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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,*,24时计时法,24时计时法,1,绿色圃中小学教育网http:/,火车站,我下午,3,点就赶过来了,怎么还是晚了呢?,绿色圃中小学教育网http:/火,2,早上,8,时 动漫世界,上午,10,时 快乐星球,中午,12,时,30,分 新闻袋袋裤,下午,1,时 动画梦工厂,晚上,8,时 异想天开,深夜,12,时 童心回放,CCTV,少儿频道 节目预告,8,:,00,10,:,00,12,:,30,20,:,00,13,:,00,24,:,00,早上8时 动漫世,3,学习目标,(,1,)如果让你给这两种计时法分别取个名字,你会给它们取什么名字呢?你认为我们最主要的是要研究这两种计时法的哪一种?,(,2,)这两种计时法有什么关系?,(,3,)你更喜欢哪种计时法?,学习目标(1)如果让你给这两种计时法分别取个名字,你会给它们,4,它们分别是几时?,它们分别是几时?,5,同学们,现在是几时?,同学们,现在是几时?,6,上午表示:12:10,晚上表示:0:10,上午表示:12:10晚上表示:0:10,7,1.,时针在钟面上走一圈是多少小时?,12,小时是一天吗,?,想一想,3.,一天有多少小时,?,4.,时针一天在钟面上走几圈?,1.时针在钟面上走一圈是多少小时?12小时,8,12,9,1,8,7,6,4,3,2,5,11,10,0,0,10,月,28,日,129187643251110 0010月28日,9,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,129187643251110 0123456789101,10,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,129187643251110 0123456789101,11,12,9,1,8,7,6,4,3,2,5,11,10,13,0,1,2,3,4,5,6,7,8,9,10,11,12,13,129187643251110 1301234567891,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,15,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,12918764325131110 14150123456,13,12,9,1,8,7,6,4,3,2,5,13,11,10,14,15,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,12918764325131110 14150123456,14,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,12918764325131110 14161501234,15,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,12918764325131110 14161517012,16,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,18,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,12918764325131110 14161518170,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,12918764325131110 14161915181,18,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,12918764325131110 14161915181,19,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,12918764325131110 14161915181,20,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,12918764325131110 14161915181,21,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,12918764325131110 14161915181,22,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,12918764325131110 14161915181,23,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,23,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,23,12918764325131110 14161915181,24,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,24,23,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,23,24,12918764325131110 14161915181,25,凌晨,1,时,凌晨,2,时,凌晨,3,时,凌晨,4,时,凌晨,5,时,早上,6,时,早上,7,时,上午,8,时,上午,9,时,上午,10,时,上午,11,时,中午,12,时,下午,1,时,下午,2,时,下午,3,时,下午,4,时,下午,5,时,晚上,6,时,晚上,7,时,晚上,8,时,晚上,9,时,晚上,10,时,晚上,11,时,晚上,12,时,12,时记时法(又叫普通记时法),凌晨1时凌晨2时凌晨3时凌晨4时凌晨5时早上6时早上7时上午,26,24计时法:,在一天里钟表上的时钟走两圈,经常采用从0时到24时来计算的方法。,钟表外圈与内圈时刻的对照,24计时法:钟表外圈与内圈时刻的对照,27,三年级数学-24时计时法ppt课件,28,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,29,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,30,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,31,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,32,绿色圃中小学教育网http:/,2001,年,7,月,13,日,22,时,中国申奥成功,2005,年,10,月,12,日,9,时,“,神六”发射成功,绿色圃中小学教育网http:/2,33,上午表示:10:13,晚上表示:22:13,上午表示:10:13晚上表示:22:13,34,如果是上午表示几时?,晚上又表示几时?,如果是上午表示几时?,35,连一连,16:30,12:00,21:00,连一连16:3012:0021:00,36,你能给上面的钟面画上时针、分针吗?,你能给上面的钟面画上时针、分针吗?,37,绿色圃中小学教育网http:/,普通计时法,24,时计时法,起 床,上午,630,上 学,上午,700,午 休,中午,1200,放 学,下午,500,晚 饭,晚上,630,做作业,晚上,700,睡 觉,晚上,900,下面是小红作息时间表的一部分,你能用两种计时法来表示吗?,630,700,1200,1700,1830,1900,2100,绿色圃中小学教育网http:/普,38,小组合作讨论,1.,两种记时法有什么不同点?,2,、,12,时记时法表示的时刻怎样转化成,24,时记时法表示?,3,、,24,时记时法表示的时刻怎样转化成用,12,时记时法表示?,小组合作讨论1.两种记时法有什么不同点?,39,绿色圃中小学教育网http:/,(,8,12,20,),晚上,8,时,(普通计时法),20,时,(,24,时计时法),绿色圃中小学教育网http:/(,40,普通记时法,24,时记时法,下午,1,时,下午,2,时,下午,3,时,下午,4,时,下午,5,时,下午,6,时,晚上,7,时,晚上,8,时,晚上,9,时,晚上,10,时,晚上,11,时,晚上,12,时,13,时,15,时,16,时,17,时,18,时,19,时,20,时,21,时,22,时,23,时,24,时,14,时,或,0,时,普通记时法24时记时法下午1时下午2时下午3时下午4时下午5,41,这节课你学到了哪些知识?,这节课你学到了哪些知识?,42,你能用,24,时记时法播报节目吗,?,(同桌互相练习),红领巾广播站,节目预报,上午时分学校新气象,中午时儿童歌曲欣赏,下午时健康教育,下午时科学家故事,你能用24时记时法播报节目吗?红领巾广播站,43,绿色圃中小学教育网http:/,用的是哪种计时法?照样子填一填。,下午,648,2105,1530,凌晨,350,晚上,9,时,24,时计时法,普通计时法,绿色圃中小学教育网http:/用,44,时间,每天得到的都是,24,小,时,可是一天的时间给勤勉的人,带来了智慧与力量,给懒散的人,只能留下一片悔恨。,-,鲁迅,时间,每天得到的都是24小,45,
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