小数乘法口算500道+竖式300道(含答案)-乘法500道

小数乘法口算500道+竖式300道第一部分口算500道一．计算题（共50小题）1.直接写得数．0.5×1.4=80×0.125= 2.5×0.4=0.036×100=0.24×5=0.12×0.5=35÷1000= 2.2×0.5=0.12×5=0.04×0.1= 3.5+0.15=8﹣6.9=2．口算．0.4×5 1.2×44×1.51×0.50.01×0.1 1.25×0.40.36×0.20.8×03．直接写出得数．0.12×6= 1.25×0.4=30×0.8=12.5×0.8= 3.73﹣0.8﹣1.73= 3.26×0= 3.25+0.74= 5.2﹣2.64=0.24×5=4×0.05×2=3.9+7.1= 6.2×0.5=0.25×0.4=0.036×100= 3.64+6.36+5.5= 4．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25= 5．直接写得数：0.5×3=0.45+0.4=4×0.25=10.2+11.3= 0.09×100=8.7﹣0.5=0.96﹣0.7=12.9﹣2.9= 3.69×0=38.7÷10=6．直接写得数：0.2×3=0.45+0.4=4×0.25=18.7+11.3=0.09×100=8.7﹣0.5=0.96﹣0.7=18﹣1.67=1×8.79= 3.69×0=38.7÷10=2÷100=7．直接写出得数．0.28×10=0.9×5=8×0.06=0.05×1.6= 100×0.7= 2.5×8= 1.06×7=12.5×0= 1.7+3.3×0.2=0.2×0.2×0.2=8．直接写得数：0.2×36=0.45×2=4×0.25= 3.8÷100=0.09×1000=1﹣0.9=0.96﹣0.7= 2.5×7.4×4= 9．口算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5= 10．直接写出得数．0.7×0.9=0.14×0.3= 1.7×0.03=0.12×6=5.5×10= 2.6×0.5= 1.8×0.04= 2.6×2﹣0.5= 11．直接写出得数．5×1.8=0.8×1.5=0.65+0.35=9.8+1.2=0.25×4=1﹣0.63=10.75﹣0.5= 1.25×80=1.7×0.9= 4.6×0.5= 1.42×100=19.8﹣8= 12．直接写出得数．0.25×4= 1.25×8=8.2×6.9×0=0.2×18=6.29×100=0.02×500= 3.4×2=0.26×0.5= 13．直接写得数0.2×4=0.8×25=0.57+0.43= 2.8×10=18.4÷100= 2.5×0.4= 4.7﹣1.78=0.125×8=1.8×0.5=0.035×1000=14．口算0.4×20= 1.3×3=0.25×50=0.9×300 2.4×50=0.125×200=600×0.4=800×0.25=1500×0.2=15．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8=24.5×6.820.6×4.5=10.2×5.01=16．直接写得数．3.14×7=52=6π=62﹣20=402﹣302=b×b= 3.14×302= 3.14×42= 1.25×32=b+b=17．直接写得数．0.16×5= 4.2×0.3=25×0.4=2×0.45=0.5×0.07=0.3×0.7×10=18．口算题．0.1×208= 2.8×2=3×0.18=0.2×600= 1.3×5=8×0.05= 1.3×50= 80×0.05=7.26×1=0.4×22=0.15×40=0.7×1.4=1.25×10= 4.5×0.02=0.03×8=0×1.001=0.8×12.5=0.4×0.7= 1.3×4= 1.35×10= 1.4×0.4=1.4×5= 1.45×100=3.5×40=0.02×38=25×0.4= 1.6×1.5=0.01×10= 250×0.04=1.5×0.02=0.05×12=200×0.05=2.5×0.4=0.05×430=20×0.5= 250×0.4=7.682×0=2×0.005= 2.05×2=19．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4=0.3×0.3=0.35+0.75=0.48+1.62=10.1×78=20．直接写出得数．0.2×8= 6.2+0.04= 2.5×0.4=0.6×0.7=18.5+71.5= 6.4+4.6=0.04×0.3= 2.1﹣2.01= 1.41×1000=21．直接写出得数45+426=58.7﹣38.5= 2.25×8= 2.7×0.8= 6.4×0.8=320×0.03=11.004×50= 4.8×9.8= 22．口算．2.4×0.3=0.25×4=0.06×0.8=8.5×0.2= 1.25×0.8=7.5×0.5=6×4.4=0.13×0.05=19×0.7=23．口算：0.9×0.3= 3.5×0.2= 2.1×0= 6.6×10=0.3×7= 0.27×3=3×9.6=0.8×1.5=7.2×0.6= 2.5×0.4= 24．