專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)(學(xué)生版+解析)_第1頁
專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)(學(xué)生版+解析)_第2頁
專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)(學(xué)生版+解析)_第3頁
專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)(學(xué)生版+解析)_第4頁
專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)(學(xué)生版+解析)_第5頁
已閱讀5頁,還剩39頁未讀, 繼續(xù)免費(fèi)閱讀

下載本文檔

版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)

文檔簡(jiǎn)介

專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)當(dāng)前教育形式,對(duì)于小學(xué)數(shù)學(xué)核心素養(yǎng)能力的培養(yǎng)非常重要,小學(xué)生必需具有以下數(shù)學(xué)核心素養(yǎng)(即教師培養(yǎng)學(xué)生的目標(biāo)和方向):數(shù)學(xué)核心素養(yǎng)會(huì)用數(shù)學(xué)眼光觀察現(xiàn)實(shí)世界抽象能力(包括數(shù)感、量感、符號(hào)意識(shí))、幾何直觀、空間觀念與創(chuàng)新意識(shí)。數(shù)學(xué)眼光提供了觀察、探究世界的新視野,能將實(shí)際情境抽象為數(shù)學(xué)問題,能體會(huì)數(shù)學(xué)知識(shí)的實(shí)際意義。會(huì)用數(shù)學(xué)思維思考現(xiàn)實(shí)世界運(yùn)算能力、推理意識(shí)或推理能力。數(shù)學(xué)為人們提供了理解、解釋現(xiàn)實(shí)世界的思維途徑,在邏輯推理中體會(huì)數(shù)學(xué)的嚴(yán)謹(jǐn)性。會(huì)用數(shù)學(xué)語言表達(dá)現(xiàn)實(shí)世界數(shù)據(jù)意識(shí)或數(shù)據(jù)觀念、模型意識(shí)或模型觀念、應(yīng)用意識(shí)。數(shù)學(xué)建模與數(shù)據(jù)分析可以作為工具廣泛應(yīng)用于其他學(xué)科,體現(xiàn)了數(shù)學(xué)具有應(yīng)用的廣泛性。四基:學(xué)生通過學(xué)習(xí)所獲得的基礎(chǔ)知識(shí)、基本技能、基本思想、基本活動(dòng)經(jīng)驗(yàn)。這些是數(shù)學(xué)學(xué)習(xí)的基礎(chǔ),旨在讓學(xué)生不僅掌握必要的知識(shí)和技能,而且在學(xué)習(xí)過程中積累經(jīng)驗(yàn),形成數(shù)學(xué)思維和處理問題的方法。四能:學(xué)生通過學(xué)習(xí)所獲得的基礎(chǔ)知識(shí)、基本技能、基本思想、基本活動(dòng)經(jīng)驗(yàn)。這些是數(shù)學(xué)學(xué)習(xí)的基礎(chǔ),旨在讓學(xué)生不僅掌握必要的知識(shí)和技能,而且在學(xué)習(xí)過程中積累經(jīng)驗(yàn),形成數(shù)學(xué)思維和處理問題的方法。

一、小數(shù)四則運(yùn)算-豎式計(jì)算1、小數(shù)加法和減法的計(jì)算方法:要把小數(shù)點(diǎn)對(duì)齊,也就是相同數(shù)位對(duì)齊;從最低位算起,各位滿十要進(jìn)一;不夠減時(shí)要向前一位借1當(dāng)10再減。2、被減數(shù)是整數(shù)時(shí),要添上小數(shù)點(diǎn),并根據(jù)減數(shù)的小數(shù)部分補(bǔ)上“0”后再減。3、用豎式計(jì)算小數(shù)加、減法時(shí),小數(shù)點(diǎn)末尾的“0”不能去掉,把結(jié)果寫在橫式中時(shí),小數(shù)點(diǎn)末尾的“0”要去掉。4、小數(shù)乘法的計(jì)算方法:(1)算:先按整數(shù)乘法的法則計(jì)算;(2)看:看兩個(gè)乘數(shù)中一共有幾位小數(shù);(3)數(shù):從積的右邊起數(shù)出幾位(小數(shù)位數(shù)不夠時(shí),要在前面用0補(bǔ)足);(4)點(diǎn):點(diǎn)上小數(shù)點(diǎn);(5)去:去掉小數(shù)末尾的“0”。5、小數(shù)除法的計(jì)算方法:先看除數(shù)是整數(shù)還是小數(shù)。小數(shù)除以整數(shù)計(jì)算方法:(1)按整數(shù)除法的法則計(jì)算;(2)商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊(3)如果有余數(shù),要在余數(shù)后面添“0”繼續(xù)除。除數(shù)是小數(shù)的計(jì)算方法:(1)看:看清除數(shù)有幾位小數(shù)(2)移(商不變規(guī)律):把除數(shù)和被除數(shù)的小數(shù)點(diǎn)同時(shí)向右移動(dòng)相同的位數(shù),使除數(shù)變成整數(shù),當(dāng)被除數(shù)的小數(shù)位數(shù)不足時(shí),用“0”補(bǔ)足.(3)算:按照除數(shù)是整數(shù)的除法計(jì)算。注意:商的小數(shù)點(diǎn)要和被除數(shù)移動(dòng)后的小數(shù)點(diǎn)對(duì)齊).一、計(jì)算題1.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算。6.29÷8.5=

0.35+16.55=

0.27×3.24≈(得數(shù)保留兩位小數(shù))2.(23-24五年級(jí)上·江蘇鎮(zhèn)江·期末)用豎式計(jì)算?!編?的題要驗(yàn)算】*0.78+12.6

2.8×3.07(得數(shù)保留兩位小數(shù))

*16.36÷0.43.(23-24五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算。(打“★”的得數(shù)保留兩位小數(shù))26.4-3.94=

0.75×10.42=

★4.92÷1.9≈4.(23-24五年級(jí)上·江蘇南通·期末)用豎式計(jì)算。4.8-4.38=

4.02×5.6=

231.8÷0.38=5.(23-24五年級(jí)上·江蘇南京·期末)用豎式計(jì)算,帶★的要驗(yàn)算。9.3-5.46=

1.08÷12=

0.56×9.28≈(得數(shù)保留兩位小數(shù))

★6.97÷3.4=6.(22-23五年級(jí)上·江蘇徐州·期末)列豎式計(jì)算。(帶☆的得數(shù)精確到百分位)3.56×1.2=

☆16÷22=

12.98÷0.8=7.(22-23五年級(jí)上·江蘇南通·期末)用豎式計(jì)算,帶※的要驗(yàn)算?!?/p>

8.(22-23五年級(jí)上·湖北荊門·期末)列豎式計(jì)算。56.5×0.24=

93.6÷0.052=

3.12÷2.6=

0.47÷0.6≈(保留兩位小數(shù))9.(22-23五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算。17.8+5.02=

3.5×0.36=

16÷23≈(保留兩位小數(shù))10.(23-24五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。(帶*的要驗(yàn)算)*10.3-2.78=

