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    沈东波主页 >> 文章 >> 交流研究 >> 浏览信息《他们为什么做不出》

    交流研究 | 评论(2) | 阅读(1802)
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    星期四   晴天 
    主题 他们为什么做不出

    开学遇到几个孩子。还是老习惯,喜欢和他们闲聊。问他们开学学习了什么?他们都回答是:升和毫升。我逗他们,你能用手比划出1升有多大吗?出乎意料,他们都摇头,不能。想想六年级总复习,有些孩子在填写合适单位的题目,错的让人吃惊,一个橡皮的体积填的是立方分米,一个集装箱填的是立方厘米。只所以填错,不是他们没有学过这个单位,而是对于这个单位完全没有直观印象,最后所有的单位搅到一起,完全分不清。在单位的教学中,教师还是采用讲述式,学生就是记忆,这样的学习其实完全没有形成对于单位的正确认识。在七八十年代,有一些劳模在商店里做营业员,能做到一手抓。比如卖糖果,几斤几两一把就抓准,比称还准。他们对于重量单位如此精准,不是靠对于单位字面记忆,而是通过大量的用手的对于重量的感知。这对于我们的教学是有启发的,单位的学习,直观和感知应该是主要的教学方式,并且要有时间的保证。不要急着让学生做题,做纯纸面上的感知。今天我教学体积单位。回忆了长度单位、面积单位有哪些后?有尺子画出一厘米、一分米,一米太长,没画。接着我问,一平方厘米是如何规定的。没想到学生回答不出。我只好演示,一1厘米为边长,画出的就是1平方厘米。接着1平方分米,1平方米学生都说出了。这是我提问体积我们学习过了,体积单位有哪些?回答出立方厘米、立方分米、立方米。我问,根据上面的回忆,你认为1立方厘米如何规定。学生又冷场。这是任承杰举手,我让他说。他说:12个1平方厘米的正方形拼在一起就是1立方厘米。我就用软件立即操作,把12个1平方厘米拼在一起,问这是体积吗?任承杰立即反驳:我说的是12根1厘米的小棒。我马上明白他说的意思了。问为什么是12根,学生也反应过来,正方体有12 根棱。我立即用12根1厘米的小棒拼成一个正方体。再接下来解释1立方分米,1立方米就顺利成章。这个过程耗费了我好长时间,但我认为是值得的,让学生在思考、比较中直观感知体积单位。
    沈东波 发表于:2017-9-14 21:26:48

    评论 

    联系实际,手脑并用是有效的学习方式.
    白头翁 发表于:2017-9-28 15:36:40

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    码确 发表于:2018-9-2 1:35:32