口算0.37×10=0.37×100=0.37×1000= 2.5×4= 0.25×4= 4.8×2=0.12×0.3=2×5.8= 0.28×3=0.16×4= 3.5×2=5×1.2= 5×1.5=3×0.25= 3.5×0.2= 3.5×5= 5×0.25=0.3×0.2= 3.5×0.5=3×1.5= 25．直接写得数．0.5×6=0.125×8= 2.5×0.4= 3.1×0.3=4×0.25= 1.25×6=0.2×0.05=0.8×0.05= 1.7×0.3= 1.25×200=40×0.05=0.04×2=26．口算．0.2×50= 2.4×0.5=0.25×4= 3.2×0.3=12.5×80=0.17×10= 4.5+3.85= 2.5×0.7×0.4=3.5×8= 1.2×0.6= 5.2﹣2.8= 3.7+5.8=27．直接写得数．0.5×0.7= 2.1×0.4= 3.4×0.2=0.06×1.2=0.63×2=0.05×0.06=0.8×0.4=7.85×0.01= 0.15×0.4= 1.3×30=0.25×0.6= 3.125×100= 28．直接写出得数．12.5×8= 2.5×0.4= 6.4+4.6=0.04×0.3=0.5×2.4=0.2×2.5= 5.18+3.02= 1.41×1000=29．口算：0.3×4= 2.3×0.2= 3.6+6.4=0.6×0.7=1.6×0.4=0.9×0.08=0.25×4=12.5×8= 0.7×0.9=0.04×0.2=0.8×0.05=3.1×0.3= 0.16×0.5= 1.7×0.03= 1.8×0.04=0.12×6= 30．直接写得数0.8×25=0×4.23=0.57+0.43=0.02×500=12.5×8=50×0.04=80×0.3= 1.1×9=31．直接写得数．0.7×10 3.02×100 3.6×2 4×1.52.5×4 12.5×0.8 4.5+2.6 7﹣1.66.4﹣2.3 10+6.01 8.3﹣1.37.3+2.7 32．口算9.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4=35×0.4=33．口算．0.8×7=0.9×0.3= 1.32×8=10.3×2=3.5×0.2=10×0.05=0.13×7=0.05×4=30×0.1=12.5×8= 3.25×0=0.4×50= 34．直接写出得数：2.5×4= 2.4×0.5=8×0.125=0.27×3=7﹣6.38=0.22×0.5=35．直接写出得数．（后两题得数保留一位小数）0.7×0.9=0.14×0.3= 1.7×0.03= 1.8×0.04≈0.12×6= 5.5×10= 2.6×0.5= 2.6×0.08≈36．直接写出得数0.45×0.2= 4.38+3.5=0.9×7=（3.85+5.45）×0=0.75×1= 2.5×4= 5.4×20=7.5×0.4=37．口算．2.3×2=10×0.2= 1.45×10= 4.3×10═ 2.4×5=4.5×0.9= 2.5×8= 3.9×3=5×0.01=5.98×1000= 38．直接写得数：2.5×33.06×2 0.25×44.2×105.3×100 2.5×62.2×4 1.6×4 1.25×839．口算．1.5×8=2.4×5= 1.25×8=3.58×2=0.5×0.9=40．直接写得数0.7×0.9=0.12×50=60×0.5= 1.8×0.04=1.25×8=24×0.05=0.15×0.4=0.9×1.5=3.4×0.7=0.78×0.2=30×0.5=0.8×0.9=41．口算．0.5×0.2=50×0.2=500×0.2= 2.4×4= 2.5×0.4= 0.25×40=0.125×8=12.5×8= 1.25×80=0.24×5= 42．口算：0.5×2=0.25×4=12.5×8=0.125×8=7÷0.7=1﹣0.125×8= 1.25×32=0.25×56=43．直接写出得数．0.4×0.3= 2.5×0.6=8.8×0.1= 1.3×0.2=5.28+1.6=10﹣1.7﹣2.3=6.09×0=100×0.7=44．直接写出得数0.5×0.2=0.25×0.4= 1.25×8=0×1000+3=0.5÷100=0.12×40=100×0.78=12.78+0.22=0.6+0+0.7=0.72+1000=45．直接写得数．0.5×0.2=4×0.15=50×0.4=8×0.125=0.23×10=0.12×7=46．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5= 47．口算0.2×0.4=8.2+1.8=100﹣35.22= 2.5×0.4=0.8×50=8×0.24= 3.9×1.3= 2.4×5=0.9﹣0.52=0×3.52=12.5×8= 2.4×0.01= 48．直接写得数0.8×0.6= 5.5×3=0.5×0.6=0.125×0.8=9.6×0.1= 0.07×0.9=12.4×0.2= 2.4×5=14×0.01= 1.5×2= 49．口算．0.37×100=0.25×4=0.3×0.2=70×0.12=18×0.3=0.5×0.6= 3.7×0.2=5×1.2=第二部分竖式300道一．计算题（共50小题）1．列竖式计算．75﹣8.49= 3.72×1.25= 5.04×26=5.94+12.7=0.95×6.7=35.62﹣13.4=2．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数） 4.865×8≈（保留整数）10.23×42≈（保留一位小数）3．