0.35×0.26=

9.26÷2.8≈

(得數(shù)保留兩位小數(shù))11.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)列豎式計(jì)算。(帶*的題要寫出驗(yàn)算過程。)15.6-7.64=

0.651÷4.2=

8.5×1.23≈(精確到十分位)12.(22-23五年級(jí)上·江蘇宿遷·期末)列豎式計(jì)算。8.84+1.16=

2.05×2.4=

0.988÷0.13=13.(22-23五年級(jí)上·河南南陽·期中)用豎式計(jì)算。42.3×0.78=

7.8÷0.75=5.87÷1.9≈(得數(shù)保留兩位小數(shù))

4÷15=(用循環(huán)小數(shù)表示結(jié)果)14.(22-23五年級(jí)上·江蘇南通·期末)列豎式計(jì)算。3.48+6.52=

4.05×7.2=

9.67-6.7=

2.4÷0.16=15.(22-23五年級(jí)上·江蘇南通·期末)豎式計(jì)算(帶“*”的要驗(yàn)算)。7.2×1.85=

2.63+0.78=

*7-2.38=

*5.76÷3.2=16.(22-23五年級(jí)上·江蘇常州·期末)用豎式計(jì)算。(帶☆題要驗(yàn)算,最后一題得數(shù)保留兩位小數(shù))4.3-2.14=

☆1.8÷0.24=

16.4×0.47≈17.(22-23五年級(jí)上·江蘇常州·期末)列豎式計(jì)算。(帶*的得數(shù)保留兩位小數(shù))6.4×0.29=

34.72÷5.6=

*53.5÷0.85≈18.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算,標(biāo)*的題需驗(yàn)算。80.91=

*0.672÷4.2=19.(22-23五年級(jí)上·江蘇鎮(zhèn)江·期末)帶*題用豎式計(jì)算并驗(yàn)算,不帶*題得數(shù)保留兩位小數(shù)。*29.37-8.2

*0.54÷0.36

0.34×6.9

0.682÷0.2620.(22-23五年級(jí)上·江蘇鎮(zhèn)江·期末)列豎式計(jì)算(打*的要驗(yàn)算)。①

③*21.(23-24五年級(jí)上·江蘇鹽城·期末)豎式計(jì)算。8-5.08=

1.02×0.75=

27.9÷2.8≈(得數(shù)保留一位小數(shù))22.(22-23五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算(帶★的題要求驗(yàn)算)10.4-6.58=

★107.1÷35=

6.8×0.78≈(精確到十分位)

4.3÷0.15≈(保留兩位小數(shù))23.(22-23五年級(jí)上·江蘇宿遷·期末)豎式計(jì)算。(加★的保留兩位小數(shù))35.9+8.2=

9.46×0.85=

0.736÷23=

★3.42÷3.3≈24.(22-23五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。3.81+0.69=

12.9-5.01=

43.68÷26=

8.05×13≈(保留整數(shù))25.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算。

26.(22-23五年級(jí)上·江蘇徐州·期末)列豎式計(jì)算。9.57+1.5=

0.18-0.125=

98×0.05=

0.453÷0.15=27.(23-24五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。(帶*的要驗(yàn)算)58.6÷11≈(保留兩位小數(shù))

15.203-9.27=

*4.38×0.37=28.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算,帶☆的題要驗(yàn)算。20.3-7.58=

☆0.84×6.5=

2.7÷0.46≈(得數(shù)保留兩位小數(shù))29.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算。①17.5-6.27=

②7.5×0.24=

③78.5÷13≈(得數(shù)保留兩位小數(shù))30.(22-23五年級(jí)上·江蘇連云港·期末)列豎式計(jì)算,并在草稿紙上驗(yàn)算。0.63+3.7

8.36-7.4

0.82×29

0.756÷0.1831.(22-23五年級(jí)上·江蘇南京·期末)用豎式計(jì)算,帶*的得數(shù)保留兩位小數(shù)。4.35+5.58=

7.09-2.39=

*0.37×4.8≈

*2.5÷0.45≈32.(24-25五年級(jí)上·江蘇·期末)用豎式計(jì)算。2.58+3.47=

6.2-4.95=

7.5×0.24=

5.25÷3.5=33.(23-24五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算。(帶★要驗(yàn)算)12.4+0.56=

11.8-4.51=

★3.84÷1.2=

2.05×0.67≈(得數(shù)保留一位小數(shù))34.(22-23五年級(jí)上·江蘇淮安·期末)用豎式計(jì)算,帶*的題要驗(yàn)算。

(得數(shù)保留兩位小數(shù))35.(23-24五年級(jí)上·江蘇鹽城·期末)列豎式計(jì)算。(除不盡的保留兩位小數(shù))(1)2.15×3.6

(2)71÷1536.(23-24五年級(jí)上·江蘇南京·期末)用豎式計(jì)算下面各題,加“★”的得數(shù)保留兩位小數(shù)。

★37.(23-24五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算(帶*的要驗(yàn)算)。9.6÷0.35≈(商保留一位小數(shù))

*8-6.27=5.89×3.6≈(精確到百分位)

*22.68+9.42=38.(23-24五年級(jí)上·江蘇常州·期末)豎式計(jì)算。9.06-1.29(驗(yàn)算)

(得數(shù)保留兩位小數(shù))39.(23-24五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算,帶*的題要驗(yàn)算。6.08-0.125=

*9.24×3.5=

0.783÷0.14≈

(得數(shù)保留一位小數(shù))40.(23-24五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算。(帶“☆”號(hào)的要驗(yàn)算)4.02+1.88=

9-5.46=

2.8×0.29≈(積保留兩位小數(shù))

