《蘇教版數(shù)學(xué)五年級(jí)上冊(cè)《小數(shù)的意義和讀寫(xiě)》課件.ppt》由會(huì)員分享,可在線閱讀,更多相關(guān)《蘇教版數(shù)學(xué)五年級(jí)上冊(cè)《小數(shù)的意義和讀寫(xiě)》課件.ppt(16頁(yè)珍藏版)》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。
1、小數(shù)的意義和讀寫(xiě),0.3元,0.05元,0.48元,橡皮的單價(jià) 0.3元是3角,信封的單 價(jià)是5分。,練習(xí)本的單價(jià)是4角8分,也可以說(shuō)成是48分。,橡皮,信封,練習(xí)本,用”角”或”分”作單位,說(shuō)說(shuō)價(jià)格,1元=10角 1角= 元,復(fù)習(xí):一位小數(shù),1元=100分 1分= 元,0.05元 = 5 分= 元 0.48元=4角8分=48分= 元,1分= 0.01元= 元,0.01讀作:零點(diǎn)零一, 0.05讀作:零點(diǎn)零五, 0.48讀作:零點(diǎn)四八。 請(qǐng)讀一讀,再舉幾個(gè)這樣的例子,同桌之間相互說(shuō)一說(shuō)。,把1米平均分成100份,每份長(zhǎng)1厘米。1厘米是 。,0.01米,米,,例2,米,把
2、4厘米和9厘米寫(xiě)成分?jǐn)?shù)和小數(shù)各是多少?,0.01米,米,,,,0.04,0.09,例2,0.001米,,把1米平均分成1000份,每份是1毫米。1毫米是 。,把7毫米和15毫米寫(xiě)成分?jǐn)?shù)和小數(shù)各是多少?,0.007米,,,0.015米,0.04米,0.015米,0.3元,比較上面每組中的分?jǐn)?shù)和小數(shù),你能發(fā)現(xiàn)什么?想一想,還有沒(méi)有位數(shù)更多的小數(shù)?在小組里進(jìn)行交流。,米,,元,,分母是10、100、1000的分?jǐn)?shù)都可以用小數(shù)表示。 一位小數(shù)表示十分之幾,兩位小數(shù)表示百分之幾,三位小數(shù)表示千分之幾,一個(gè)小數(shù)的小數(shù)部分含有幾個(gè)數(shù)位,這個(gè)小數(shù)就是幾位小數(shù)。 如0.3是一位小數(shù),0.04是兩位小數(shù),0.007是三位小數(shù)。 顯然,還有小數(shù)位數(shù)更多的小數(shù)。,0.7,0.43,0.009,讀出下面各數(shù),并說(shuō)出各表示幾分之幾。,0.39,0.108,0.006,0.5,0.80,,,,,,( ),( ),( ),( ),( ),( ),在括號(hào)里填上合適的小數(shù)。,0.3,0.256,0.021,0.8,0.37,0.02,