4.32÷8
1.68÷21

解:(1)4.32÷8=0.54,
,
驗(yàn)算:
;

(2)1.68÷21=0.08,

驗(yàn)算:

分析:(1)4除以8不夠除,商的個位用0補(bǔ)足,用43除以8,商的小數(shù)點(diǎn)要與被除數(shù)的小數(shù)點(diǎn)對齊;
(2)1除以21 不夠除,商的個位用0補(bǔ)足,16除以21還不夠除,商的十位用0補(bǔ)足,然后用168初一21即可.
驗(yàn)算時,用求得的商乘除數(shù),看看是否等于被除數(shù)即可.
點(diǎn)評:此題考查了小數(shù)除法的豎式計(jì)算以及用乘法進(jìn)行驗(yàn)算,特別注意小數(shù)點(diǎn)對齊.
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