竖式计算（前面有*要验算）．2.18×3.6*4.23×0.8620.07×1.0250.6×0.90.57×0.86*0.8×0.314．用竖式计算．8×0.12=（验算） 1.9×3.5=（验算）0.401×0.3=0.45×0.96=0.17×0.71=5．竖式计算4.57×1.8 0.125×0.8 3.75×0.249.37×8.52.07×3.6 3.35×1.6．6．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75=1.06×0.48=18.9+28.65=22.87﹣18.65=7．竖式计算7.6×0.82= 3.25×0.31=7.5×0.59=（验算）8．列竖式计算，带*号的要验算．25.78+3.12=13.8×9=*8﹣2.67=*5.73+6.7=9．列竖式计算4.8×17 1.88×25 2.4×0.370.89×5.3．10．列竖式计算．3.8×0.15=4.6×50=8.7×2.04= 13.2×9.8=0.86×0.72=5﹣1.08=11．列竖式计算．（得数保留两位小数）2.375×105 5.16×4.3 0.45×0.206．12．用竖式计算．4.8×0.259.3×1.39.8×0.5 2.1×2.15．13．列竖式计算．0.04×0.12 4.25×8.8 3.84×0.25．14．用竖式计算．62.4+7.62= 6.07﹣4.993=8.7×1.4= 1.28×3.5=15．列竖式计算8×0.125 4.23×536.5×425×0.12618×1.833.42×2016．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8=24.5×6.820.6×4.5=10.2×5.01=17．列式计算：2.02×2.410.33﹣9.083.88+1.5418．用竖式计算．3.5×7=8.1×16= 3.27×21=5.63×36= 4.32×7=64×0.07=19．用竖式计算．4.26×7.5= 3.15×1.4=47.5×0.6=5.25×0.24=7.38×2.5=14.24×0.35=1.21×8=2.4×0.2=0.57×0.43=20．列竖式计算．8.5×16= 4.15×24=0.32×7= 6.4×9= 2.5×36=0.04×270= 1.25×3= 3.75×6= 21．计算并验算．0.04×0.568.04×0.001 4.012×0.30.42×0.080.209×0.15 4.8×0.0015 87.5×2.410.28×0.731.4×3.822．列竖式计算0.82×2= 3.95×42= 2.073×15=0.78×24= 2.6×61=0.059×0.2= 4.268×1.7=57×5.7= 9.46×2.85=17.8×6.4= 1.5×4.9= 2.5×0.88=23．用竖式计算．1.24×0.8=0.85×1.2=7.05×2.4=12.3×2.4=60.5×400=89.3×7.6=24．竖式计算下面各题（得数保留两位小数）0.46×3.5=0.86×1.4=0.036×2.5=8.4×1.03=25．用竖式计算25﹣12.54= 1.59×2.4=2137÷29=26．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4= 0.3×0.3=0.35+0.75=0.48+1.62=10.1×78= 27．用竖式计算．5.08×0.65=54.68﹣12.8=19.92+420.26 7.02×0.67=28．用竖式计算．4.8×2.5=5.07×0.29=0.32×1.7≈（得数保留一位小数）4.08×6.7≈（得数保留两位小数） 6.03×0.74≈（得数保留两位小数）29．竖式计算（第一、第二道的数保留两位小数）3.52×0.05≈120.44×0.2≈8.25×1.48.76×3.5 4.25×0.4 2.7×1.631．竖式计算0.38×0.25 150×0.12 0.87×1.91.28×2.3 2.07×0.24 0.17×1.0532．用竖式计算，前两题要验算．0.65×4.7= 2.06×9.4=0.072×8.5=9.9×0.99= 2.04×0.8=33．列竖式计算．3.2×30= 1.25×4=4.2×15=11.5×108=0.28×4.5= 0.27×0.36= 2.6×3.8=250×0.98= 6.05×1.6=10.8×2.07=34．列竖式计算．0.54×2.7 2.8×7.4 15.4×0.7 27.5×3.4．27.6×0.45 8.08﹣2.68 5.546+29.380.023×1.817.04×0.26 8.35×3.5 5.08×0.25 1.18×3.436．列竖式计算．2.6×0.6 6.7×0.0715.6×1.3 0.81×2.7．37．用竖式计算：（得数保留一位小数）3.65×2.6 0.462÷2.80.627+3.3754.35﹣0.435．38．竖式计算31.5×24.5=0.8×0.56= 4.23×0.028=0.63×1.05=36×0.56= 2.5×2.05=（1）计算并验算．2.3×0.29= 2.7×1.02=（2）得数保留两位小数．0.45×0.96 6.53×0.75（3）得数保留一位小数．10.6×0.2622.45×0.4．40．