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-2024學(xué)年北師大版五年級(jí)上冊(cè)數(shù)學(xué)期末豎式計(jì)算專題訓(xùn)練一、豎式計(jì)算。1.列豎式計(jì)算。3.22×0.65= 2.8÷1.6= 1.275÷0.55=(用循環(huán)小數(shù)表示)2.列豎式計(jì)算。27.5×1.2= 2.65÷3.4≈(得數(shù)保留一位小數(shù)) 5.88÷0.56=3.用豎式計(jì)算,帶*的要驗(yàn)算。15.6÷24= 1.6÷12≈(結(jié)果保留兩位小數(shù)) *6.75÷15=4.用豎式計(jì)算。30.8÷14= 197.6÷0.52= 2÷18≈(保留兩位小數(shù))5.用豎式計(jì)算,帶*的算式要驗(yàn)算。39÷2.5= 96.6÷42= *2.03÷0.58=6.用豎式計(jì)算,帶★的要驗(yàn)算。1.134÷0.42= 98÷5.6= ★20.4÷1.7=7.豎式計(jì)算,帶★的要驗(yàn)算。12.4÷5= 6.56÷3.2= ★64.8÷0.8=8.豎式計(jì)算。(帶☆的題需要驗(yàn)算)☆84÷3.5= 1.976÷0.95= 20÷3=(得數(shù)用循環(huán)小數(shù)表示)9.用豎式計(jì)算,帶※的要驗(yàn)算。4.69÷0.7= 6.5÷9= ※13.7÷2.74=10.列豎式計(jì)算。5.43×8.6= 8.74÷0.19= 6.64÷3.3=(商用循環(huán)小數(shù)表示)11.列豎式計(jì)算(帶☆的要驗(yàn)算)。28.7÷14= 2.52÷3.5= ☆7.28÷1.3=12.用豎式計(jì)算。3.2×56= 20.7÷0.23= 5.628÷2.8=13.用豎式計(jì)算,帶*的算式要驗(yàn)算。17.4÷12= 1.8÷0.48= *15.2÷1.9=65.3÷1.5≈(保留兩位小數(shù)) 4.18÷1.3≈(保留兩位小數(shù)) *32.4÷3.6=14.用豎式計(jì)算70÷5.6= 4.2÷12= 24.5÷2.5=15.12÷4.5= 176.4÷0.63= 9.744÷4.8=用豎式計(jì)算。3列豎式計(jì)算,帶*的要驗(yàn)算。17.4÷12=17.用豎式計(jì)算。27÷45= 6.58÷4.7= 6.76÷52= 0.189÷0.18=18.豎式計(jì)算。24.6÷12= 8÷0.17≈(保留兩位小數(shù)) 0.18÷2.5=19.豎式計(jì)算。帶*的要驗(yàn)算。70÷5.6= 0.77÷3.5= *42÷12=1.25÷0.25= 6.12÷0.29≈(得數(shù)保留一位小數(shù)) *6.58÷4.7=20.列豎式計(jì)算,帶☆的要驗(yàn)算。0.36×24= ☆2.05×420= 96.2÷5.2=☆25.3÷0.88= 1.57÷3.9≈(保留兩位小數(shù)) 70.7÷33=(商用循環(huán)小數(shù)表示)21.列豎式計(jì)算。35.14×16.67= 49.87×24.9= 35.24÷9.27≈(得數(shù)保留兩位小數(shù)) 68.47÷12.34≈(得數(shù)保留兩位小數(shù))22.列豎式計(jì)算。21.4×36= 2.15×4.4= 8.46×7=43.4÷31= 29.7÷11= 7.53×0.9=23.列豎式計(jì)算,帶★的保留兩位小數(shù)。3.25×0.6= 0.43×7= 6.24÷0.4=★1.4÷0.45≈ ★5.84×0.16≈ 3.02×1.5=24.列豎式計(jì)算。7.2×0.86= 270×0.041= 0.13×0.27≈(得數(shù)保留兩位小數(shù))15.2÷4= 25.84÷1.7= 47.04÷1.4=25.列豎式計(jì)算。39.6÷12= 21.28÷7= 5.65×0.35≈(得數(shù)保留兩位小數(shù)) 726.用豎式計(jì)算,帶☆號(hào)的要驗(yàn)算。3.48×2.7= 382.5÷45= 2.52÷3.5=4.2÷0.28= ☆7.28÷1.3= 0.375×5.6=27.列豎式計(jì)算。(帶☆的要驗(yàn)算)86.4÷36= 1.57÷3.9≈保留兩位小數(shù)) ☆7.59÷0.23=28.列豎式計(jì)算,帶*的要驗(yàn)算。98÷2.8= 46.5÷15= 29.用豎式計(jì)算。(除不盡時(shí)保留兩位小數(shù))0.54÷0.121.08÷4.587÷3330.列豎式計(jì)算(帶※的要驗(yàn)算)。※10.8÷4.5= 6.21÷0.03= 8.27÷0.3≈(結(jié)果保留兩位小數(shù))
答案解析部分1.【答案】解:3.22×0.65=2.093
2.8÷1.6=1.75
1.275÷0.55=2【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。2.【答案】解:27.5×1.2=33
2.65÷3.4≈0.8
5.88÷0.56=1.05
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。3.【答案】解:15.6÷24=0.65
1.6÷12≈0.13
6.75÷15=0.45
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。4.【答案】解:30.8÷14=2.2
197.6÷0.52=380
2÷18≈0.11
【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。5.【答案】解:39÷2.5=15.6
96.6÷42=2.3
2.03÷0.58=3.5
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。6.【答案】解:1.134÷0.42=2.7
98÷5.6=17.5
20.4÷1.7=12
驗(yàn)算:【解析】【分析】計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。7.【答案】解:12.4÷5=2.48
6.56÷3.2=2.05
64.8÷0.8=81
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。8.【答案】解:84÷3.5=24
驗(yàn)算:
1.976÷0.95=2.08
