人教版小学二年级数学上册-认识时间-名师公开课教学PPT课件(1).ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,第七单元 认识时间,3,：,00,3,时,分针,时针,12,3,12,：,00,12,时,6,：,00,6,时,二、观察体验，活动探究,仔细观察钟面，同桌互相说一说钟面上还有些什么？,12,1,2,3,4,5,6,7,8,9,10,11,有大格和小格。,数一数钟面上的大格和小格。,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,20,25,30,35,40,45,50,55,60,1,2,3,4,5,7,68,11,12,10,9,人民日报社一分钟可以印刷报纸,1000,多份。,1,名职业打字员一分钟能打将近,300,个汉字。,铅笔厂一分钟生产,1600,支铅笔。,高铁最快一分钟走,5000,米。,在一分钟的时间内,能做些什么？,亲自感受一分钟有多长,放一首一分钟的歌曲，看看自己都干了些什么？,分针走,1,小格是,1,分。,12,1,2,3,4,5,6,7,8,9,10,11,1,分,分针在钟面上走,2,个小格的时间是几分？,3,小格、,4,小格呢？,2,分,3,分,4,分,分针从刻度,12,走到了刻度,1,，,经过了几分？,5,分,1.,钟面上一共有（）个大格，每,1,大格有（）个小格，一共有（,）个小格。,2,.,分针走,1,小格，时间经过（,）分，分针走,1,大格，时间经过（,）,分。,12,5,60,1,5,数一数或算一算，分针从刻度,12,走过每一个刻度数，各经过了几分钟。,小组合作交流：,11,12,10,1,2,3,4,5,6,9,8,7,5,11,12,10,1,2,3,4,5,6,9,8,7,5,10,11,12,10,1,2,3,4,5,6,9,8,7,15,5,10,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,11,12,10,12,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,60,钟面上有,个大格，,个小格。,(1),(2),时针走个大格是,分针走个小格是,时针走个大格，分针正好走,走大格是,时。,(3),(4),分，,圈，,分。,是,分。,12,60,1,1,5,1,60,1.,填一填。,一共有,（,1,）分针从,12,走到,6,，走了（,）分。,（,2,）时针从,12,走到,6,，走了（,）时。（,3,）分针从,3,走到,10,，走了（,）分。,（,4,）时针从,12,开始绕了一圈又走回,12,，走了（,）时。,30,6,35,12,2.,课堂小结,认识时间,分针走,1,小格是,1,分，,分针走,1,大格是,5,分，,分针走,1,圈是,60,分。,时针走,1,大格是,1,时，,时针走,1,圈是,12,时。,1,时,=60,分,一寸光阴一寸金，,寸金难买寸光阴。,