列竖式计算下面各题并验算：0.34×2.5= 1.5×1.7=0.28×0.39= 4.2×2.4=41．用竖式计算．4.2×0.08= 1.5×6.2= 2.7×8.17=2.9×0.56=（保留两位小数） 6.23×4.2=（保留一位小数）42．列竖式计算．3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.024．43．用竖式计算．84×0.25=0.55×64=0.47×5.8=6.06×0.32=0.075×0.07= 3.7×9.77=44．用竖式计算．5.08×0.65= 54.68﹣12.8= 80.4×0.35= 19.92+420.26=45．列竖式计算3.2×1.8= 1.05×62= 2.7×0.11=0.12×0.18=0.15×0.12= 2.7×1200=46．列竖式计算．7.6×0.82= 3.5×8.8= 3.25×0.31=0.93×2.02≈（结果精确到百分位） 5.9×3.14≈（结果保留一位小数）47．列竖式计算．1.2×1.36（结果保留两位小数）2.7×0.34（结果保留两位小数）0.74×5.8（结果保留两位小数） 2.6×3.5验算：0.25×0.12验算：48．用竖式计算18.8×38.2= 48×0.952=35.7×5.06≈（得数保留一位小数） 6.928×3.2≈（得数保留两位小数）49．用竖式计算．0.86×7= 3.3×16= 0.48×2.4= 1.7×0.45≈（保留两位小数）50．列竖式计算，带※的验算※0.38×0.25 1.07×2.1 （得数保留两位小数）7.4×2.84（得数保留一位小数） 1.08×9.5 0.75×1.02．第一部分口算500道参考答案与试题解析一．计算题（共50小题）1.【解答】解：0.5×1.4=0.780×0.125=10 2.5×0.4=10.036×100=3.60.24×5=1.20.12×0.5=0.0635÷1000=0.0352.2×0.5=1.10.12×5=0.60.04×0.1=0.0043.5+0.15=3.658﹣6.9=1.12．【解答】解：0.4×5=2 1.2×4=4.84×1.5=61×0.5=0.50.01×0.1=0.0011.25×0.4=0.50.36×0.2=0.0720.8×0=03．【解答】解：0.12×6=0.721.25×0.4=0.530×0.8=2412.5×0.8=10 3.73﹣0.8﹣1.73=1.2 3.26×0=0 3.25+0.74=3.995.2﹣2.64=2.560.24×5=1.24×0.05×2=0.43.9+7.1=11 6.2×0.5=3.10.25×0.4=0.10.036×100=3.63.64+6.36+5.5=15.5 4．【解答】解：0.4×0.02=0.0081.8×0.4=0.726×0.25=1.5 1.25×0.8=13﹣0.98=2.020.9÷0.01=903.9×0.01=0.03999×0.25=24.755．【解答】解：0.5×3=1.50.45+0.4=0.854×0.25=110.2+11.3=21.50.09×100=98.7﹣0.5=8.20.96﹣0.7=0.2612.9﹣2.9=103.69×0=038.7÷10=3.876．【解答】解：0.2×3=0.60.45+0.4=0.854×0.25=118.7+11.3=300.09×100=98.7﹣0.5=8.20.96﹣0.7=0.2618﹣1.67=16.331×8.79=8.793.69×0=038.7÷10=3.872÷100=0.027．【解答】解：0.28×10=2.80.9×5=4.58×0.06=0.480.05×1.6=0.08100×0.7=70 2.5×8=20 1.06×7=7.4212.5×0=01.7+3.3×0.2=2.360.2×0.2×0.2=0.0088．【解答】解：0.2×36=7.20.45×2=0.94×0.25=1 3.8÷100=0.0380.09×1000=901﹣0.9=0.10.96﹣0.7=0.262.5×7.4×4=749．【解答】解：0.2×0.4=0.088.2+1.8=106.45×0.01=0.06452.5×0.4=10.8×50=40 2.4×5=120.9﹣0.52=0.2810.2×4.5=45.910．【解答】解：0.7×0.9=0.630.14×0.3=0.0421.7×0.03=0.0510.12×6=0.725.5×10=55 2.6×0.5=1.3 1.8×0.04=0.0722.6×2﹣0.5=4.711．【解答】解：5×1.8=90.8×1.5=1.20.65+0.35=19.8+1.2=110.25×4=11﹣0.63=0.3710.75﹣0.5=10.251.25×80=1001.7×0.9=1.534.6×0.5=2.31.42×100=14219.8﹣8=11.812．【解答】解：0.25×4=1 1.25×8=108.2×6.9×0=00.2×18=3.66.29×100=6290.02×500=103.4×2=6.80.26×0.5=0.1313．【解答】解：0.2×4=0.80.8×25=200.57+0.43=1 2.8×10=2818.4÷100=0.1842.5×0.4=1 4.7﹣1.78=2.920.125×8=11.8×0.5=0.90.035×1000=3514．