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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,2018/6/29,#,时,、,分,、秒,学习目标：,1,、在实际情境中，要学会认识钟面以及时间单位时、分、秒。,2,、通过观察、操作等手段，要经历认识时、分、秒的过程。,3,、初步养成遵守和爱惜时间的良好习惯，要关注社会，关心时事，渗透爱国主义教育。,分针指着,12,，时针指着几就是几时。,3,时,10,时,12,时,1,2,3,4,5,7,6,8,11,12,10,9,分针（长针）,时针（短针）,7,时,7:00,钟面上有什么？,1.,指针：长的是,分针,，短的是,时针,2.,有,12,个数字（有,12,大格）,3.,每个大格有,5,小格,，有,60,个小格,1,2,3,4,5,7,6,8,11,12,10,9,1,12,5,小格,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,钟面上有,60,个小格,1,2,3,4,5,7,6,8,11,12,10,9,12,到,4,有（）小格,20,1,2,3,4,5,7,6,8,11,12,10,9,12,到,9,有（）小格,20,45,45,20,1,2,3,4,5,8,11,10,9,12,6,7,1,分,分针走,1,小格是,1,分,1,2,3,4,5,8,11,10,9,12,6,7,1,分,分针走,1,小格 是,1,分,20,分,15,分,10,分,5,分,1,2,3,4,5,7,6,8,11,12,10,9,12,到,6,有（）小格,就是（）分,30,30,30,30,分,也可说是,半小时,1,2,3,4,5,7,6,8,11,12,10,9,12,到,11,有（）小格,就是（）分,55,55,55,1,2,3,4,5,8,11,10,9,12,6,7,1,时,=,（,60,）分,1,2,3,4,5,7,6,8,11,12,10,9,分针,12,到,12,有（）小格，就是 （）分,60,60,60,1,时,=,（）分,60,1,2,3,4,5,7,6,8,11,12,10,9,1,2,3,4,5,7,6,8,11,12,10,9,比较这两个钟面，有什么不同？,1,2,3,4,5,7,6,8,11,12,10,9,1,2,3,4,5,7,6,8,11,12,10,9,8,时,8,时,时针指着,几,就是,几,时，如果在两个数之间，就,取小,的数字,1,2,3,4,5,7,6,8,11,12,10,9,时针,走过数字,8,8,时,分针,走了,20,小格,20,分,10,时,35,分,10:35,1,2,3,4,5,6,8,11,12,10,9,7,时针走过数字几,分针走过几个小格,10,时,35,个,1,2,3,4,5,7,6,8,11,12,10,9,7,时半,7:30,7,时,30,分,1,2,3,4,5,7,6,8,11,12,10,9,7,时,25,分,7:25,先看,时针,，,时针,走过,几,就是,几时,，,再看,分针,，,分针,走了,几小格,就是,几分,1,2,3,4,5,7,6,8,11,12,10,9,1,2,3,4,5,7,6,8,11,12,10,9,时针走过数字几,分针走过几个小格,7,时,55,分,7:55,1,2,3,4,5,7,6,8,11,12,10,9,10,时,5,分,10:05,1.,分针从“,12”,走到“,1”,，是（）分，,从“,12”,走到“,7”,，是（）分。,2.,时针走（）大格，分针正好走,（）圈，,1,小时,=,（）分,5,35,1,1,60,5,时,25,分,5:25,10,时,5,分,10:05,6,时,50,分,6:50,秒,的认识,1,秒的认识,秒针共走过,1,小格。就是,1,秒。,1,秒,1,秒钟你能做些什么？,飞机,1,秒,约行,250,米。,小汽车,1,秒,约行,20,米。,卫星,1,秒,约行,7900,米。,现代化工厂的流水线上,1,秒钟,可以生产出成千上万个零件。,有的电脑,1,秒钟,可以完成,3,万亿次运算。,系红领巾,端端正正写下“珍惜时间”,整理一次课桌,背诵,夜书所见,12,1,2,3,4,5,6,7,8,9,10,11,12,1,2,3,4,5,6,7,8,9,10,11,秒针共走过,3,大格，也就是,15,小格。是,15,秒。,1,分,60,秒,秒针走一圈经过了,60,秒,分针刚好走,1,小格,是,1,分,.,轻声地，一秒一秒地数，一直数到一分钟。,1,分你能做些什么？,大约每天睡,9,(),大约要,25,(),小时,分,秒,大约需要,20,(),一秒钟我们可以做什么？,一秒钟，可以呼吸,93,毫升空气。,一秒钟，可以让你的唾液随着你的喷嚏飞驰,100,米。,一秒钟，心脏跳动,1,次并将,60,毫升的血液输送到体内。,一秒钟，鼻腔中的纤毛摆动,4,次。,一秒钟，小肠里有,170,万细胞发生新陈代谢。,一秒种，猎豹在草原上可飞奔,28,米。,一秒钟，蜂鸟震翅,55,次。,一秒钟，全球平均降雨,420,吨。,一秒钟，深层海流在,4000,米深的海底向前流动,10,厘米。,一秒钟，格陵兰岛的冰川融化,1620,立方米。,一秒钟，地球绕太阳转动,298,公里。,一秒钟，地球从太阳接收,486,亿千瓦小时的能量。,一秒钟，地球表面的平均气温上升,0.00000000167,摄氏度。,一秒钟，太阳系在银河系内运行,220,公里。,一秒钟，宇宙空间里有,79,个星体发生爆炸结束其生命。,
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