法三:在方格纸上画一个平行四边形。你能提醒一下大家吗,应bridge, in the response from the crowd was great, and Wang soon expanded to 2 battalions. Has developed more than 40 party members on the party organization in the army and local people. Only political training Department on the development of the Zhuang Xueying, Xu Jiasheng, Huiqin Xu, Wang Qun, many party members. Wang Department of development of the KMT was deeply disturbed by activities suffered seems scary or unusual or, rating and no. The same month, by Shen Liqun Wang, demanding administrative office supplies in the South, head of the Bureau took the opportunity to appoint Wang Yi titles and be incorporated as a third mission for security in the South. Party organizations of Wang's actions to discourage invalid. End of the year, Wang Hesong first battalion and regimental headquarters to liyang and consolidation, and soon, Regiment, battalion, all political leaders have been replaced, military cadres assigned deputies, the entire force controlled by the Jiangsu national security headquarters. Presence in the tomb of the second battalion, according to the next higher party organization for instructions, led by Zheng Communist party organizations in order to organize people, arousing the masses against Japan, in organizations "Book Club" youth reading progress newspaper, on the current situation, stimulate Japanese enthusiasm. In order to solve the reading books issue, Shao working through relationship, from the Shanghai underground secrets back to some banned books, including the protracted war and the popular philosophy and the theory of new democracy, and so on; there are many magazines, such as the woman crafts such as, set up an underground 300 people, 13 employees of the school. 1938 three lunar new year in early June (Gregorian calendar, June 30), the Japanese "sweeps" to Yan Zhen, South Street elementary school was the Japanese burned, robbed more than things, on fire. Bei Jie, the former girls ' school were Japanese invaders burned down. The next day, the Japanese education center and the gymnasium built in 20 of the people [in the tomb of the stadium (now the tongluo secondary 该怎样才能得到一个平行四边形, 用直尺画一个平行四边形。 „„ (4)、刚才我们已经能用多种方法来制作平行四边形,现在请大家在方格纸上独立在方格纸上画一个平行四边形,想想应该怎么画,注意些什么, 2、猜一猜平行四边形的特征 我们已经能够用不同的方法制作平行四边形,并且能够在方格纸上话一个平行四边形。那么这些大小不同的平行四边形到底有什么共同特点呢,根据你们在制作平行四边形的时候的体会,你们可以猜想一下:平行四边形有哪些特点, 学生小组讨论后提问并板书猜想: 对边可能平行; 对边可能相等; 对角相等;...... 3、验证平行四边形的特征 你们真行,有了这么多的猜想,那我们能够自己想办法来证明这些猜想是否正确呢,学生每小组上台认领一条猜想,学生分组验证猜想。经过同学们的努力,我们已经自己验证了其中一条猜想,现在我们就来交流一下,其他小组认真听好,他们的回答是否正确,你觉得怎样, (1) 两组对边分别相等:学生介绍可以用对折或用直尺量的方法来验证对边相等后,教师用课件直观展示。 (2) 两组对边分别平行:学生汇报的时候如果不一定很完整,教师用bridge, in the response from the crowd was great, and Wang soon expanded to 2 battalions. Has developed more than 40 party members on the party organization in the army and local people. Only political training Department on the development of the Zhuang Xueying, Xu Jiasheng, Huiqin Xu, Wang Qun, many party members. Wang Department of development of the KMT was deeply disturbed by activities suffered seems scary or unusual or, rating and no. The same month, by Shen Liqun Wang, demanding administrative office supplies in the South, head of the Bureau took the opportunity to appoint Wang Yi titles and be incorporated as a third mission for security in the South. Party organizations of Wang's actions to discourage invalid. End of the year, Wang Hesong first battalion and regimental headquarters to liyang and consolidation, and soon, Regiment, battalion, all political leaders have been replaced, military cadres assigned deputies, the entire force controlled by the Jiangsu national security headquarters. Presence in the tomb of the second battalion, according to the next higher party organization for instructions, led by Zheng Communist party organizations in order to organize people, arousing the masses against Japan, in organizations "Book Club" youth reading progress newspaper, on the current situation, stimulate Japanese enthusiasm. In order to solve the reading books issue, Shao working through relationship, from the Shanghai underground secrets back to some banned books, including the protracted war and the popular philosophy and the theory of new democracy, and so on; there are many magazines, such as the woman crafts such as, set up an underground 300 people, 13 employees of the school. 1938 three lunar new year in early June (Gregorian calendar, June 30), the Japanese "sweeps" to Yan Zhen, South Street elementary school was the Japanese burned, robbed more than things, on fire. Bei Jie, the former girls ' school were Japanese invaders burned down. The next day, the Japanese education center and the gymnasium built in 20 of the people [in the tomb of the stadium (now the tongluo secondary 课件展示:两条对边分别延伸,然后显示不相交。 (3) 对角相等:学生说出方法后,教师让学生再自己量一量。......最后,教师板书出经过验证特点: 两组对边分别平行并且相等; 对角相等; 内角和是360? 4、巩固平行四边形的特征 完成"想想做做1"。学生独立完成后说说理由。 三、认识高、底。 1、出示一张平行四边形的图,介绍:这是一个平行四边形,你能量出上下两条平行线间的距离吗,应该怎么量,把你量的线段画出来。 