人教版小學(xué)三年級(jí)《24時(shí)計(jì)時(shí)法》課件

24時(shí)計(jì)時(shí)法,年、月、日,聯(lián)系生活：,問(wèn)題：小紅的一天是怎樣度過(guò)的，她都做了什么事情？請(qǐng)你用“早上幾時(shí)、中午幾時(shí)、晚上幾時(shí)，小紅在做什么”這樣的句式說(shuō)說(shuō)。,操作活動(dòng)：,（2）全班交流。,活動(dòng)：拿出鐘表?yè)軙r(shí)針，說(shuō)一說(shuō)。,要求：（1）2人合作，邊撥邊說(shuō)說(shuō)自己的發(fā)現(xiàn)。,（3）回答問(wèn)題。,（1）從0時(shí)到中午12時(shí)，經(jīng)過(guò)了（）小時(shí)。,（2）從中午12時(shí)再到0時(shí)，又經(jīng)過(guò)了（）小時(shí)。,（3）一天是（）小時(shí)。,經(jīng)過(guò)一天，鐘面上的時(shí)針轉(zhuǎn)了（）圈。,12,12,2,24,12,9,1,8,7,6,4,3,2,5,11,10,0,0,半夜12時(shí)也叫0時(shí),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,認(rèn)真觀察：,問(wèn)題：鐘面上有紅色、藍(lán)色兩圈，如果把鐘面上時(shí)針走過(guò)的一天的時(shí)間展開(kāi)，會(huì)是什么樣子呢？,轉(zhuǎn)化計(jì)時(shí)法：,問(wèn)題：上午9時(shí)用24時(shí)計(jì)時(shí)法是幾時(shí)？下午5時(shí)用24時(shí)計(jì)時(shí)法是幾時(shí)？晚上9時(shí)呢？說(shuō)一說(shuō)你是怎么知道的。,第一圈,第二圈,1、用24時(shí)計(jì)時(shí)法表示出下面的時(shí)刻,2、17時(shí)是下午幾時(shí)？23時(shí)是晚上幾時(shí)？,下午3時(shí)上午10時(shí)晚上9時(shí)下午6時(shí)晚上10時(shí)下午2時(shí),15時(shí),10時(shí),21時(shí),18時(shí),22時(shí),14時(shí),下午5時(shí),晚上11時(shí),3、用普通計(jì)時(shí)法表示下面的時(shí)刻,6時(shí)12時(shí)時(shí)30分24時(shí)16時(shí)18時(shí)45分,早上6時(shí),中午12時(shí),上午9時(shí)30分,下午6時(shí)45分,下午4時(shí),深夜12時(shí)（0時(shí)）,4、這是一個(gè)新設(shè)郵筒，每天取3次信，早上8時(shí)30分第一次取信，以后每隔4小時(shí)取一次信。請(qǐng)標(biāo)出每次取信的時(shí)間。,取信時(shí)間,第一次：,第二次：,第三次：,8：30,12：30,16：30,你是怎樣想的？說(shuō)說(shuō)你的想法？,碧水小學(xué)2016年夏季作息時(shí)間表,通過(guò)今天的學(xué)習(xí)，你有什么收獲?,同學(xué)們：今天的學(xué)習(xí)開(kāi)心嗎？,今