小數(shù)除法復(fù)習(xí)課件.ppt

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1、五年級數(shù)學(xué)上冊小數(shù)除法復(fù)習(xí)計(jì)算：7÷140.21÷0.30.68÷177.2÷0.181÷40.21÷0.30.57÷1.90.75÷2算一算，比一比2145÷1511700÷3621.45÷15117÷36除數(shù)是整數(shù)的小數(shù)除法，要按整數(shù)除法來算，關(guān)鍵是商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對齊。如果末尾有余數(shù)，在余數(shù)后面添0繼續(xù)除。9792÷7297.92÷0.72計(jì)算：除數(shù)是小數(shù)的除法計(jì)算法則先移動(dòng)除數(shù)的小數(shù)點(diǎn)，使它變成整數(shù)；除數(shù)的小數(shù)點(diǎn)向右移動(dòng)了幾位，被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位（位數(shù)不夠的，在被除數(shù)的末尾用“

2、0”補(bǔ)足）；然后按照除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算。除數(shù)是小數(shù)的除法：要轉(zhuǎn)化成除數(shù)是整數(shù)的小數(shù)除法來計(jì)算。計(jì)算的關(guān)鍵是在轉(zhuǎn)化成除數(shù)是整數(shù)的除法時(shí)小數(shù)點(diǎn)的處理。(看除數(shù)有幾位小數(shù)，就把除數(shù)和被除數(shù)的小數(shù)點(diǎn)同時(shí)向右移動(dòng)幾位)一看：看除數(shù)有幾位小數(shù)。二移：把被除數(shù)和除數(shù)的小數(shù)點(diǎn)同時(shí)向右移動(dòng)相同的位數(shù)，使除數(shù)變成整數(shù)。當(dāng)被除數(shù)位數(shù)不夠時(shí)，添“0”補(bǔ)足。三算：按照除數(shù)是整數(shù)的小數(shù)除法的方法計(jì)算。把下面除數(shù)是小數(shù)的除法轉(zhuǎn)化成除數(shù)是整數(shù)的除法如：21.6÷0.3=216÷34.725÷0.252.4÷0.125÷0.6計(jì)算

3、下面各題，得數(shù)保留兩位小數(shù)0.73×1.143.26×0.524.2÷4.57.24÷2.1