【解答】解：0.4×20=8 1.3×3=3.90.25×50=12.50.9×300=2702.4×50=1200.125×200=25600×0.4=240800×0.25=2001500×0.2=30015．【解答】解：2.3×0.8=1.84 6.9×3.1=21.399.87×1.8=17.76624.5×6.8=166.620.6×4.5=92.710.2×5.01=51.10216．【解答】解：3.14×7=21.9852=256π=18.8462﹣20=16402﹣302=700b×b=b2 3.14×302=28263.14×42=50.241.25×32=40b+b=2b17．【解答】解：0.16×5=0.84.2×0.3=1.2625×0.4=102×0.45=0.90.5×0.07=0.0350.3×0.7×10=2.118．【解答】解：0.1×208=20.82.8×2=5.63×0.18=0.540.2×600=1201.3×5=6.58×0.05=0.41.3×50=6580×0.05=47.26×1=7.260.4×22=8.80.15×40=0.60.7×1.4=0.981.25×10=12.54.5×0.02=0.090.03×8=0.240×1.001=00.8×12.5=100.4×0.7=0.281.3×4=4.21.35×10=13.51.4×0.4=0561.4×5=7 1.45×100=1453.5×40=1400.02×38=0.7625×0.4=101.6×1.5=2.40.01×10=0.1250×0.04=101.5×0.02=0.030.05×12=0.6200×0.05=102.5×0.4=10.05×430=21.520×0.5=10250×0.4=1007.682×0=02×0.005=0.012.05×2=4.119．【解答】解：1.5×0.2=0.3 1.25×0.8=1 4.5×0.4=1.82.5×7×0.4=7 0.3×0.3=0.090.35+0.75=1.10.48+1.62=2.110.1×78=787.8 20．【解答】解：0.2×8=1.6 6.2+0.04=6.24 2.5×0.4=10.6×0.7=0.4218.5+71.5=90 6.4+4.6=110.04×0.3=0.0122.1﹣2.01=0.091.41×1000=141021．【解答】解：45+426=47158.7﹣38.5=20.22.25×8=18 2.7×0.8=2.16 6.4×0.8=5.12320×0.03=9.611.004×50=550.24.8×9.8=47.04 22．【解答】解：2.4×0.3=0.720.25×4=10.06×0.8=0.0488.5×0.2=1.7 1.25×0.8=17.5×0.5=3.756×4.4=26.40.13×0.05=0.006519×0.7=13.323．【解答】解：0.9×0.3=0.273.5×0.2=0.72.1×0=0 6.6×10=660.3×7=2.1 0.27×3=0.813×9.6=28.80.8×1.5=1.27.2×0.6=4.322.5×0.4=1 24．【解答】解：0.37×10=3.70.37×100=370.37×1000=3702.5×4=100.25×4=1 4.8×2=9.60.12×0.3=0.0362×5.8=11.60.28×3=0.840.16×4=0.643.5×2=75×1.2=65×1.5=7.53×0.25=0.753.5×0.2=0.7 3.5×5=17.55×0.25=1.250.3×0.2=0.063.5×0.5=1.753×1.5=4.5 25．【解答】0.5×6=30.125×8=1 2.5×0.4=1 3.1×0.3=0.934×0.25=1 1.25×6=7.50.2×0.05=0.010.8×0.05=0.041.7×0.3=0.511.25×200=25040×0.05=20.04×2=0.08 26．【解答】解：0.2×50=10 2.4×0.5=1.20.25×4=1 3.2×0.3=0.9612.5×80=10000.17×10=1.74.5+3.85=8.352.5×0.7×0.4=0.7 3.5×8=28 1.2×0.6=0.725.2﹣2.8=2.4 3.7+5.8=9.527．【解答】解：0.5×0.7=0.35 2.1×0.4=0.84 3.4×0.2=0.680.06×1.2=0.072 0.63×2=1.260.05×0.06=0.0030.8×0.4=0.327.85×0.01=0.0785 0.15×0.4=0.061.3×30=390.25×0.6=0.153.125×100=312.5 28．【解答】解：直接写出得数：12.5×8=1002.5×0.4=1 6.4+4.6=110.04×0.3=0.0120.5×2.4=1.20.2×2.5=0.055.18+3.02=8.21.41×1000=1410 29．【解答】0.3×4=1.2 2.3×0.2=0.46 3.6+6.4=100.6×0.7=0.421.6×0.4=0.640.9×0.08=0.0720.25×4=112.5×8=1000.7×0.9=0.630.04×0.2=0.0080.8×0.05=0.04 3.1×0.3=0.930.16×0.5=0.081.7×0.03=0.0511.8×0.04=0.0720.12×6=0.72 30．【解答】解：0.8×25=200×4.23=00.57+0.43=10.02×500=1012.5×8=10050×0.04=280×0.3=241.1×9=9.931．