根据教材的编排特点,确定本节课的教学目标为:
1.掌握万以上数的大小比较方法,经历比较方法的形成过程,培养知识迁移和归纳概括的能力。
2.会把整万整亿的数改写成用万或亿作单位的数。
3.培养主动探究的精神和用数学的意识。
The New Year is coming and I have good wishes for the coming year.Firstly, I hope my families will be happy and in good health. I want my father has more free time to company my mother and I. I don’t want him work so hard all the time.Secondly, I wish myself can have a good year and do well in my study.Study is my priority now and I hope I can work hard and make progress.Finally, I want a new computer for my study and enjoyment.As I learn more in school, a computer is necessary.When I am free, I want to play computer games or search the Internet.I think my father would buy it for me.What are your wishes for next year?
新年就要到了,我对来年有着美好的愿望.首先,我希望家人健康快乐,希望爸爸能有更多的.时间陪我和妈妈,不要总是工作.其次,我希望自己来年顺利,成绩优异.学习是我现在最总要的事,我希望自己能努力学习,有所进步.最后,我想要一台新电脑,用于学习和娱乐.在学校学的东西越来越多,电脑是很有必要的.我空闲的时候,我想玩玩游戏或者上上网.我的爸爸应该会买给我.你来年的愿望又是什么呢?
师出示课本情境图。并提出:从图中你能获取哪些数学信息?通过这些数据,你能提出哪些数学问题?
学生可能提出:
1.中国、俄罗斯、美国的陆地面积共有多少平方千米?
2.这三个国家哪个国家的陆地面积最大?哪个国家的陆地面积最小?等等
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