☆12.36÷1.2=專題04(小數(shù)四則運(yùn)算-豎式計(jì)算)-2024-2025學(xué)年五年級(jí)數(shù)學(xué)上學(xué)期期末備考真題分類匯編(江蘇專版)當(dāng)前教育形式,對(duì)于小學(xué)數(shù)學(xué)核心素養(yǎng)能力的培養(yǎng)非常重要,小學(xué)生必需具有以下數(shù)學(xué)核心素養(yǎng)(即教師培養(yǎng)學(xué)生的目標(biāo)和方向):數(shù)學(xué)核心素養(yǎng)會(huì)用數(shù)學(xué)眼光觀察現(xiàn)實(shí)世界抽象能力(包括數(shù)感、量感、符號(hào)意識(shí))、幾何直觀、空間觀念與創(chuàng)新意識(shí)。數(shù)學(xué)眼光提供了觀察、探究世界的新視野,能將實(shí)際情境抽象為數(shù)學(xué)問題,能體會(huì)數(shù)學(xué)知識(shí)的實(shí)際意義。會(huì)用數(shù)學(xué)思維思考現(xiàn)實(shí)世界運(yùn)算能力、推理意識(shí)或推理能力。數(shù)學(xué)為人們提供了理解、解釋現(xiàn)實(shí)世界的思維途徑,在邏輯推理中體會(huì)數(shù)學(xué)的嚴(yán)謹(jǐn)性。會(huì)用數(shù)學(xué)語言表達(dá)現(xiàn)實(shí)世界數(shù)據(jù)意識(shí)或數(shù)據(jù)觀念、模型意識(shí)或模型觀念、應(yīng)用意識(shí)。數(shù)學(xué)建模與數(shù)據(jù)分析可以作為工具廣泛應(yīng)用于其他學(xué)科,體現(xiàn)了數(shù)學(xué)具有應(yīng)用的廣泛性。四基:學(xué)生通過學(xué)習(xí)所獲得的基礎(chǔ)知識(shí)、基本技能、基本思想、基本活動(dòng)經(jīng)驗(yàn)。這些是數(shù)學(xué)學(xué)習(xí)的基礎(chǔ),旨在讓學(xué)生不僅掌握必要的知識(shí)和技能,而且在學(xué)習(xí)過程中積累經(jīng)驗(yàn),形成數(shù)學(xué)思維和處理問題的方法。四能:學(xué)生通過學(xué)習(xí)所獲得的基礎(chǔ)知識(shí)、基本技能、基本思想、基本活動(dòng)經(jīng)驗(yàn)。這些是數(shù)學(xué)學(xué)習(xí)的基礎(chǔ),旨在讓學(xué)生不僅掌握必要的知識(shí)和技能,而且在學(xué)習(xí)過程中積累經(jīng)驗(yàn),形成數(shù)學(xué)思維和處理問題的方法。

一、小數(shù)四則運(yùn)算-豎式計(jì)算1、小數(shù)加法和減法的計(jì)算方法:要把小數(shù)點(diǎn)對(duì)齊,也就是相同數(shù)位對(duì)齊;從最低位算起,各位滿十要進(jìn)一;不夠減時(shí)要向前一位借1當(dāng)10再減。2、被減數(shù)是整數(shù)時(shí),要添上小數(shù)點(diǎn),并根據(jù)減數(shù)的小數(shù)部分補(bǔ)上“0”后再減。3、用豎式計(jì)算小數(shù)加、減法時(shí),小數(shù)點(diǎn)末尾的“0”不能去掉,把結(jié)果寫在橫式中時(shí),小數(shù)點(diǎn)末尾的“0”要去掉。4、小數(shù)乘法的計(jì)算方法:(1)算:先按整數(shù)乘法的法則計(jì)算;(2)看:看兩個(gè)乘數(shù)中一共有幾位小數(shù);(3)數(shù):從積的右邊起數(shù)出幾位(小數(shù)位數(shù)不夠時(shí),要在前面用0補(bǔ)足);(4)點(diǎn):點(diǎn)上小數(shù)點(diǎn);(5)去:去掉小數(shù)末尾的“0”。5、小數(shù)除法的計(jì)算方法:先看除數(shù)是整數(shù)還是小數(shù)。小數(shù)除以整數(shù)計(jì)算方法:(1)按整數(shù)除法的法則計(jì)算;(2)商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊(3)如果有余數(shù),要在余數(shù)后面添“0”繼續(xù)除。除數(shù)是小數(shù)的計(jì)算方法:(1)看:看清除數(shù)有幾位小數(shù)(2)移(商不變規(guī)律):把除數(shù)和被除數(shù)的小數(shù)點(diǎn)同時(shí)向右移動(dòng)相同的位數(shù),使除數(shù)變成整數(shù),當(dāng)被除數(shù)的小數(shù)位數(shù)不足時(shí),用“0”補(bǔ)足.(3)算:按照除數(shù)是整數(shù)的除法計(jì)算。注意:商的小數(shù)點(diǎn)要和被除數(shù)移動(dòng)后的小數(shù)點(diǎn)對(duì)齊).一、計(jì)算題1.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算。6.29÷8.5=

0.35+16.55=

0.27×3.24≈(得數(shù)保留兩位小數(shù))【答案】0.74;16.9;0.87【分析】(1)小數(shù)除以小數(shù)的除法:先將除數(shù)和被除數(shù)擴(kuò)大相同的倍數(shù),使除數(shù)變成整數(shù),再按照除數(shù)是整數(shù)的除法計(jì)算,即按照整數(shù)除法的計(jì)算方法計(jì)算,除到哪一位商就上再哪一位的上面,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊。整數(shù)部分不夠除,商寫0,點(diǎn)上小數(shù)點(diǎn)。如果有余數(shù),要添0繼續(xù)除。(2)小數(shù)的加法:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從低位算起按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊。最后要注意將小數(shù)的末尾的0去掉。(3)小數(shù)的乘法:首先末尾對(duì)齊,將小數(shù)乘法看成整數(shù)乘法,按照整數(shù)乘法的計(jì)算方法計(jì)算,再看因數(shù)中一共有幾位小數(shù),就從得數(shù)的右邊起數(shù)出幾位小數(shù),點(diǎn)上小數(shù)點(diǎn),得數(shù)的小數(shù)部分末尾有0的一般要把0去掉。最后的積保留是兩位小數(shù),則要看積的第三位,再根據(jù)“四舍五入”的方法取近似值?!驹斀狻?.29÷8.5=0.74

0.35+16.55=16.9

0.27×3.24≈0.872.(23-24五年級(jí)上·江蘇鎮(zhèn)江·期末)用豎式計(jì)算。【帶*的題要驗(yàn)算】*0.78+12.6

2.8×3.07(得數(shù)保留兩位小數(shù))

*16.36÷0.4【答案】13.38;8.60;40.9【分析】小數(shù)的加法和減法的法則:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從低位算起,然后按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)要和上面的小數(shù)點(diǎn)對(duì)齊。小數(shù)加法驗(yàn)算時(shí),根據(jù)加法和減法互為逆運(yùn)算的關(guān)系,用和減去一個(gè)加數(shù),如果所得的差與另一個(gè)加數(shù)相同,那么原計(jì)算正確。小數(shù)乘法法則:按整數(shù)乘法的法則先求出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。積保留幾位小數(shù),就看它的下一位,用“四舍五入法”取值。計(jì)算除數(shù)是小數(shù)的除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。小數(shù)除法驗(yàn)算時(shí),根據(jù)乘法和除法互為逆運(yùn)算的關(guān)系,把除數(shù)和商相乘,如果乘得的積與被除數(shù)相同,那么原計(jì)算正確?!驹斀狻?.78+12.6=13.38

2.8×3.07≈8.60

驗(yàn)算:

16.36÷0.4=40.9驗(yàn)算:3.(23-24五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算。(打“★”的得數(shù)保留兩位小數(shù))26.4-3.94=

