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1、1,认识时间,认识时间,沂河苑小学 胡楠,2,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,3,钟表上现在是什么时间?,钟表上现在是什么时间?,1,4,认识钟面,关于钟面你们都知道哪些知识?,5,6,1,2,3,4,5,7,6,8,11,12,10,9,12,7,1,2,3,4,5,7,6,8,11,12,10,9,( ),( ),5,10,15,8,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,9,12,60,5,10,1,2,3,4,5,7,6,8,11,12,10,9,1时=60分,1
2、1,1,2,3,4,5,7,6,8,11,12,10,9,12,1,2,3,4,5,7,6,8,11,12,10,9,5,13,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,20,25,30,35,40,45,50,55,14,11,12,10,1,3,4,5,6,9,8,7,5,9时 5分,9:05,想一想,15,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,6时25分,6:25,16,9时15分 9:15,17,11时55分 11:55,18,认一认,19,9时30分,9:30,6时40分,6:40,8时35分,8:35,20,钟
3、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。,12,60,1,1,5,1,60,21,=,分针走一圈,时针走一个大格。 1时=60分,22,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,23,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时 5分,4:05,24,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时30分或4时半,4:30,25,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时45分,4:45,26,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。,27,做一做,问题:你能准确写出每个钟表所表示的时间吗?,7:30,7:40,8:00,1:20,10:45,9:55,6:05,28,生活中的数学,29,这节课学到了什么?,30,再见,