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1、單擊此處編輯母版標題樣式,單擊此處編輯母版文本樣式,第二級,第三級,第四級,第五級,*,文具店,-Decimal Multiplication,北師大版四年級數(shù)學下冊,教學目標,本節(jié)課我們主要來學習小數(shù)乘法，同學們通過對整數(shù)乘法的復習來探索小數(shù)乘法的計算方法，能夠達到獨立解決有關小數(shù)乘法的實際問題的水平。,2.,一支圓珠筆,2,元，買,4,支要多少錢？,2 4=,2+2+2+2=,1.,oral calculation,254=,12 5=,7 20=,2.5+2=,3002=,2,角,4=,3.6-2.4=,4.7+2.6=,5 1.8=,What information do you kn
2、ow from the ichnography?,Can you ask some,maths,questions?,買,4,塊橡皮需要多少元？,Do you know how to estimate it?,買,4,塊橡皮需要多少元？,方法二,：,方法三：,需要,0.8,元,方法一：,求幾個相同加數(shù)和的簡便運算,.,0.3,3,0.9,0.8,0.4,2,算一算：,0.71=,0.1 5=,0.46=,0.35=,0.024=,0.087=,0.7,0.5,2.4,1.5,0.08,0.56,40.3 =0.3 4,你能,計算,40.3,嗎？與同學交流你的想法。,交換兩個因數(shù)的位置,積不變。
3、,0.1,0.5,1,10,比一,比，誰最快,0.83=,70.5=,1.42=,0.710=,0.065=,40.09=,0.0115=,2.1 4=,2.4,3.5,2.8,7,0.3,0.36,0.15,8.4,How do we multiply a decimal by a whole number?,we should look at the decimal as a whole number,.,1.,每千克蘋果,3.2,元，媽媽買了,3,千克，,一共要用多少元？,解決問題：,2.,小明每小時走,5,千米，,1.5,可以走多少千米？,3.2 3=9.6,(,元,),5 1.5=7.5,(,千米,),
北師大版數(shù)學四年級下冊《文具店》PPT