0.75×10.42=

★4.92÷1.9≈【答案】22.46;7.815;2.59【分析】小數(shù)減法:小數(shù)點(diǎn)對(duì)齊,末位減起。不夠減時(shí),向前借一再減;小數(shù)乘法:先按照整數(shù)乘法求出積,再點(diǎn)小數(shù)點(diǎn)。乘數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);除數(shù)是小數(shù)的小數(shù)除法:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也要向右移動(dòng)幾位,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算。要求得數(shù)保留兩位小數(shù)的,看第三位小數(shù)的大小,然后按照“四舍五入”法求出近似數(shù)。【詳解】26.4-3.94=22.46

0.75×10.42=7.815

4.92÷1.9≈2.59

4.(23-24五年級(jí)上·江蘇南通·期末)用豎式計(jì)算。4.8-4.38=

4.02×5.6=

231.8÷0.38=【答案】0.42;22.512;610【分析】小數(shù)的加法和減法的法則:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從低位算起,然后按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)要和上面的小數(shù)點(diǎn)對(duì)齊。小數(shù)乘法法則:按整數(shù)乘法的法則先求出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。計(jì)算除數(shù)是小數(shù)的除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算?!驹斀狻?.8-4.38=0.42

4.02×5.6=22.512

231.8÷0.38=610

5.(23-24五年級(jí)上·江蘇南京·期末)用豎式計(jì)算,帶★的要驗(yàn)算。9.3-5.46=

1.08÷12=

0.56×9.28≈(得數(shù)保留兩位小數(shù))

★6.97÷3.4=【答案】3.84;0.09;5.20;2.05【分析】(1)計(jì)算小數(shù)減法,先把兩數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊),再按照整數(shù)減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)。(2)除數(shù)是整數(shù)的小數(shù)除法,按照整數(shù)的除法法則去除,如果小數(shù)的整數(shù)部分不夠商1,就在個(gè)位上商0,商的小數(shù)點(diǎn)要與被除數(shù)的小數(shù)點(diǎn)對(duì)齊,如果除到被除數(shù)的末尾仍有余數(shù),就在余數(shù)后面補(bǔ)零,再繼續(xù)除。(3)計(jì)算小數(shù)乘法,先按整數(shù)乘法的法則先求出積,看因數(shù)中一個(gè)有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。積保留兩位小數(shù)時(shí),看小數(shù)點(diǎn)后面第三位,再根據(jù)四舍五入取近似值。(4)計(jì)算除數(shù)是小數(shù)的除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。驗(yàn)算時(shí)用商和除數(shù)相乘,看結(jié)果是否等于被除數(shù)?!驹斀狻?.3-5.46=3.84

1.08÷12=0.09

0.56×9.28≈5.20(得數(shù)保留兩位小數(shù))

★6.97÷3.4=2.05驗(yàn)算:6.(22-23五年級(jí)上·江蘇徐州·期末)列豎式計(jì)算。(帶☆的得數(shù)精確到百分位)3.56×1.2=

☆16÷22=

12.98÷0.8=【答案】4.272;0.73;16.225【分析】(1)小數(shù)乘法計(jì)算方法:先把因數(shù)看成整數(shù),再看因數(shù)一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。運(yùn)用四舍五入法精確到百分位。(2)根據(jù)小數(shù)除法的計(jì)算法則,進(jìn)行計(jì)算即可,精確到百分位,要計(jì)算到千分位,再根據(jù)“四舍五入”的方法,進(jìn)行保留即可。(3)除數(shù)是小數(shù)的除法,先把除數(shù)轉(zhuǎn)化成整數(shù),被除數(shù)擴(kuò)大相應(yīng)的倍數(shù),再按照除數(shù)是整數(shù)的計(jì)算方法計(jì)算即可?!驹斀狻?.56×1.2=4.272

☆16÷22≈0.73

12.98÷0.8=16.225

7.(22-23五年級(jí)上·江蘇南通·期末)用豎式計(jì)算,帶※的要驗(yàn)算?!?/p>

【答案】2.32;22.3;20.52【分析】小數(shù)加減法的計(jì)算法則是:把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊),再按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)。(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉);小數(shù)的加減法驗(yàn)算方法與整數(shù)加減法驗(yàn)算方法相同;加法可以用交換加數(shù)的位置和不變,或和-加數(shù)=另一個(gè)加數(shù)的方法驗(yàn)算;減法可以用被減數(shù)-差=減數(shù),或減數(shù)+差=被減數(shù)的方法驗(yàn)算,據(jù)此判斷。【詳解】驗(yàn)算:驗(yàn)算:8.(22-23五年級(jí)上·湖北荊門·期末)列豎式計(jì)算。56.5×0.24=

93.6÷0.052=

3.12÷2.6=

0.47÷0.6≈(保留兩位小數(shù))【答案】13.56;1800;1.2;0.78【分析】小數(shù)乘法的計(jì)算法則,小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位;除數(shù)是小數(shù)的小數(shù)除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足);然后按除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算;被除數(shù)的數(shù)用完時(shí),在被除數(shù)的末尾添“0”繼續(xù)除;保留兩位小數(shù)就是精確到百分位,要看千分位上的數(shù)字是幾,然后根據(jù)四舍五入的方法取近似值?!驹斀狻?6.5×0.24=13.56

93.6÷0.052=1800

3.12÷2.6=1.2

0.47÷0.6≈0.78(保留兩位小數(shù))

9.(22-23五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算。17.8+5.02=

3.5×0.36=

16÷23≈(保留兩位小數(shù))【答案】22.82;1.26;0.70【分析】根據(jù)小數(shù)四則計(jì)算法則列豎式計(jì)算,注意積末尾的應(yīng)當(dāng)去掉,除法中先商到千分位,再按四舍五入法保留兩位小數(shù)?!驹斀狻?7.8+5.02=22.82

3.5×0.36=

16÷23≈(保留兩位小數(shù))10.(23-24五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。(帶*的要驗(yàn)算)*10.3-2.78=

0.35×0.26=

9.26÷2.8≈

(得數(shù)保留兩位小數(shù))【答案】7.52;0.091;3.31【分析】小數(shù)減法的計(jì)算法則:先把小數(shù)點(diǎn)對(duì)齊(也就是把相同的數(shù)位上的數(shù)對(duì)齊),再按照整數(shù)減法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)位置,點(diǎn)上小數(shù)點(diǎn);驗(yàn)算減法可以用加法。小數(shù)乘法的計(jì)算法則:小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位。除數(shù)是小數(shù)的小數(shù)除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足);然后按除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算。除不盡時(shí),要求得數(shù)保留幾位小數(shù),要除到它的下一位,再用四舍五入的方法取商的近似數(shù)?!驹斀狻?10.3-2.78=7.520.35×0.26=0.0919.26÷2.8≈3.31驗(yàn)算:

11.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)列豎式計(jì)算。(帶*的題要寫出驗(yàn)算過程。)15.6-7.64=

