認(rèn)、讀幾時(shí)幾分.ppt

1、,時(shí) 分的認(rèn)識(shí),冀教版二年級(jí)數(shù)學(xué)下冊(cè),長(zhǎng)針（分針）,短針（時(shí)針）,認(rèn)識(shí)鐘面,短粗一點(diǎn)的是時(shí)針，細(xì)長(zhǎng)一點(diǎn)的是分針。,鐘面上有些什么？,討 論,12,1,2,3,4,5,6,7,8,9,10,11,看一看小鐘上面都有些什 么！,時(shí)針,分針,秒針,時(shí)針,分針,秒針,圖片新建文件夾,每個(gè)大格分成 個(gè)小格。,鐘面上一共有 個(gè)小格,5,鐘面上一共有,個(gè)大格。,12,60,12,1,2,3,4,5,6,7,8,9,10,11,5,10,15,20,25,30,35,40,45,50,55,60,大格,1,5,4,3,2,8,7,6,9,12,11,10,一共有 個(gè)大格,12,大格,小格,每個(gè)大格里面有 個(gè)小

2、格 一共有 個(gè)小格,5,10,15,20,25,30,35,40,45,50,55,60,5,60,小格,12,2,1,11,9,6,3,4,5,7,8,10,更多全套課件免費(fèi)下載： 綠色圃中小學(xué)教育網(wǎng),時(shí)針走1小時(shí)，分針正好走 ，是,分。,一圈,60,時(shí)= 分,1,60,分針走一小格的時(shí)間是1分。,時(shí)針走一大格的時(shí)間是1小時(shí)。,分,感受一分鐘,一分鐘的價(jià)值,一分鐘點(diǎn)鈔機(jī)點(diǎn)1500張人民幣 一分鐘高速火車(chē)可行駛1980米 一分鐘人造衛(wèi)星可運(yùn)行1920公里 一分鐘生產(chǎn)煤炭1902噸、發(fā)電106423度 一分鐘激光可走1800萬(wàn)公里，等于繞地球450圈,40,10,10,一節(jié)課是（ ）分 課間休息

3、是（ ）分 再加上（ ）分就是1小時(shí),填一 填,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,1 時(shí),1,鐘表上分針指著12，時(shí)針指著數(shù)字幾，這時(shí) 的時(shí)刻就是幾時(shí)。,00,：,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,4 時(shí),4：00,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,6 時(shí),6：00,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,9 時(shí),9

4、：00,注意：我們看幾時(shí)幾分，要先看時(shí)針，時(shí)針走過(guò)幾，就是幾時(shí)。 再看分針從12起走了幾個(gè)小格就是幾分，合起來(lái)就是幾時(shí)幾分。,當(dāng)看到分針走的小格不滿10小格時(shí)，寫(xiě)的時(shí)候要在：后面寫(xiě)上“0”。,小結(jié)：,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,鐘表上時(shí)針剛走過(guò)數(shù)字幾，分針從12起,走了多少個(gè)小格，,這時(shí)的時(shí)刻就是幾時(shí)幾分。,10時(shí)15分,：,10,15,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,4時(shí)45分,4：45,.,.,.,.,.,.,.,.,.,.,.,.,.,1

5、2,3,6,9,1,2,4,5,7,8,10,11,6時(shí)5分,6： 5,0,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,8時(shí)55分,8：5 5,.,.,.,.,.,.,.,.,.,.,.,.,.,12,3,6,9,1,2,4,5,7,8,10,11,時(shí)針剛過(guò)數(shù)字幾， 就是表示幾時(shí)多； 要問(wèn)多了多少分， 請(qǐng)你仔細(xì)看分針。,說(shuō)出鐘面所表示的時(shí)刻。,8時(shí),9時(shí)30分,7時(shí)35分,2時(shí)55分,寫(xiě)作: 3:09,寫(xiě)作: 4:15,讀作: 4時(shí)15分,讀作: 3時(shí)09分,寫(xiě)作: 10:50,讀作: 10時(shí)50分,認(rèn)一認(rèn)，寫(xiě)一寫(xiě)。,寫(xiě)作: 6:40,讀作: 6時(shí)40分,7:45,9:05,10:25,3:25,我會(huì)連。,4時(shí)12分,9時(shí)20分,6時(shí)08分,1時(shí)30分,8時(shí)55分,9:20,8:55,4:12,6:08,選擇正確的時(shí)刻,看鐘面,想一想 哪種動(dòng)