【解答】解：0.7×10=7 3.02×100=302 3.6×2=7.2 4×1.5=62.5×4=10 12.5×0.8=10 4.5+2.6=7.1 7﹣1.6=5.46.4﹣2.3=4.1 10+6.01=16.01 8.3﹣1.3=77.3+2.7=1032．【解答】解：9.5×0.2=1.93.2×0.5=1.60.8×2.5=24.4×0.4=1.7635×0.4=14 4.8×50=2404.8×0.25=1.28.8×5=441.4×0.5=0.712.5×4=50 33．【解答】解：0.8×7=5.60.9×0.3=0.271.32×8=10.5610.3×2=20.63.5×0.2=0.710×0.05=0.50.13×7=0.910.05×4=0.230×0.1=312.5×8=100 3.25×0=00.4×50=2034．【解答】解：2.5×4=10 2.4×0.5=1.28×0.125=10.27×3=0.817﹣6.38=0.620.22×0.5=0.1135．【解答】解：0.7×0.9=0.630.14×0.3=0.0421.7×0.03=0.0511.8×0.04≈0.10.12×6=0.725.5×10=55 2.6×0.5=1.3 2.6×0.08≈0.2 36．【解答】解：0.45×0.2=0.094.38+3.5=7.880.9×7=6.3（3.85+5.45）×0=00.75×1=0.75 2.5×4=10 5.4×20=1087.5×0.4=337．【解答】解：2.3×2=4.610×0.2=21.45×10=14.54.3×10═432.4×5=124.5×0.9=4.052.5×8=203.9×3=11.75×0.01=0.055.98×1000=5980 38．【解答】解：2.5×3=7.53.06×2=6.12 0.25×4=14.2×10=425.3×100=5302.5×6=152.2×4=8.8 1.6×4=6.4 1.25×8=1039．【解答】解：1.5×8=122.4×5=12 1.25×8=103.58×2=7.16 0.5×0.9=0.451.2×6=7.2 0.2×0.9=0.18 0.72×5=3.6 0.37×4=1.48 0.25×0.4=0.1 40．【解答】解：0.7×0.9=0.630.12×50=660×0.5=30 1.8×0.04=0.0721.25×8=1024×0.05=1.20.15×0.4=0.060.9×1.5=1.353.4×0.7=2.380.78×0.2=0.15630×0.5=150.8×0.9=0.7241．【解答】解：（1）0.5×0.2=0.1（2）50×0.2=10（3）500×0.2=100（4）2.4×4=9.6（5）2.5×0.4=1（6）0.25×40=10（7）0.125×8=1（8）12.5×8=100（9）1.25×80=100（10）0.24×5=1.242．【解答】解：0.5×2=10.25×4=112.5×8=1000.125×8=17÷0.7=101﹣0.125×8=01.25×32=800.25×56=1443．【解答】解：0.4×0.3=0.122.5×0.6=1.58.8×0.1=0.881.3×0.2=0.265.28+1.6=6.8810﹣1.7﹣2.3=66.09×0=0100×0.7=7044．【解答】解：0.5×0.2=0.10.25×0.4=0.1 1.25×8=100×1000+3=30.5÷100=0.0050.12×40=4.8100×0.78=7812.78+0.22=130.6+0+0.7=1.30.72+1000=1000.7245．【解答】解：0.5×0.2=0.14×0.15=0.650×0.4=208×0.125=10.23×10=2.30.12×7=0.8446．【解答】解：0.7×0.9=0.63 2.6×0.5=1.30.14×0.3=0.0425.5×10=551.7×0.03=0.0511.8×0.04=0.0720.12×6=0.72 4.8×5=2447．【解答】解：0.2×0.4=0.088.2+1.8=10100﹣35.22=64.782.5×0.4=10.8×50=408×0.24=1.923.9×1.3=5.07 2.4×5=120.9﹣0.52=0.380×3.52=012.5×8=100 2.4×0.01=0.02448．【解答】解：0.8×0.6=0.48 5.5×3=16.50.5×0.6=0.30.125×0.8=0.19.6×0.1=0.96 0.07×0.9=0.06312.4×0.2=2.482.4×5=1214×0.01=0.141.5×2=3 49．【解答】解：0.37×100=370.25×4=10.3×0.2=0.0670×0.12=8.418×0.3=5.40.5×0.6=0.33.7×0.2=0.745×1.2=6第二部分竖式300道参考答案与试题解析一．计算题（共50小题）1．【解答】解：（1）75﹣8.49=66.51；（2）3.72×1.25=4.65；（3）5.04×26=131.04；（4）5.94+12.7=18.64；（5）0.95×6.7=6.365；（6）35.62﹣13.4=22.22．2．【解答】解：0.64×18=11.5225.8×102=2631.640.7×0.25=10.17513.45×2.6≈35 4.865×8≈3910.23×42≈429.73．