《2019春三年級(jí)數(shù)學(xué)下冊(cè) 6《年、月、日》24時(shí)計(jì)時(shí)法課件1 (新版)新人教版.ppt》由會(huì)員分享,可在線閱讀,更多相關(guān)《2019春三年級(jí)數(shù)學(xué)下冊(cè) 6《年、月、日》24時(shí)計(jì)時(shí)法課件1 (新版)新人教版.ppt(39頁珍藏版)》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。
1、二十四時(shí)計(jì)時(shí)法,猜一猜,房老師可能在做什么?,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,,,
2、,,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,
3、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,
4、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,
5、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結(jié)束了,在這一天中,時(shí)針走了幾圈?一共經(jīng)過了多少個(gè)小時(shí)?,第一圈:從( )時(shí)到( )時(shí); 即從( )時(shí)到( )時(shí)。 第二圈:從( )時(shí)到( )時(shí);
6、 即從( )時(shí)到( )時(shí)。,0,12,深夜12,中午12,12,24,中午12,深夜12,0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24,12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12,,(2圈),(24個(gè)小時(shí)),12個(gè) 小時(shí),12個(gè) 小時(shí),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
7、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),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),下午2時(shí)是( )時(shí),中午12時(shí)是( )時(shí),早上6是( )時(shí),晚上11時(shí)30分是( )時(shí)( )分,4、用24時(shí)計(jì)時(shí)法表示下列時(shí)間,14,12,6,考考你,你知道下面鐘面上的時(shí)間用24時(shí)記時(shí)法表示是幾時(shí)嗎?,8:00,你知道下面鐘面上的時(shí)間用24時(shí)記時(shí)法表示是幾時(shí)嗎?,12:00,你知道下面鐘面上的時(shí)間
8、用24時(shí)記時(shí)法表示是幾時(shí)嗎?,10:00,你知道下面鐘面上的時(shí)間用24時(shí)記時(shí)法表示是幾時(shí)嗎?,17:00,銀行儲(chǔ)蓄業(yè)務(wù)上午幾時(shí)幾分開始,下午幾時(shí)分停止?,這一路公共汽車最早是幾時(shí)幾分開出?最晚呢?,從上午幾時(shí)幾分到下午幾時(shí)幾分這段路禁止小汽車通行?,媽媽去秦皇島,她下午幾時(shí)前到南京火車站比較合適?,你能用24時(shí)記時(shí)法播報(bào)節(jié)目嗎? (同桌互相練習(xí)),紅領(lǐng)巾廣播站 節(jié)目預(yù)報(bào) 上午時(shí)分學(xué)校新氣象 中午時(shí)兒童歌曲欣賞 下午時(shí)健康教育 下午時(shí)科學(xué)家故事,,24時(shí)計(jì)時(shí)法,普通計(jì)時(shí)法,早晨6:30,8:30,中午11:30,16:10,17:20,晚上8:00,晚上9:00,你能給上面的鐘面畫上時(shí)針、分針嗎?,后來,人們利用測太陽影子的方法來確定時(shí)間。,人們也利用滴水或漏沙的方法來確定時(shí)間。,再后來,人們發(fā)明了鐘表,計(jì)時(shí)就越來越準(zhǔn)確了。,時(shí)間,每天得到的都是24小 時(shí),可是一天的時(shí)間給勤勉的人 帶來了智慧與力量,給懶散的人 只能留下一片悔恨。 ---------魯迅,謝 謝,,,