小學(xué)數(shù)學(xué)人教2011課標(biāo)版二年級(jí)認(rèn)識(shí)時(shí)間（一） (2).ppt

1、認(rèn)識(shí)時(shí)間（一）,二年級(jí)上冊(cè),1,上課。,同學(xué)們，仔細(xì)觀察鐘面，看看細(xì)心的你，能發(fā)現(xiàn)什么？,分針,時(shí)針,讓 我 們 一 起 來(lái) 認(rèn) 識(shí) 鐘 面 吧 ！,你能說(shuō)出鐘面上的數(shù)學(xué)元素和時(shí)間嗎？,3,3：00,（ ）時(shí),分針,時(shí)針,12,3,分針指向12，時(shí)針指向幾就是幾時(shí)。,4：00,（ ）時(shí),4,認(rèn)時(shí)間的小能手！,（ ）時(shí),8,8：00,11,12,10,1,2,3,4,5,6,9,8,7,仔細(xì)觀察鐘面上的格子，有什么特點(diǎn)？,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,( ),1,2,3,4,( ),每個(gè)大格 里有（ ）個(gè)小格,5,1,2,3,4,5,7,6,8,11,12

2、,10,9,5,10,25,30,20,15,60,35,40,45,50,55,每個(gè)大格 里有（ 5 ）個(gè)小格,一共有（ 60）個(gè)小格,11,12,10,1,2,3,4,5,6,9,8,7,鐘面上： 有12個(gè)大格 1大格有5小格,有60個(gè)小格,11,12,10,1,2,3,4,5,6,9,8,7,時(shí)針走1大格是1小時(shí),11,12,10,1,2,3,4,5,6,9,8,7,1,分針走1小格是1分。,12,1,2,3,4,5,6,7,8,9,10,11,1分鐘有多長(zhǎng)呢？,11,12,10,1,2,3,4,5,6,9,8,7,5,分針走1大格是5分。,11,12,10,1,2,3,4,5,6,9,

3、8,7,5,10,15,20,25,30,35,40,45,50,55,60,1,2,3,4,5,7,6,8,11,12,10,9,1時(shí)=60分,分針走一圈，時(shí)針走一個(gè)大格。 1時(shí) 60分,=,11,12,10,1,2,3,4,5,6,9,8,7,12：00,11,12,10,1,2,3,4,5,6,9,8,7,2：00,11,12,10,1,2,3,4,5,6,9,8,7,4：00,11,12,10,1,2,3,4,5,6,9,8,7,9：00多,11,12,10,1,2,3,4,5,6,9,8,7,5,4時(shí),4：05,5分,11,12,10,1,2,3,4,5,6,9,8,7,5,4：15,10,15,11,12,10,1,2,3,4,5,6,9,8,7,5,4：30,10,30,20,25,15,4時(shí)半,11,12,10,1,2,3,4,5,6,9,8,7,5,4：45,10,30,20,25,15,35,40,45,11,12,10,1,2,3,4,5,6,9,8,7,4：55,30,35,40,45,50,55,11,12,10,1,2,3,4,5,6,9,8,7,5：00,30,45,15,誰(shuí)最棒？,715,1150,