0.651÷4.2=

8.5×1.23≈(精確到十分位)【答案】7.96;0.155;10.5【分析】根據(jù)小數(shù)減法和乘除法的計(jì)算方法進(jìn)行計(jì)算,注意根據(jù)四舍五入法保留相應(yīng)的小數(shù)位數(shù)。計(jì)算小數(shù)加減法時(shí),相同數(shù)位要對(duì)齊,小數(shù)點(diǎn)對(duì)齊,計(jì)算小數(shù)乘法時(shí),先按照整數(shù)乘法的計(jì)算方法進(jìn)行計(jì)算,再數(shù)出一共有幾位小數(shù),在積中數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)即可。據(jù)此判斷即可;除數(shù)是小數(shù)的小數(shù)除法法則:先看除數(shù)中有幾位小數(shù),就把被除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,數(shù)位不夠的用零補(bǔ)足;然后按照除數(shù)是整數(shù)的小數(shù)除法來除:商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊;如果除到被除數(shù)的末尾仍有余數(shù),添0繼續(xù)除;【詳解】15.6-7.64=7.96

0.651÷4.2=0.155

8.5×1.23≈10.5

12.(22-23五年級(jí)上·江蘇宿遷·期末)列豎式計(jì)算。8.84+1.16=

2.05×2.4=

0.988÷0.13=【答案】10;4.92;7.6【分析】8.84+1.16,是小數(shù)加法,小數(shù)加減法的計(jì)算法則:1、計(jì)算小數(shù)加、減法,先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)擠)。2、再按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)(得數(shù)的小數(shù)部分末尾有0,-般要把0去掉)。2.05×2.4是小數(shù)乘法,小數(shù)的乘法計(jì)算法則:先按照整數(shù)乘法的計(jì)算法則算出積,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果位數(shù)不夠,就用0補(bǔ)足。0.988÷0.13是小數(shù)除法計(jì)算,小數(shù)的除法計(jì)算法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù),被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的補(bǔ)0),然后按照除數(shù)是整數(shù)的除法法則進(jìn)行計(jì)算?!驹斀狻?.84+1.16=10

2.05×2.4=4.92

0.988÷0.13=7.613.(22-23五年級(jí)上·河南南陽·期中)用豎式計(jì)算。42.3×0.78=

7.8÷0.75=5.87÷1.9≈(得數(shù)保留兩位小數(shù))

4÷15=(用循環(huán)小數(shù)表示結(jié)果)【答案】32.994;10.4;3.09;【分析】(1)計(jì)算小數(shù)乘法時(shí),先按照整數(shù)乘法計(jì)算出積,再點(diǎn)小數(shù)點(diǎn),看因數(shù)中一共有幾位小數(shù)就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn),位數(shù)不夠時(shí)用0補(bǔ)足,小數(shù)部分末尾的0要去掉;(2)計(jì)算除數(shù)是小數(shù)的小數(shù)除法時(shí),先移動(dòng)除數(shù)的小數(shù)點(diǎn)使它變成整數(shù),除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)末尾用0補(bǔ)足),然后按照除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算,商保留兩位小數(shù)時(shí),要除到小數(shù)點(diǎn)后面第三位,再根據(jù)四舍五入取近似值;(3)一個(gè)循環(huán)小數(shù)的小數(shù)部分,依次不斷重復(fù)出現(xiàn)的數(shù)字,就是這個(gè)循環(huán)小數(shù)的循環(huán)節(jié),寫循環(huán)小數(shù)時(shí),可以只寫第一個(gè)循環(huán)節(jié),并在這個(gè)循環(huán)節(jié)的首位和末位數(shù)字上面各記一個(gè)圓點(diǎn),據(jù)此解答。【詳解】42.3×0.78=32.994

7.8÷0.75=10.4

5.87÷1.9≈3.09(得數(shù)保留兩位小數(shù))

4÷15=(用循環(huán)小數(shù)表示結(jié)果)

14.(22-23五年級(jí)上·江蘇南通·期末)列豎式計(jì)算。3.48+6.52=

4.05×7.2=

9.67-6.7=

2.4÷0.16=【答案】10;29.16;2.97;15【分析】小數(shù)的加法和減法的法則:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從低位算起,按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊;小數(shù)乘法法則:按整數(shù)乘法的法則先求出積;看因數(shù)中一個(gè)有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。小數(shù)除法法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算?!驹斀狻?.48+6.52=10

4.05×7.2=29.16

9.67-6.7=2.97

2.4÷0.16=15

15.(22-23五年級(jí)上·江蘇南通·期末)豎式計(jì)算(帶“*”的要驗(yàn)算)。7.2×1.85=

2.63+0.78=

*7-2.38=

*5.76÷3.2=【答案】13.32;3.41;4.62;1.8【分析】小數(shù)乘法法則:(1)按整數(shù)乘法的法則先求出積;(2)看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。小數(shù)的加法和減法的法則:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊);從低位算起;按整數(shù)加減法的法則進(jìn)行計(jì)算;結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊。小數(shù)除法法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。根據(jù)被減數(shù)=差+減數(shù),被除數(shù)=商×除數(shù),進(jìn)行驗(yàn)算。【詳解】7.2×1.85=13.32

2.63+0.78=3.41

*7-2.38=4.62

*5.76÷3.2=1.8驗(yàn)算:

驗(yàn)算:16.(22-23五年級(jí)上·江蘇常州·期末)用豎式計(jì)算。(帶☆題要驗(yàn)算,最后一題得數(shù)保留兩位小數(shù))4.3-2.14=

☆1.8÷0.24=

16.4×0.47≈【答案】2.16;7.5;7.71【分析】小數(shù)加減法:小數(shù)點(diǎn)對(duì)齊,也就是相同數(shù)位對(duì)齊,計(jì)算時(shí),按照整數(shù)加減法的計(jì)算方法進(jìn)行計(jì)算,得數(shù)中的小數(shù)點(diǎn)要與豎式中的小數(shù)點(diǎn)對(duì)齊;除數(shù)是小數(shù)的小數(shù)除法:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足);然后按除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算;被除數(shù)的數(shù)用完時(shí),在被除數(shù)的末尾添“0”繼續(xù)除;根據(jù)被除數(shù)=除數(shù)×商進(jìn)行驗(yàn)算即可;小數(shù)乘法:小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位。保留兩位小數(shù)就是精確到百分位,要看千分位上的數(shù)字是幾,然后根據(jù)四舍五入的方法取近似值。【詳解】4.3-2.14=2.16

☆1.8÷0.24=7.5

16.4×0.47≈7.71驗(yàn)算:17.(22-23五年級(jí)上·江蘇常州·期末)列豎式計(jì)算。(帶*的得數(shù)保留兩位小數(shù))6.4×0.29=

34.72÷5.6=

*53.5÷0.85≈【答案】1.856;6.2;62.94【分析】(1)先按照整數(shù)乘法的法則算出積,再看兩個(gè)乘數(shù)中一共有幾位小數(shù),就從右邊起數(shù)出幾位小數(shù),點(diǎn)上小數(shù)點(diǎn)即可;(2)先把除數(shù)的小數(shù)點(diǎn)去掉使它變成整數(shù),再按照整數(shù)除法的方法去除,最后商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊;(3)先把除數(shù)的小數(shù)點(diǎn)去掉使它變成整數(shù),再按照整數(shù)除法的方法去除,最后商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊?!驹斀狻?.4×0.29=1.856