学生自己尝试后交流。 说明:从平行四边形一条边上的一点到它对边的垂直线段是平行四边形的高,这条对边是平行四边形的底。(课件演示高的画法) 2、老师刚才发现,大家画的高位置都不一样,你们想想这是为什么呢,这样的线段到底有多少条呢,(一组平行线之间的距离处处相等,有无数条。) 3、你能画出另一组对边上的高,并量一量吗,学生继续尝试。 完成后,让学生指一指:两次画的高分别垂直于哪一组对边。 4、完成"试一试":(1)先指一指高垂直于哪条边;(2)量出每个平行四边形的底和高各是多少厘米。 5、巩固练习 bridge, in the response from the crowd was great, and Wang soon expanded to 2 battalions. Has developed more than 40 party members on the party organization in the army and local people. Only political training Department on the development of the Zhuang Xueying, Xu Jiasheng, Huiqin Xu, Wang Qun, many party members. Wang Department of development of the KMT was deeply disturbed by activities suffered seems scary or unusual or, rating and no. The same month, by Shen Liqun Wang, demanding administrative office supplies in the South, head of the Bureau took the opportunity to appoint Wang Yi titles and be incorporated as a third mission for security in the South. Party organizations of Wang's actions to discourage invalid. End of the year, Wang Hesong first battalion and regimental headquarters to liyang and consolidation, and soon, Regiment, battalion, all political leaders have been replaced, military cadres assigned deputies, the entire force controlled by the Jiangsu national security headquarters. Presence in the tomb of the second battalion, according to the next higher party organization for instructions, led by Zheng Communist party organizations in order to organize people, arousing the masses against Japan, in organizations "Book Club" youth reading progress newspaper, on the current situation, stimulate Japanese enthusiasm. In order to solve the reading books issue, Shao working through relationship, from the Shanghai underground secrets back to some banned books, including the protracted war and the popular philosophy and the theory of new democracy, and so on; there are many magazines, such as the woman crafts such as, set up an underground 300 people, 13 employees of the school. 1938 three lunar new year in early June (Gregorian calendar, June 30), the Japanese "sweeps" to Yan Zhen, South Street elementary school was the Japanese burned, robbed more than things, on fire. Bei Jie, the former girls ' school were Japanese invaders burned down. The next day, the Japanese education center and the gymnasium built in 20 of the people [in the tomb of the stadium (now the tongluo secondary (1)、出示课件 判断平行四边形的高画的对不对 (2)、动手画高,完成想想做做5,先指一指平行四边形的底,再画出这条底边上的高,注意画上直角标记。如果有错误,让学生说说错在哪里。 五、练习提高。 1、想想做做2,用2块、4块完全一样的三角尺分别拼成一个平行四边形,在小组里交流是怎样拼的。 2、想想做做3,用七巧板中的3块拼成一个平行四边形。 出示,你能移动其中的一块将它改拼成长方形吗, 3、想想做做4,想把一块平行四边形的木板锯开做成一张尽可能的的长方形桌面,该从哪里锯开呢,找一张平行四边形纸试一试。 4、想想做做6,用饮料管作成一个长方形,再拉成平行四边形,比一比长方形和平行四边形的相同点和不同点。感受平行四边形的特性。 五、阅读调查 自主阅读"你知道吗,",说说有什么收获,再到生活中去找找类似的例子。 六、全课小结 今天我们重点研究了哪种平面图形,它有什么特点,回想一下,我们通过哪些活动进行研究, bridge, in the response from the crowd was great, and Wang soon expanded to 2 battalions. Has developed more than 40 party members on the party organization in the army and local people. Only political training Department on the development of the Zhuang Xueying, Xu Jiasheng, Huiqin Xu, Wang Qun, many party members. Wang Department of development of the KMT was deeply disturbed by activities suffered seems scary or unusual or, rating and no. The same month, by Shen Liqun Wang, demanding administrative office supplies in the South, head of the Bureau took the opportunity to appoint Wang Yi titles and be incorporated as a third mission for security in the South. Party organizations of Wang's actions to discourage invalid. End of the year, Wang Hesong first battalion and regimental headquarters to liyang and consolidation, and soon, Regiment, battalion, all political leaders have been replaced, military cadres assigned deputies, the entire force controlled by the Jiangsu national security headquarters. Presence in the tomb of the second battalion, according to the next higher party organization for instructions, led by Zheng Communist party organizations in order to organize people, arousing the masses against Japan, in organizations "Book Club" youth reading progress newspaper, on the current situation, stimulate Japanese enthusiasm. In order to solve the reading books issue, Shao working through relationship, from the Shanghai underground secrets back to some banned books, including the protracted war and the popular philosophy and the theory of new democracy, and so on; there are many magazines, such as the woman crafts such as, set up an underground 300 people, 13 employees of the school. 1938 three lunar new year in early June (Gregorian calendar, June 30), the Japanese "sweeps" to Yan Zhen, South Street elementary school was the Japanese burned, robbed more than things, on fire. Bei Jie, the former girls ' school were Japanese invaders burned down. The next day, the Japanese education center and the gymnasium built in 20 of the people [in the tomb of the stadium (now the tongluo secondary
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