幻灯片1 |
| 1．知道1吨＝1000千克，能进行吨和千克间的简单换算。 2．借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念，培养学生初步的观察能力、想像能力、推理能力和估计重量的能力。 3．学生能在数学实践活动中，积极主动地与同学合作交流，体会数学与生活的密切联系，增强学习数学的兴趣和学好数学的信心，获得学习成功的体验。并通过学习渗透节约用水的环保意识。的密切联系，增强学习数学的兴趣和学好数学的信心，获得学习成功的体验。并通过学习渗透节约用水的环保意识。 |
幻灯片2 |
| 1、学生读一读。 2、了解还有比千克更大的单位吨。 3、揭题。今天这节我们就来认识吨。 |
幻灯片3 |
| 教学目标： 1．知道1吨＝1000千克，能进行吨和千克间的简单换算。 2．借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念，培养学生初步的观察能力、想像能力、推理能力和估计重量的能力。 3．学生能在数学实践活动中，积极主动地与同学合作交流，体会数学与生活的密切联系，增强学习数学的兴趣和学好数学的信心，获得学习成功的体验。并通过学习渗透节约用水的环保意识。的密切联系，增强学习数学的兴趣和学好数学的信心，获得学习成功的体验。并通过学习渗透节约用水的环保意识。 |
幻灯片4 |
| 备注： 借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念 |
幻灯片5 |
| 备注： 借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念 |
幻灯片6 |
| 备注： 借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念 |
幻灯片7 |
| 备注： 借助生活中的具体物体，感知和了解吨的含义，通过想像和推理初步建立1吨的质量观念 |
幻灯片8 |
| 备注： 生活中有很多物体的重量用“吨“作单位。下面这些物体的重量都是1吨，你能用吨来说一句话吗？ |
幻灯片9 |
| 备注： 举例体会。 找班级体重25千克的学生，感受25千克有多重。 再感受4个孩子的重量 想象40个这样的孩子在一起重量。 |
幻灯片10 |
| 备注： 1.1吨=1000千克 2.方法指导。一只熊猫50千克,50x20=1000,所以20只熊猫的重是1吨。 |
幻灯片11 |
| 备注： 1.学生完成在练习本上，校对得数。 2.哪些做错了？选择讲评。 |
幻灯片12 |
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幻灯片13 |
| 备注： 1.学生完成在练习本上，校对得数。 2.哪些做错了？选择讲评。 |
幻灯片14 |
| 备注： 1.计算 2.比较大小 3.解答反思 |
幻灯片15 |
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