34.72÷5.6=6.2

53.5÷0.85≈62.94

18.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算,標(biāo)*的題需驗(yàn)算。80.91=

*0.672÷4.2=【答案】7.09;0.16【分析】(1)先根據(jù)小數(shù)后的位數(shù)在整數(shù)后加小數(shù)點(diǎn)以及相應(yīng)的補(bǔ)0,然后根據(jù)減法法則進(jìn)行相減借位計(jì)算。(2)先把除數(shù)變成整數(shù),除數(shù)擴(kuò)大到原來的幾倍,被除數(shù)也要擴(kuò)大到原來的幾倍,然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算即可,最后商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊?!驹斀狻?-0.91=7.09

0.672÷4.2=0.16

驗(yàn)算:19.(22-23五年級(jí)上·江蘇鎮(zhèn)江·期末)帶*題用豎式計(jì)算并驗(yàn)算,不帶*題得數(shù)保留兩位小數(shù)。*29.37-8.2

*0.54÷0.36

0.34×6.9

0.682÷0.26【答案】21.17;1.5;2.35;2.62【分析】小數(shù)的加法和減法的法則:(1)相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊);(2)從低位算起;(3)按整數(shù)加減法的法則進(jìn)行計(jì)算;(4)結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊。小數(shù)除法法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。小數(shù)乘法法則:(1)按整數(shù)乘法的法則先求出積;(2)看因數(shù)中一個(gè)有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。根據(jù)差+減數(shù)=被減數(shù),商×除數(shù)=被除數(shù),進(jìn)行驗(yàn)算;根據(jù)四舍五入法保留近似數(shù)即可?!驹斀狻?29.37-8.2=21.17

*0.54÷0.36=1.5

驗(yàn)算:驗(yàn)算:

0.34×6.9≈2.35

0.682÷0.26≈2.6220.(22-23五年級(jí)上·江蘇鎮(zhèn)江·期末)列豎式計(jì)算(打*的要驗(yàn)算)。①

③*【答案】①0.882;②2.96;③0.8【分析】小數(shù)加減法法則:先把各數(shù)的小數(shù)點(diǎn)對(duì)齊,再按照整數(shù)的法則計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn);小數(shù)乘法法則:先按照整數(shù)乘法的計(jì)算法則算出積,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果位數(shù)不夠,就用“0”補(bǔ)足;除數(shù)是小數(shù)的除法計(jì)算法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù),被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法法則進(jìn)行計(jì)算;除法的驗(yàn)算用乘法?!驹斀狻竣?.36×2.45=0.882

②5.79-2.83=2.96

③0.256÷0.32=0.8

驗(yàn)算:21.(23-24五年級(jí)上·江蘇鹽城·期末)豎式計(jì)算。8-5.08=

1.02×0.75=

27.9÷2.8≈(得數(shù)保留一位小數(shù))【答案】2.92;0.765;10.0【分析】計(jì)算小數(shù)減法:先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊)﹔在按照整數(shù)減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn),點(diǎn)上小數(shù)點(diǎn)(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉)。小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位;除數(shù)是小數(shù)的除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù),位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足,然后按照除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算;根據(jù)“四舍五入”法求商的近似數(shù),找到要求保留的數(shù)位,看下一位;如果下一位的數(shù)字大于或等于5,要往前進(jìn)一;如果下一位的數(shù)字小于5,要舍去。據(jù)此解答?!驹斀狻?-5.08=2.92

1.02×0.75=0.765

27.9÷2.8≈10.0

22.(22-23五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算(帶★的題要求驗(yàn)算)10.4-6.58=

★107.1÷35=

6.8×0.78≈(精確到十分位)

4.3÷0.15≈(保留兩位小數(shù))【答案】3.82;3.06;5.3;28.67【分析】小數(shù)加減法:小數(shù)點(diǎn)對(duì)齊,也就是相同數(shù)位對(duì)齊,計(jì)算時(shí),按照整數(shù)加減法的計(jì)算方法進(jìn)行計(jì)算,得數(shù)中的小數(shù)點(diǎn)要與豎式中的小數(shù)點(diǎn)對(duì)齊;小數(shù)乘法:小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位。除數(shù)是整數(shù)的小數(shù)除法:按照整數(shù)除法的法則進(jìn)行計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊,如果除到被除數(shù)的末尾仍有余數(shù),就在余數(shù)后面添0再繼續(xù)除;然后根據(jù)被除數(shù)=商×除數(shù)進(jìn)行驗(yàn)算即可。除數(shù)是小數(shù)的小數(shù)除法:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足);然后按除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算;被除數(shù)的數(shù)用完時(shí),在被除數(shù)的末尾添“0”繼續(xù)除;精確到十分位,要看百分位上的數(shù)字是幾,然后根據(jù)四舍五入的方法取近似值;保留兩位小數(shù)就是精確到百分位,要看千分位上的數(shù)字是幾,然后根據(jù)四舍五入的方法取近似值。【詳解】10.4-6.58=3.82

★107.1÷35=3.06

驗(yàn)算:6.8×0.78≈5.3

4.3÷0.15≈28.67

23.(22-23五年級(jí)上·江蘇宿遷·期末)豎式計(jì)算。(加★的保留兩位小數(shù))35.9+8.2=

9.46×0.85=

0.736÷23=

★3.42÷3.3≈【答案】44.1;8.041;0.032;1.04【分析】小數(shù)加法豎式:先把相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從末位開始算起,與整數(shù)加法豎式計(jì)算方法相同,注意滿十進(jìn)一,和的小數(shù)點(diǎn)也要和加數(shù)的小數(shù)點(diǎn)對(duì)齊;小數(shù)乘法豎式:先把末位對(duì)齊,從末位開始算起,算法與整數(shù)乘法豎式相同,注意,積的小數(shù)位數(shù)等于乘數(shù)的小數(shù)位數(shù)之和;小數(shù)除法豎式:先把除數(shù)轉(zhuǎn)化成整數(shù),然后被除數(shù)也擴(kuò)大相同的倍數(shù),先從整數(shù)部分開始商起,不夠商1就商0,注意商的小數(shù)點(diǎn)要與移動(dòng)后被除數(shù)的小數(shù)點(diǎn)對(duì)齊;除不盡時(shí),要求保留幾位小數(shù),那么就要多商一位,然后“四舍五入”;據(jù)此解答即可。【詳解】35.9+8.2=44.1

