《認(rèn)識(shí)時(shí)間》PPT課件.ppt
認(rèn)識(shí)時(shí)間,鐘面上都有什么?,大格,刻度,小格,時(shí)針,分針,1,2,3,4,5,7,6,8,11,12,10,9,12,1,2,3,4,5,7,6,8,11,12,10,9,5,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,鐘面上一共有60個(gè)小格。,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,鐘面上一共有()個(gè)大格,每大格里有()個(gè)小格,一共有()個(gè)小格。,12,5,60,1小時(shí),時(shí)針走一大格,時(shí)間經(jīng)過1小時(shí)。,1,2,3,4,5,6,7,8,9,10,11,12,分針走一圈,時(shí)間經(jīng)過分。,60,分針走一小格,時(shí)間經(jīng)過1分鐘。,5分,10分,20分,45分,55分,60分,=,分針走一圈,時(shí)針走一個(gè)大格。1時(shí)=60分,一節(jié)課是()分,課間休息是()分,再加上()分,就是1小時(shí)。,40,10,10,體驗(yàn)一小時(shí)有多長(zhǎng),11,12,10,1,3,4,5,6,9,8,7,2,從四時(shí)開始數(shù)。,4時(shí)5分,4:05,11,12,10,1,3,4,5,6,9,8,7,2,從四時(shí)開始數(shù)。,4時(shí)30分或4時(shí)半,4:30,11,12,10,1,3,4,5,6,9,8,7,2,從四時(shí)開始數(shù)。,4時(shí)45分,4:45,我會(huì)連線,認(rèn)一認(rèn),考考你,相信你一定行!,3:10,7:15,1:20,2:40,10:45,5:25,6:50,8:55,1、動(dòng)手操作。在你的鐘面上撥出6時(shí)25分。,2、小組合作。1人說時(shí)間,1人撥時(shí)間。,3、自主探究。撥一個(gè)自己喜歡的時(shí)間,并說說你在這個(gè)時(shí)間干什么?,鐘面上有,個(gè)大格,,個(gè)小格。,時(shí)針走個(gè)大格是,分針走個(gè)小格是,時(shí)針走個(gè)大格,分針正好走,走大格是,時(shí)。,分,,圈,,分。,是,分。,12,60,1,1,5,1,60,孩子們:,時(shí)間是一個(gè)魔法師,它使勤奮的人越來越聰明,使懶惰的人越來越愚蠢!時(shí)間對(duì)于我們來說是非常寶貴的,我們一定要珍惜時(shí)間呀!,