【解答】解：2.18×3.6=4.848*4.23×0.86=3.6378验算：20.07×1.025=20.571750.6×0.9=0.540.57×0.86=0.4902*0.8×0.31=0.248验算：4．【解答】解：①8×0.12=0.96 ② 1.9×3.5=6.65③0.401×0.3=0.1203④0.45×0.96=0.432⑤0.17×0.71=0.12075．【解答】解：（1）4.57×1.8=8.226；（2）0.125×0.8=0.1；（3）3.75×0.24=0.9；（4）9.37×8.5=79.645；（5）2.07×3.6=7.452；（6）3.35×1.6=5.36．6．【解答】解：1.8×0.36=0.64835.37+28.63=6419.9﹣8.75=11.15 1.06×0.48=0.508818.9+28.65=47.5522.87﹣18.65=4.227．【解答】解：（1）7.6×0.82=6.232；（2）3.25×0.31=1.0075；（3）7.5×0.59=4.425．8．【解答】解：25.78+3.12=28.913.8×9=124.2*8﹣2.67=5.33验算：*5.73+6.7=12.43验算：9．【解答】解：4.8×17=81.6 1.88×25=47 2.4×0.37=0.8880.89×5.3=4.71710．【解答】解：3.8×0.15=0.57 4.6×50=2308.7×2.04=17.74813.2×9.8=129.360.86×0.72=0.61925﹣1.08=3.9211．【解答】解：2.375×105≈249.38 5.16×4.3≈22.190.45×0.206≈0.0912．【解答】解：4.8×0.25=1.29.3×1.3=12.099.8×0.5=4.9 2.1×2.15=4.51513．【解答】解：0.04×0.12=0.0048 4.25×8.8=37.43.84×0.25=0.95214．【解答】解：62.4+7.62=70.02 6.07﹣4.993=1.0778.7×1.4=12.18 1.28×3.5=4.4815．【解答】解：（1）8×0.125=1（2）4.23×5=21.15（3）36.5×4=146（4）25×0.126=3.15（5）18×1.8=32.4（6）33.42×20=668.416．【解答】解：2.3×0.8=1.84 6.9×3.1=21.399.87×1.8=17.76624.5×6.8=166.620.6×4.5=92.710.2×5.01=51.10217．【解答】解：2.02×2.4=4.84810.33﹣9.08=1.253.88+1.54=5.4218．【解答】解：3.5×7=24.58.1×16=129.6 3.27×21=68.67 5.63×36=202.68 4.32×7=30.2464×0.07=4.4819．【解答】解： 4.26×7.5=31.95 3.15× 1.4=4.4147.5×0.6=28.5 5.25×0.24=1.267.38×2.5=18.4514.24×0.35=4.984 1.21×8=9.68 2.4×0.2=0.480.57×0.43=0.245120．【解答】解：8.5×16=136； 4.15×24=99.6；0.32×7=2.24； 6.4×9=57.6； 2.5×36=90；0.04×270=10.8； 1.25×3=3.75； 3.75×6=22.5；21．【解答】解：0.56×0.04=0.0224验算：8.04×0.001=0.00804验算： 4.012×0.3=1.2036验算：0.42×0.08=0.0336验算：0.209×0.15=0.03135验算：4.8×0.0015=0.0072验算：87.5×2.4=210验算：10.28×0.7=7.196验算：31.4×3.8=119.32验算：22．【解答】解：0.82×2=1.64 3.95×42=165.9 2.073×15=31.0950.78×24=18.72 2.6×61=158.60.059×0.2=0.0118 4.268×1.7=7.255657×5.7=32.499.46×2.85=26.96117.8×6.4=113.92 1.5×4.9=7.35 2.5×0.88=2.223．【解答】解： 1.24×0.8=0.9920.85× 1.2=1.027.05×2.4=16.9212.3×2.4=29.5260.5×400=242089.3×7.6=678.6824．【解答】解：0.46×3.5=1.610.86×1.4≈1.200.036×2.5=0.098.4×1.03≈8.6525．【解答】解：25﹣12.54=12.46 1.59×2.4=3.8162137÷29≈73.726．【解答】解：1.5×0.2=0.3 1.25×0.8=1 4.5×0.4=1.82.5×7×0.4=70.3×0.3=0.090.35+0.75=1.10.48+1.62=2.110.1×78=787.827．【解答】解： 5.08×0.65=3.30254.68﹣12.8=41.8819.92+420.26=440.187.02×0.67=4.7034 28．【解答】解：4.8×2.5=12 5.07×0.29=1.47030.32×1.7≈0.54.08×6.7≈27.34 6.03×0.74≈4.4629．