9.46×0.85=8.041

0.736÷23=0.032

3.42÷3.3≈1.04

24.(22-23五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。3.81+0.69=

12.9-5.01=

43.68÷26=

8.05×13≈(保留整數(shù))【答案】4.5;7.89;1.68;105【分析】根據(jù)小數(shù)加法、減法的計(jì)算法則:計(jì)算小數(shù)加、減法,先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊);再按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)。(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉。)除數(shù)是整數(shù)的除法:先按照整數(shù)除法的法則去除,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊;如果除到被除數(shù)的末尾仍有余數(shù),就在余數(shù)后面添“0”,再繼續(xù)除。小數(shù)乘整數(shù)的計(jì)算方法:先按照整數(shù)乘法算出,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。保留整數(shù),即精確到個(gè)位,看小數(shù)點(diǎn)后面第一位(十分位),再利用“四舍五入法”求出近似數(shù)即可?!驹斀狻?.81+0.69=4.5

12.9-5.01=7.89

43.68÷26=1.68

8.05×13≈105

25.(22-23五年級(jí)上·江蘇揚(yáng)州·期末)用豎式計(jì)算。

【答案】5.33;12.43;13.325;1.9【分析】小數(shù)加減法的計(jì)算法則:1、計(jì)算小數(shù)加、減法,先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)擠)。2、再按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉)。小數(shù)乘法計(jì)算法則:按照整數(shù)乘法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起,向左數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。小數(shù)的除法計(jì)算法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù),被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法法則進(jìn)行計(jì)算?!驹斀狻?-2.67=5.33

5.73+6.7=12.43

2.05×6.5=13.325

7.98÷4.2=1.9

26.(22-23五年級(jí)上·江蘇徐州·期末)列豎式計(jì)算。9.57+1.5=

0.18-0.125=

98×0.05=

0.453÷0.15=【答案】11.07;0.055;4.8;3.02【分析】小數(shù)的加、減法計(jì)算:先把小數(shù)點(diǎn)對(duì)齊,再按照整數(shù)加、減法的計(jì)算方法計(jì)算,得數(shù)里的小數(shù)點(diǎn)要和加數(shù)、減數(shù)中的小數(shù)點(diǎn)對(duì)齊;小數(shù)乘小數(shù)的計(jì)算方法:先按照整數(shù)乘法的計(jì)算方法計(jì)算,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn);小數(shù)除法的計(jì)算方法:在計(jì)算除數(shù)是小數(shù)的除法時(shí)。根據(jù)商不變的性質(zhì),將除數(shù)和被除數(shù)同時(shí)擴(kuò)大相同的倍數(shù),轉(zhuǎn)化成除數(shù)是整數(shù)的除法進(jìn)行計(jì)算?!驹斀狻?.57+1.5=11.07

0.18-0.125=0.055

98×0.05=4.9

0.453÷0.15=3.02

27.(23-24五年級(jí)上·江蘇鹽城·期末)用豎式計(jì)算。(帶*的要驗(yàn)算)58.6÷11≈(保留兩位小數(shù))

15.203-9.27=

*4.38×0.37=【答案】5.33;5.933;1.6206【分析】根據(jù)除數(shù)是整數(shù)的小數(shù)除法的運(yùn)算法則,除數(shù)是整數(shù)的小數(shù)除法,按照整數(shù)除法的法則去除,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊;如果除到被除數(shù)的末尾仍有余數(shù),就在余數(shù)后面添0再繼續(xù)除;得數(shù)保留兩位小數(shù),看千分位上的數(shù)字是否滿5,然后運(yùn)用“四舍五入”法求得近似數(shù)即可;依據(jù)小數(shù)減法的計(jì)算方法解答:計(jì)算小數(shù)減法,先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊),再按照整數(shù)減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn);小數(shù)乘小數(shù)的計(jì)算方法,先按照整數(shù)乘法的計(jì)算方法計(jì)算,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn),利用積÷一個(gè)因數(shù)=另一個(gè)因數(shù)進(jìn)行驗(yàn)算?!驹斀狻?8.6÷11≈5.33

15.203-9.27=5.933

*4.38×0.37=1.6206

驗(yàn)算:28.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算,帶☆的題要驗(yàn)算。20.3-7.58=

☆0.84×6.5=

2.7÷0.46≈(得數(shù)保留兩位小數(shù))【答案】12.72;5.46;5.87【分析】小數(shù)加法和減法的法則:相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊),從低位算起,然后按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)要和上面的小數(shù)點(diǎn)對(duì)齊。小數(shù)乘法法則:按整數(shù)乘法的法則先求出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。小數(shù)乘法驗(yàn)算時(shí),根據(jù)乘法和除法互為逆運(yùn)算的關(guān)系,用積除以一個(gè)因數(shù),如果所得的商與另一個(gè)因數(shù)相同,那么原計(jì)算正確。計(jì)算除數(shù)是小數(shù)的除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。商保留幾位小數(shù),就算到它的下一位,用“四舍五入法”取值。【詳解】20.3-7.58=12.72

☆0.84×6.5=5.46

2.7÷0.46≈5.87

驗(yàn)算:29.(22-23五年級(jí)上·江蘇蘇州·期末)用豎式計(jì)算。①17.5-6.27=

②7.5×0.24=

③78.5÷13≈(得數(shù)保留兩位小數(shù))【答案】①11.23;②1.8;③6.04【分析】小數(shù)的加法和減法的法則:(1)相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊);(2)從低位算起;(3)按整數(shù)加減法的法則進(jìn)行計(jì)算;(4)結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊。小數(shù)乘法法則:(1)按整數(shù)乘法的法則先求出積;(2)看因數(shù)中一個(gè)有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。小數(shù)除以整數(shù),按整數(shù)除法的方法去除,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)點(diǎn)對(duì)齊,如果有余數(shù),要添“0”繼續(xù)除。保留兩位小數(shù)看千分位,小于5直接舍去,大于或等于5向前一位進(jìn)一?!驹斀狻竣?7.5-6.27=11.23

②7.5×0.24=1.8

③78.5÷13≈6.04

30.(22-23五年級(jí)上·江蘇連云港·期末)列豎式計(jì)算,并在草稿紙上驗(yàn)算。0.63+3.7

8.36-7.4

0.82×29

0.756÷0.18【答案】4.33;0.96;23.78;4.2【分析】計(jì)算小數(shù)加、減法:先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊);在按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn),點(diǎn)上小數(shù)點(diǎn)(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉)。加法的驗(yàn)算用減法,減法的驗(yàn)算用加法;小數(shù)乘法法則:先按照整數(shù)乘法的計(jì)算法則算出積,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果位數(shù)不夠,就用“0”補(bǔ)足;乘法的驗(yàn)算用除法;除數(shù)是整數(shù)的小數(shù)除法:按照整數(shù)的法則去除,商的小數(shù)點(diǎn)要與被除數(shù)的小數(shù)點(diǎn)對(duì)齊;如果被除數(shù)比除數(shù)小,商的個(gè)位上寫“0”;如果被除數(shù)的末尾仍有余數(shù),就在余數(shù)后面添0繼續(xù)除;除法的驗(yàn)算用乘法,據(jù)此解答?!驹斀狻?.63+3.7=4.33

