《认识时间》(课堂PPT).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,*,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,*,认识时间,认识时间,沂河苑小学 胡楠,1,猜谜语,小小圆形运动场,三个选手比赛忙,跑的路程没多少,用的时间不一样,2,钟表上现在是什么时间？,钟表上现在是什么时间？,1,3,认识钟面,关于钟面你们都知道哪些知识？,4,1,2,3,4,5,7,6,8,11,12,10,9,5,1,2,3,4,5,7,6,8,11,12,10,9,12,6,1,2,3,4,5,7,6,8,11,12,10,9,(,),(,),5,10,15,7,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,8,1,2,3,4,5,7,6,8,11,12,10,9,12,60,5,9,1,2,3,4,5,7,6,8,11,12,10,9,1,时,=60,分,10,1,2,3,4,5,7,6,8,11,12,10,9,11,1,2,3,4,5,7,6,8,11,12,10,9,5,12,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,20,25,30,35,40,45,50,55,13,11,12,10,1,3,4,5,6,9,8,7,5,9,时,5,分,9:05,想一想,14,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,6,时,25,分,6:25,15,9,时,15,分,9,：,15,16,11,时,55,分,11,：,55,17,1:25,1时25分,8:05,8时5分,6:50,6时50分,认一认,18,9,时,30,分,9,：,30,6,时,40,分,6,：,40,8,时,35,分,8,：,35,19,填一填,钟面上有,个大格，,个小格。,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。,分，,圈，,分。,是,分。,12,60,1,1,5,1,60,20,=,分针走一圈，时针走一个大格。,1,时=,60,分,21,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,22,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时,5,分,4,:05,23,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时30分或4时半,4,:,30,24,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时4,5,分,4,:,4,5,25,时针走过数字,4,，分针从,12,起走,了多少个小格，就是,4,时多少分,。,26,做一做,问题：你能准确写出每个钟表所表示的时间吗？,7:30,7:40,8:00,1:20,10:45,9:55,6:05,27,生活中的数学,28,这节课学到了什么？,29,再见,30,