1小數(shù)的加減法項(xiàng)目?jī)?nèi)容1.計(jì)算下面各題。754+3826=2000-493=2.見教材第72頁例1。分析與解答:(1)6.45+4.29=列豎式時(shí),()對(duì)齊,從()位加起,滿十進(jìn)一結(jié)果點(diǎn)上小數(shù)點(diǎn)并化簡(jiǎn)。6.45+4.2910.74(2)6.45-4.29=列豎式時(shí),()對(duì)齊,從()位減起,不夠減就從前一位“退一當(dāng)十”再減結(jié)果點(diǎn)上小數(shù)點(diǎn)。6.45-4.292.163.通過預(yù)習(xí), 我知道了,計(jì)算小數(shù)加減法時(shí),要把()對(duì)齊,也就是把()數(shù)位對(duì)齊,然后按照整數(shù)加、減法的法則進(jìn)行計(jì)算,得數(shù)小數(shù)部分末尾的0一般要()。4.直接寫得數(shù)。2.5+0.9=7.8+1.6=0.39+0.15=1.2-0.5=4.7-2.8=3-1.4=5.填空。溫馨提示知識(shí)準(zhǔn)備:小數(shù)的數(shù)位順序和整數(shù)加減法的計(jì)算方法等相關(guān)知識(shí)。1小數(shù)的加減法1.458015072.(1)10.74小數(shù)點(diǎn)低(2)2.16小數(shù)點(diǎn)低3.小數(shù)點(diǎn)相同去掉4.3.49.40.540.71.91.65.10.3216.0820.243.0844.40.454