《2021年秋五年級數(shù)學(xué)上冊第5單元小數(shù)乘法和除法第9課時(shí)一個(gè)數(shù)除以小數(shù)二被除數(shù)的小數(shù)位數(shù)比除數(shù)少的小數(shù)除法習(xí)題課件蘇教版》由會(huì)員分享,可在線閱讀,更多相關(guān)《2021年秋五年級數(shù)學(xué)上冊第5單元小數(shù)乘法和除法第9課時(shí)一個(gè)數(shù)除以小數(shù)二被除數(shù)的小數(shù)位數(shù)比除數(shù)少的小數(shù)除法習(xí)題課件蘇教版(11頁珍藏版)》請?jiān)谘b配圖網(wǎng)上搜索。
1、5,小數(shù)乘法和除法,第,9,課時(shí) 被除數(shù)的小數(shù)位數(shù)比除數(shù)少的小數(shù)除法,1,2,3,4,5,6,提示,:,點(diǎn)擊 進(jìn)入習(xí)題,7,,知識點(diǎn),,被除數(shù)的小數(shù)位數(shù)比除數(shù)少的小數(shù)除法的計(jì)算方法,1,.想一想,填一填。,,0.8÷0.25,=,(,,)÷,25,,8.7÷0.29,=,(,,)÷29,,15.3÷0.45,=,(,,)÷45,,我發(fā)現(xiàn):當(dāng)移動(dòng)除數(shù)的小數(shù)點(diǎn)使除數(shù)變成,(,,),時(shí),被除數(shù)的位數(shù)不夠,要在被除數(shù)的末尾,(,,),補(bǔ)足。,80,870,153,整數(shù),添,0,2,.算一算,填一填。,,43.8÷0.73,=,60,6,0,4,3,8,除數(shù)的小數(shù)點(diǎn)向右移動(dòng),(,,),位,被
2、除數(shù)的小數(shù)點(diǎn)也向右移動(dòng),(,,),位,被除數(shù)位數(shù)不夠,要,(,,),補(bǔ)足。,兩,兩,添,0,3,.列豎式計(jì)算。,,50.4÷0.28,=,39÷0.13,=,180,300,4,.下面的計(jì)算對嗎?若不對,請改正。,,易錯(cuò),點(diǎn),,辨析:被除數(shù)位數(shù)不夠忘記添,0,補(bǔ)足,,提升點(diǎn),1,,商與被除數(shù)的大小關(guān)系,4,5.6,14,6,15,30,小于,等于,大于,6,.一幢高,78,米的樓房,一樓的層高是,4.5,米,其余每層的高度是,3.5,米,這幢樓共有幾層?,(78,-,4.5)÷3.5,=,21(,層,),,21,+,1,=,22(,層,),,答:這幢樓共有,22,層。,,提升點(diǎn),2,,運(yùn)用小數(shù)除法解決實(shí)際問題,7,.李叔叔從家乘出租車到火車站,共付車費(fèi),18.2,元。李叔叔家到火車站的距離最遠(yuǎn)是多少千米?,(18.2,-,5)÷1.65,+,2.5,=,10.5(km),,答:李叔叔家到火車站的距離最遠(yuǎn)是,10.5 km,。,