20÷3=6.6
【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。9.【答案】解:4.69÷0.7=0.7
6.5÷9=0.72
13.7÷2.74=13.7
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。10.【答案】解:5.43×8.6=46.698
8.74÷0.19=46
6.64÷3.3=2.01?【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。11.【答案】解:28.7÷14=2.05
2.52÷3.5=0.72
7.28÷1.3=5.6
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。12.【答案】解:3.2×56=179.2
20.7÷0.23=90
5.628÷2.8=2.01
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。13.【答案】解:17.4÷12=1.45
1.8÷0.48=3.75
15.2÷1.9=8
65.3÷1.5≈43.53
4.18÷1.3≈3.22
32.4÷3.6=9
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。14.【答案】解:70÷5.6=12.5
4.2÷12=0.35
24.5÷2.5=9.8
15.12÷4.5=3.36
176.4÷0.63=280
9.744÷4.8=2.03【解析】【分析】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)幾位,然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算。
15.【答案】解:3.36÷4.2=0.8
10.8÷45=0.24
2.4÷1.6=1.5
【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。16.【答案】解:17.4÷12=1.45
1.8÷0.48=3.75
15.2÷1.9=8
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。17.【答案】解:27÷45=0.6
6.58÷4.7=1.4
40.6÷2.9=14
6.76÷52=0.13
0.189÷0.18=1.05
3.886÷0.58=6.7
【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。18.【答案】解:24.6÷12=2.05
8÷0.17≈47.06
0.18÷2.5=0.072
【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。19.【答案】解:70÷5.6=12.5
0.77÷3.5=0.22
42÷12=3.5
驗(yàn)算:
1.25÷0.25=5
6.12÷0.29≈21.1
6.58÷4.7=1.4
驗(yàn)算:【解析】【分析】計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。20.【答案】解:0.36×24=8.64
2.05×420=861
驗(yàn)算:
96.2÷5.2=18.5
25.3÷0.88=28.75
驗(yàn)算:
1.57÷3.9≈0.40
70.7÷33=2.14·2·
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。21.【答案】解:35.14×16.67=585.7838
49.87×24.9=1241.763
35.24÷9.27≈3.80
68.47÷12.34≈5.55
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。22.【答案】解:21.4×36=770.4
2.15×4.4=9.46
8.46×7=59.22
43.4÷31=1.4
29.7÷11=2.7
7.53×0.9=6.777
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0。23.【答案】解:3.25×0.6=1.95
0.43×7=3.01
6.24÷0.4=15.6
1.4÷0.45≈3.11
5.84×0.16≈0.93
3.02×1.5=4.53
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。24.【答案】解:7.2×0.86=6.192
270×0.041=11.07
0.13×0.27≈0.04
15.2÷4=3.8
25.84÷1.7=15.2
47.04÷1.4=33.6
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0;
計(jì)算除數(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,然后按照除數(shù)是整數(shù)的小數(shù)除法計(jì)算即可。25.【答案】解:39.6÷12=3.3
21.28÷7=3.04
0.38×8.5≈3
5.65×0.35≈1.98
7.28÷13=0.56
63÷15=4.2
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的位數(shù)不夠時(shí),用0補(bǔ)足;
計(jì)算除數(shù)是整數(shù)的小數(shù)除法,可以按照整數(shù)除法的計(jì)算方法計(jì)算,商的小數(shù)點(diǎn)要和被除數(shù)的小數(shù)對(duì)齊,被除數(shù)的整數(shù)部分不夠除時(shí),要商0。26.【答案】解:3.48×2.7=9.396
382.5÷45=8.5
2.52÷3.5=0.72
4.2÷0.28=15
7.28÷1.3=5.6
0.375×5.6=2.1
【解析】【分析】計(jì)算小數(shù)乘法,先按照整數(shù)乘法的計(jì)算方法計(jì)算出結(jié)果,然后數(shù)出因數(shù)中有幾位小數(shù),就從積的末尾數(shù)出幾位,然后點(diǎn)上小數(shù)點(diǎn)即可,當(dāng)積的
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