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【教学内容】北师大版三年级上册第45、46页。【教学过程】一、创设情境,感知周长1.借助课件创设童话情境。师:天气渐渐冷了,小蚂蚁也忘不了阳光体育运动,叶片就是它跑步的场地(课件出示)。谁来说说小蚂蚁跑的路线?生:沿着树叶的周围跑。生:沿着边线跑。师:对,小蚂蚁沿着叶片的边线跑。(课件标示:叶片的边线)师:它跑了多远呢?生:一周。(板书:一周)2.第二次课件演示小蚂蚁沿边线跑的情境。(没跑回起点)师:它第二次跑完一周了吗?
【Teaching content】 Beijing Normal University version of the third grade on the first 45,46 pages. [Teaching process] First, create a situation, perception perimeter 1. With courseware to create a fairy tale situation. Teacher: The weather is getting colder, the little ants can not forget the sunshine sports, and the leaves are the places where it runs (courseware shows). Who said the ants running the course? Health: running around the leaves. Health: run along the sidelines. Teacher: Yes, the little ants ran along the edge of the blade. (Courseware label: blade edge) Teacher: How long it ran? Health: a week. (Blackboard: a week) 2. The second courseware demo ant running along the sidelines of the situation. (Did not run back to the starting point) Teacher: Is it the second run for a week yet?