8.36-7.4=0.96

驗(yàn)算:

驗(yàn)算:0.82×29=23.78

0.756÷0.18=4.2驗(yàn)算:

驗(yàn)算:31.(22-23五年級(jí)上·江蘇南京·期末)用豎式計(jì)算,帶*的得數(shù)保留兩位小數(shù)。4.35+5.58=

7.09-2.39=

*0.37×4.8≈

*2.5÷0.45≈【答案】9.93;4.71.78;5.56【分析】計(jì)算小數(shù)加法、減法:先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊);再按照整數(shù)加法、減法的法則進(jìn)行計(jì)算,得數(shù)里的小數(shù)點(diǎn)要和橫線上的小數(shù)點(diǎn)對(duì)齊(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉)。小數(shù)乘法法則:先按照整數(shù)的乘法法則進(jìn)行計(jì)算,求出整數(shù)乘法的積,然后看兩個(gè)因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn)。如果小數(shù)的末尾出現(xiàn)0時(shí),根據(jù)小數(shù)的基本性質(zhì),要把它去掉。小數(shù)除法計(jì)算方法:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位,位數(shù)不夠時(shí),在被除數(shù)的末尾用0補(bǔ)足;最后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。得數(shù)保留兩位小數(shù)看小數(shù)點(diǎn)后第三位是幾,再根據(jù)“四舍五入”法進(jìn)行保留即可?!驹斀狻?.35+5.58=9.93

7.09-2.39=4.7

*0.37×4.8≈1.78

*2.5÷0.45≈5.56

32.(24-25五年級(jí)上·江蘇·期末)用豎式計(jì)算。2.58+3.47=

6.2-4.95=

7.5×0.24=

5.25÷3.5=【答案】6.05;1.25;1.8;1.5【分析】(1)(2)小數(shù)的加法和減法的法則:相同數(shù)位對(duì)齊〈小數(shù)點(diǎn)對(duì)齊),從低位算起,然后按整數(shù)加減法的法則進(jìn)行計(jì)算,結(jié)果中的小數(shù)點(diǎn)要和上面的小數(shù)點(diǎn)對(duì)齊;(3)小數(shù)乘法先按照整數(shù)乘法的計(jì)算方法算出積,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果小數(shù)的位數(shù)不夠,需要在前面補(bǔ)0占位;(4)除數(shù)是小數(shù)的小數(shù)除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù);除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的,在被除數(shù)的末尾用0補(bǔ)足)﹔然后按除數(shù)是整數(shù)的小數(shù)除法進(jìn)行計(jì)算。【詳解】2.58+3.47=6.05

6.2-4.95=1.25

7.5×0.24=1.8

5.25÷3.5=1.5

33.(23-24五年級(jí)上·江蘇徐州·期末)用豎式計(jì)算。(帶★要驗(yàn)算)12.4+0.56=

11.8-4.51=

★3.84÷1.2=

2.05×0.67≈(得數(shù)保留一位小數(shù))【答案】12.96;7.29;3.2;1.4【分析】計(jì)算小數(shù)加、減法:先把各數(shù)的小數(shù)點(diǎn)對(duì)齊(也就是把相同數(shù)位上的數(shù)對(duì)齊);在按照整數(shù)加、減法的法則進(jìn)行計(jì)算,最后在得數(shù)里對(duì)齊橫線上的小數(shù)點(diǎn),點(diǎn)上小數(shù)點(diǎn)(得數(shù)的小數(shù)部分末尾有0,一般要把0去掉)。小數(shù)乘法法則:先按照整數(shù)乘法的計(jì)算法則算出積,再看因數(shù)中共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);如果位數(shù)不夠,就用“0”補(bǔ)足;除數(shù)是小數(shù)的除法計(jì)算法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù),被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法法則進(jìn)行計(jì)算;除法的驗(yàn)算用乘法;保留幾位小數(shù),就看保留小數(shù)的下一位小數(shù),再根據(jù)“四舍五入”法進(jìn)行解答?!驹斀狻?2.4+0.56=12.96

11.8-4.51=7.29

3.84÷1.2=3.2

2.05×0.67≈1.4驗(yàn)算:

34.(22-23五年級(jí)上·江蘇淮安·期末)用豎式計(jì)算,帶*的題要驗(yàn)算。

(得數(shù)保留兩位小數(shù))【答案】58.94;2.08;1.47【分析】小數(shù)的加法和減法的法則:(1)相同數(shù)位對(duì)齊(小數(shù)點(diǎn)對(duì)齊);(2)從低位算起;(3)按整數(shù)加減法的法則進(jìn)行計(jì)算;(4)結(jié)果中的小數(shù)點(diǎn)和相加減的數(shù)里的小數(shù)點(diǎn)對(duì)齊。小數(shù)除法法則:先移動(dòng)除數(shù)的小數(shù)點(diǎn),使它變成整數(shù)。除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)(位數(shù)不夠的補(bǔ)“0”),然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。小數(shù)乘法法則:(1)按整數(shù)乘法的法則先求出積;(2)看因數(shù)中一個(gè)有幾位小數(shù),就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)。根據(jù)商×除數(shù)=被除數(shù),進(jìn)行驗(yàn)算;保留兩位小數(shù)看千分位,小于5直接舍去,大于或等于5向前一位進(jìn)一。【詳解】=58.94

=2.08

≈1.47

驗(yàn)算:

35.(23-24五年級(jí)上·江蘇鹽城·期末)列豎式計(jì)算。(除不盡的保留兩位小數(shù))(1)2.15×3.6

(2)71÷15【答案】(1)7.74;(2)4.73【分析】(1)先計(jì)算215×36,按照整數(shù)乘法法則進(jìn)行計(jì)算,215×6=1290,215×30=6450,將兩部分相加得到7740。因?yàn)?.15有兩位小數(shù),3.6有一位小數(shù),所以它們的積共有三位小數(shù)。從7740的右邊數(shù)出三位點(diǎn)上小數(shù)點(diǎn),得到7.74。(2)計(jì)算71÷15時(shí),15除71,商4余11,11不夠15除,補(bǔ)0變成110繼續(xù)除,商7余5,5不夠15除,再補(bǔ)0變成50繼續(xù)除,商3余5。因?yàn)轭}目要求保留兩位小數(shù),此時(shí)第三位小數(shù)是3小于5,舍去,所以結(jié)果約為4.73?!驹斀狻?.15×3.6=7.74

71÷15≈4.73

36.(23-24五年級(jí)上·江蘇南京·期末)用豎式計(jì)算下面各題,加“★”的得數(shù)保留兩位小數(shù)。

★【答案】5.11;7.74;3.68【分析】計(jì)算小數(shù)加法:先把各數(shù)的小數(shù)點(diǎn)對(duì)

溫馨提示

  • 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 人人文庫網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。

最新文檔

評(píng)論

0/150

提交評(píng)論