三下24时计时法课件.ppt

24时计时法,执教：吴艳娟,新 闻 联 播,12,9,1,8,7,6,4,3,2,5,11,10,0,0,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,第一圈：从（）时到（）时；即从（）时到（）时。,0,中午12,12,深夜12,12小时,12,9,1,8,7,6,4,3,2,5,11,10,0,1,2,3,4,5,6,7,8,9,10,11,12,12,9,1,8,7,6,4,3,2,5,11,10,13,0,1,2,3,4,5,6,7,8,9,10,11,12,13,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,15,0,13,14,15,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,0,13,14,15,16,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,17,0,17,13,14,15,16,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,18,17,0,18,17,14,15,16,13,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,0,19,13,18,17,15,16,14,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,20,0,20,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,20,0,21,20,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,21,22,20,0,22,19,13,18,17,15,16,14,20,21,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,23,21,22,20,0,23,22,19,13,18,17,15,16,14,20,21,12,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,24,23,21,22,20,0,24,22,19,13,18,17,15,16,14,20,21,23,12,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,中午12,12,24,深夜12,12小时,中午12,深夜12,一天的时间,在一天里，钟表上 的时针正好走（）,2,圈,共,24,小时。所以，经常采用从 时到 时的计时法，通常叫做,24时计时法。,（）,0,24,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,24,23,21,22,20,1.内圈的数和外圈的数各表示什么？2.外圈的数和内圈的数有什么关系？,请思考：,上午 9时,晚上 9时,9时,21时,9+12=21,连线:,上午10时下午1时中午12时45分晚上12时45分早上6时晚上6时,12:456:001:000:4518:0013:0010:0022:00,我会学我会做,18：00,24：00或0：00,8：00,21：30,5：00,19：05,我会学我会做,用普通记时法表示下面的时刻。6时 12时 10时30分 23时 16时 20时45分,早上6：00,中午12：00,上午10：30,晚上11：00,下午4：00,晚上8：45,拨一拨：,8：00 10:00 晚上9时23时 0时,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,课下作业：,用24时计时法制作自己一天的时间,