4224时计时法课件新3

二十四时计时法,猜一猜，房老师可能在做什么？,12,9,1,8,7,6,4,3,2,5,11,10,0,0,10月24日,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,12,9,1,8,7,6,4,3,2,5,11,10,13,0,1,2,3,4,5,6,7,8,9,10,11,12,13,12,9,1,8,7,6,4,3,2,5,13,11,10,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,12,9,1,8,7,6,4,3,2,5,13,11,10,14,15,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,18,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,23,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,23,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,24,23,21,22,20,0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,9,16,17,18,19,20,21,22,23,24,一天结束了，在这一天中，时针走了几圈？一共经过了多少个小时？,第一圈：从（）时到（）时；即从（）时到（）时。第二圈：从（）时到（）时；即从（）时到（）时。,0,12,深夜12,中午12,12,24,中午12,深夜12,0123456789101112131415161718192021222324,12123456789101112123456789101112,（2圈）,（24个小时）,12个小时,12个小时,1、用24时计时法表示出下面的时刻,2、17时是下午几时？23时是晚上几时？,下午3时上午10时晚上9时下午6时晚上10时下午2时,15时,10时,21时,18时,22时,14时,3、用普通计时法表示下面的时刻,6时12时时30分24时16时18时45分,早上6时,中午12时,上午9时30分,下午6时45分,下午4时,深夜12时,下午2时是（）时,中午12时是（）时,早上6是（）时,晚上11时30分是（）时（）分,4、用24时计时法表示下列时间,14,12,6,考考你,你知道下面钟面上的时间用24时记时法表示是几时吗？,8:00,你知道下面钟面上的时间用24时记时法表示是几时吗？,12:00,你知道下面钟面上的时间用24时记时法表示是几时吗？,10:00,你知道下面钟面上的时间用24时记时法表示是几时吗？,17:00,银行储蓄业务上午几时几分开始，下午几时分停止？,这一路公共汽车最早是几时几分开出？最晚呢？,从上午几时几分到下午几时几分这段路禁止小汽车通行？,妈妈去秦皇岛，她下午几时前到南京火车站比较合适？,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,24时计时法,普通计时法,早晨6:30,8:30,中午11:30,16:10,17:20,晚上8:00,晚上9:00,你能给上面的钟面画上时针、分针吗？,后来,人们利用测太阳