相邻体积单位之间的进率(2)

相邻体积单位之间的进率(2)
教学内容:苏教版义务教育教科书第21~22页练习四第15~19题,思考题。

教学目标:
1、能正确应用体积单位间的进率进行名数的变换,并解决一些简单的实际问题。
2、进一步培养学生的分析问题解决问题的能力。
3、激发学生的数学学习信心。
教学重点与难点:
能正确应用体积单位间的进率进行名数的变换,并解决一些简单的实际问题。
教具:课件
教学过程:
一、复习
谈话:上节课我们认识了体积单位之间的进率,谁能说一说体积单位之间的进率是怎样的?它与面积单位、长度单位有什么不同?
这节课我们就继续运用这些知识来解决实际问题。
二、巩固练习
1、做练习四的第15题。
学生独立完成表格。
强调:计算时要正确应用相应的方法,并注意单位的正确。
2、做练习四的第16题。
提问:这两个问题不同在哪里?
3、做练习四的第17题。
指出:第(1)题求至少用多少铁皮,是求五个面的面积一共是多少,要注意弄清少的是哪一个面;第(2)题求最多可以盛水多少升,是求它的容积,可先按长方体的体积计算,再换算成容积。
4、做练习四的第19题。
学生独立解答,集体订正。
引导学生说说怎样想的?
四、拓展练习
1、思考题
2、阅读“你知道吗”
三、全课小结
这节课我们学习了哪些内容?你觉得那些地方值得我们引起注意?引导学生进行总结。
四、作业
测量自己家中一件长方体(或正方体)型的物体,算一算它的体积是多少立方米。

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