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
我的同桌沈宇博,长得胖胖的,一张圆脸肥嘟嘟的,人高马大,特别爱玩游戏。
My deskmate Shen Yubo, fat, chubby face, big burly, especially like playing games.
记得有一天的自然课上,我正在专心致志的听老师讲课。突然,一个纸团从我眼前飞了过去,我定睛一看,原来是沈宇博在传纸条给他的好朋友——宋章彬。等纸条在从宋章彬那传过来时,我偷偷一看,原来他俩正在“纸上谈兵”——聊游戏。
Remember one day in the nature class, I was absorbed in listening to the teacher. Suddenly, a ball from my eyes flew past, I take a closer look, it is Shen Yubo to his good friend Song Zhangbin in passing notes. When the note came from Song Zhangbin, I stole a look. They were talking on paper.
我想:得阻止他们!于是,我等沈宇博把纸条传过去时,把纸团截住,藏了起来,他们还没发现。“喂,老宋,你把纸团传过来了吗?”沈宇博悄悄地对宋章彬说。“传过来了呀”。宋章彬说。
I think: stop them! So, I like Shen Yubo to note the past, the paper wanted to hide, they havent found. "Hello, Lao song, came to your paper?" Shen Yu said to Song Zhangbin quietly. "Here it is."". Song Zhangbin says.
正当他们疑惑时,下课铃响了。等到老师走后,沈宇博大叫一声:“解放喽!”然后叫上几个男同学,像一群马蜂一样冲出了教室。只见沈宇博双手做射击的动作,对准别人,只听“砰——”的一声,一位男同学“嗷——!”的一声倒在地上。唉,他们又在玩真人版电脑游戏了!我看着他们,无奈地摇了摇头。
Just when they were wondering, the bell rang. When the teacher left, Shen Yubo shouted, "liberation!"!" Then ask several male students, like a wasp like rushed out of the classroom. I saw Shen Yubo hands to do the shooting action, at others, just listen to "bang" sound, a male classmate "Ouch!" sound fell on the ground. Well, theyre playing live computer games again! I looked at them and shook my head helplessly.
这就是我的同桌——一个胖胖的,喜欢玩电脑游戏的人。
This is my deskmate -- a fat man who enjoys playing computer games.
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。
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