小數(shù)加減乘除運(yùn)算方法對(duì)比

1、+-+嗨，我是加號(hào)。在計(jì)算小數(shù)加法運(yùn)算時(shí)，小數(shù)點(diǎn)一定要對(duì)齊喲！ 3.85+ 0.2 4.05 -嗨，我是減號(hào)。我和加法一樣，在計(jì)算小數(shù)減法運(yùn)算時(shí)，小數(shù)點(diǎn)也一定要對(duì)齊喲！ 56.7- 3.98 52.72嗨，我是乘號(hào)。我和加法可不一樣，在計(jì)算小數(shù)乘法運(yùn)算時(shí)，末尾對(duì)齊，小數(shù)點(diǎn)在計(jì)算過(guò)程中沒(méi)有用的。不過(guò)計(jì)算出得數(shù)后，這時(shí)小數(shù)點(diǎn)要發(fā)揮作用了。 0.4 8 3 0.0 6 0.0 2 8 9 83位2位5位嗨，該我出場(chǎng)了。我的計(jì)算方法要與整數(shù)除法看齊。要注意小數(shù)點(diǎn)移動(dòng)的位置。1 4 3 8 5.22 81 0 59 87 07 007 5.運(yùn)算運(yùn)算 對(duì)對(duì) 齊齊小數(shù)點(diǎn)小數(shù)點(diǎn)順序順序加減乘除相同數(shù)位對(duì)齊相同

2、數(shù)位對(duì)齊（小數(shù)點(diǎn)對(duì)齊）（小數(shù)點(diǎn)對(duì)齊）相同數(shù)位對(duì)齊相同數(shù)位對(duì)齊（小數(shù)點(diǎn)對(duì)齊）（小數(shù)點(diǎn)對(duì)齊）末位對(duì)齊末位對(duì)齊商的小數(shù)點(diǎn)與被商的小數(shù)點(diǎn)與被除數(shù)小數(shù)點(diǎn)對(duì)齊除數(shù)小數(shù)點(diǎn)對(duì)齊對(duì)齊對(duì)齊對(duì)齊對(duì)齊不一定不一定對(duì)齊對(duì)齊對(duì)齊對(duì)齊由由低低位位到到高高位位由由低低位位到到高高位位由由低低位位到到高高位位由由高高位位到到低低位位列豎式計(jì)算方法的對(duì)比列豎式計(jì)算方法的對(duì)比3.11+2.22=26-13.7=注意注意:小數(shù)點(diǎn)對(duì)齊小數(shù)點(diǎn)對(duì)齊!4.2+13.6+5.8=12.06-3.25-6.75=3.84=0.315.2=注意注意:末尾對(duì)齊末尾對(duì)齊!6.9700=注意注意:先落先落0再點(diǎn)小數(shù)點(diǎn)再點(diǎn)小數(shù)點(diǎn)!0.125X13.7X84.50.9+5.50.97.3-7.30.113.53=1925=1、先把、先把除數(shù)變成整數(shù)除數(shù)變成整數(shù)；2、被除數(shù)和除數(shù)同時(shí)、被除數(shù)和除數(shù)同時(shí)擴(kuò)大相同的倍數(shù)擴(kuò)大相同的倍數(shù)；3、商的小數(shù)點(diǎn)要與、商的小數(shù)點(diǎn)要與移動(dòng)后的被除數(shù)小數(shù)點(diǎn)對(duì)齊移動(dòng)后的被除數(shù)小數(shù)點(diǎn)對(duì)齊。1、按整數(shù)除法計(jì)算；、按整數(shù)除法計(jì)算；2、商的小數(shù)點(diǎn)與被除數(shù)、商的小數(shù)點(diǎn)與被除數(shù)小數(shù)點(diǎn)對(duì)齊小數(shù)點(diǎn)對(duì)齊；3、除到小數(shù)部分有余數(shù)時(shí)，可、除到小數(shù)部分有余數(shù)時(shí)，可添添0繼續(xù)除繼續(xù)除。4、個(gè)位不夠商、個(gè)位不夠商