《2023年五年級(jí)數(shù)學(xué)上冊(cè)七總復(fù)習(xí)專題一數(shù)與代數(shù)小數(shù)乘法上課課件西師大版》由會(huì)員分享，可在線閱讀，更多相關(guān)《2023年五年級(jí)數(shù)學(xué)上冊(cè)七總復(fù)習(xí)專題一數(shù)與代數(shù)小數(shù)乘法上課課件西師大版（13頁珍藏版）》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。

1、西南師大,五年級(jí)上冊(cè),小數(shù)乘法,小數(shù)乘整數(shù),0.6525=,_,0.6 5,2 5,3 2 5,1 3 0,1 6 2 5,1 6.2 5,小數(shù)乘整數(shù)的計(jì)算方法,先按照整數(shù)乘法的計(jì)算方法算出積，再看因數(shù)中有幾位小數(shù)，就從積的后面數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)。,列豎式計(jì)算,3.4,1 6,2 0 4,3 4,5 4 4,3.416,.,=54.4,1 7,0.8,1 3 6,170.8,.,=13.6,練習(xí),2 3,4.4,9 2,9 2,1 0 1 2,234.4,.,=101.2,2 7.8,3 5,1 3 9 0,8 3 4,9 7 3 0,27.835,.,=973,小數(shù)乘小數(shù),試 一 試,0.

2、170.02,0.430.12,0.1 7,0.0 2,3 4,0.0 0,=0.0034,0.4 3,0.1 2,8 6,4 3,5 1 6,0.0,=0.0516,當(dāng)積的小數(shù)位不夠時(shí)，用,0,補(bǔ)足，再點(diǎn)小數(shù)點(diǎn)。,小數(shù)乘小數(shù)的計(jì)算方法,先按照整數(shù)乘法的計(jì)算方法算出積，再看因數(shù)中一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)。,0.050.25,0.370.28,0.2 5,0.0 5,1 2 5,0.0,=0.0125,0.3 7,0.2 8,2 9 6,7 4,1 0 3 6,0.,=0.1036,練習(xí),計(jì)算。,0.290.07 0.0560.15,0.2 9,0.0 7,=0.020

3、3,0.0 5 6,0.1 5,2 8 0,5 6,0.0 0 8 4 0,=0.0084,0.0 2 0 3,積的近似值,先計(jì)算，再填表。,算式,保留整數(shù),保留一位小數(shù),保留兩位小數(shù),42.80.27,1.364.5,3.162.4,12,11.6,11.56,8,6,6.1,6.12,7.6,7.58,取積的近似值的方法,先按照小數(shù)乘法的計(jì)算方法算出積，再看需要保留的小數(shù)位數(shù)下一位上的數(shù)字，若大于或等于,5,，向前一位進(jìn)一，若小于,5,，舍去。若小數(shù)近似值的末尾是,0,，這個(gè),0,必須保留。,王奶奶家有一片正方形的果園，果園邊長(zhǎng)是,0.25,千米，這片果園的面積是多少平方千米？（得數(shù)保留兩位小數(shù)）,練習(xí),0.250.25,0.06,（平方千米）,課堂小結(jié),通過這節(jié)課的學(xué)習(xí)活動(dòng)，你有什么收獲？,