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1、小數(shù)乘法練習題小數(shù)乘整數(shù)別忘了在積里點上小數(shù)點喲!一、填空。??26.4×4=(???)+(???)+(????)+(???)?2、把3.67擴大10倍是(????),擴大100倍是(?????),擴大1000倍是(??????)。?3、把560縮小10倍是(?????),縮小100倍是(?????),縮小1000倍是(??????)。二、計算1、直接寫出得數(shù)???6.5×10=????????????0.56×100=?????????3.78×100=???3.215×100=?????????0.8×10=???????????4.08×100=2、用豎式計算??4.6×6=???
2、????????8.9×7=?????????????15.6×13=??0.18×15=????????0.025×14=???????????3.06×36=三、根據(jù)13×3=39,很快說出下面各題的積。???????????130×3=?????13×30=??????1.3×3=???????????1300×3=?????130×30=????0.13×3=???????????1、不計算,在?????里填上>、<或=???????????198×0.8?????198???????????95×0.9???????95???????????168×1.5?????168???
3、????????132×4.6??????132??????????????????????小數(shù)乘小數(shù)?????????????????????????數(shù)小數(shù)位數(shù)時一定要仔細喲!???????????一、填空???????????1、6.3×16.789的積里有(??)位小數(shù)。???????????2、根據(jù)47×14=658,直接寫出下面各題的積。???????????0.47×14=??????????4.7×14=???????????0.47×1.4=???????????47×0.14=??????????0.47×0.14=?????????470×0.014=????????
4、???3、在?????里填上>、<或=7???????????196×0.8?????196??????????35×2.5??????35????????????????0.78×1.1?????0.78??????????6.2×0.99????6.2??????????????若A×0.56>0.56,則A?????1。???????????若B×0.42<0.42,則B?????1。???????????二、判斷題(對的打√,錯的打×)???????????乘數(shù)比1小時,積一定小于被乘數(shù)。(????)???????????一個數(shù)的1.5倍一定比原數(shù)大。(????)????????
5、???一個兩位小數(shù)乘一個一位小數(shù),積的小數(shù)位數(shù)最多是三位小數(shù)。(???)???????????4.37×3.8=166.06(?????)???????????列豎式計算小數(shù)乘法時,應把因數(shù)中的小數(shù)點對齊。(?????)???????????三、計算下面各題???????????31.5×24.5?????0.8×0.56????????????4.23×0.028???????????0.63×1.05?????36×0.56??????????0.32×0.2?????????????????????????????1、0.56的十分之五是多少????????????2、1千克面粉可
6、磨面粉0.85千克,53.5千克小麥可磨面粉多少千克????????????3、在里填上適當?shù)臄?shù)字。???????????當A為何值時,下面等式成立:???????????2.6×1.5+A×1.5+0.15×34=76×0.15???????????積的近似數(shù)???????????記得要“四舍”“五入”喲!???????????一、填空:???????????1、6.9628保留整數(shù)是(????);保留到十分位是(???);保留兩位小數(shù)是(????);保留三位小數(shù)是(????)???????????2、求一個小數(shù)的近似數(shù),如果保留三位小數(shù),要看小數(shù)第(?)位。???????????3、
7、4.3×0.83的積是(????),保留兩位小數(shù)后約是(????)。???????????4、一個兩位小數(shù)用四舍五入法保留一位小數(shù)后得到3.0,這個數(shù)最大可能是(????),最小可能是(?????)。???????????二、判斷題。(對的打√,錯的打×)7???????????1、???????近似值4.0和4的大小相等,精確度一樣。(???)???????????2、???????7.995精確到百分位是8。(???)?????