口算
14×3=35×2=70×60=130×3=
140×3=18×5=12×50=200×30=

解:
14×3=4235×2=7070×60=4200130×3=390
140×3=42018×5=9012×50=600200×30=6000

分析:依據(jù)整數(shù)乘法的計(jì)算方法,計(jì)算即可.
點(diǎn)評:此題主要考查整數(shù)乘法的計(jì)算方法,要注意能簡便計(jì)算的要靈活選擇簡便計(jì)算.
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