【解答】解：3.52×0.05≈0.18120.44×0.2≈24.098.25×1.4=11.558.76×3.5=30.66 4.25×0.4=1.7 2.7×1.6=4.3230．【解答】解：（1）0.43×27≈11.6（结果保留一位小数）（2）0.04×0.12=0.0048 （3）3.84×2.6≈10.0（保留一位小数）（4）5.76×3=17.28（5）8.3×0.15≈1.25（结果精确到百分位）（6）0.125×1.4≈0.18（保留两位小数）（7）4.8×0.25=1.231．【解答】解：0.38×0.25=0.095150×0.12=180.87×1.9=1.653 1.28×2.3=2.944 2.07×0.24=0.49680.17×1.05=0.178532．【解答】解：0.65× 4.7=3.055 2.06×9.4=19.3640.072×8.5=0.6129.9×0.99=9.801 2.04×0.8=1.63233．【解答】解：3.2×30=96 1.25×4=5 4.2×15=6311.5×108=12420.28×4.5=1.260.27×0.36=0.0972 2.6×3.8=9.88250×0.98=245 6.05×1.6=9.6810.8×2.07=22.35634．【解答】解：（1）0.54×2.7=1.458；（2）2.8×7.4=20.72；（3）15.4×0.7=10.78；（4）27.5×3.4=93.5．35．【解答】解：27.6×0.45=12.428.08﹣2.68=5.4 5.546+29.38=34.9260.023×1.8=0.248417.04×0.26=4.43048.35×3.5=29.225 5.08×0.25=1.27 1.18×3.4=4.01236．【解答】解：2.6×0.6=1.56 6.7×0.07=0.46915.6×1.3=20.280.81×2.7=2.18737．【解答】解：①3.65×2.6≈9.5②0.462÷ 2.8≈0.2③0.627+3.375≈ 4.0④4.35﹣0.435≈3.938．【解答】解：31.5×24.5=771.750.8×0.56=0.448 4.23×0.028=0.118440.63×1.05=0.661536×0.56=0.2016 2.5×2.05=5.12539．【解答】解：（1）2.3×0.29=0.667 2.7×1.02=2.754（2）0.45×0.96≈0.43 6.53×0.75≈4.90（3）10.6×0.26≈2.822.45×0.4≈9.040．【解答】解：0.34×2.5=0.85；1.5× 1.7=2.55；0.28×0.39=0.1092； 4.2×2.4=10.08．41．【解答】解：4.2×0.08=0.336 1.5×6.2=9.3 2.7×8.17=22.059 2.9×0.56≈ 1.62 6.23× 4.2≈26.242．【解答】解：①3.4×0.25=0.85②6.5×2.4=15.6③0.035×0.6=0.021④1.25×0.024=0.0343．【解答】解：84×0.25=210.55×64=35.20.47×5.8=2.726 6.06×0.32=1.93920.075×0.07=0.00525 3.7×9.77=36.14944．【解答】解：5.08×0.65=3.30254.68﹣12.8=41.8880.4×0.35=28.1419.92+420.26=440.1845．【解答】解：3.2×1.8=5.76 1.05×62=65.12.7×0.11=0.2970.12×0.18=0.02160.15×0.12=0.018 2.7×1200=324046．【解答】解：（1）7.6×0.82=6.232（2）3.5×8.8=30.8（3）3.25×0.31=1.0075（4）0.93×2.02≈1.88（5）5.9×3.14≈18.547．【解答】解：（1）1.2×1.36≈1.63 （2）2.7×0.34≈0.92 （3）0.74×5.8≈4.29（4）2.6×3.5=9.1验算：（5）0.25×0.12=0.03验算：48．【解答】解：18.8×38.2=718.16；48×0.952=45.696；35.7×5.06≈180.6；（得数保留一位小数） 6.928×3.2≈22.17；（得数保留两位小数）49．【解答】解：（1）0.86×7=6.02（2）3.3×16=52.8（3）0.48×2.4=1.152（4）1.7×0.45≈0.77（保留两位小数）50．【解答】解：0.38×0.25=0.095验算：1.07×2.1≈ 2.257.4× 2.84≈21.0 1.08×9.5=10.260.019×5.7=0.10830.75×1.02=0.765。

小数乘法计算600道第一部分一．计算题（共50小题）1．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25=2．用竖式计算下面各题．2.4×1.5= 0.46×8.7=（保留一位小数） 2.24×1.8=（保留两位小数）3．用竖式计算．（得数保留两位小数）3.35×1.7≈ 5.63×3.9≈4．用竖式计算．2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67=5．直接写得数．6.2×0.3= 2.5×0.8=0.06×5=0.16×25=5×2.1=0×48.76=6．用竖式计算（计算结果小数部分超过两位的，保留两位小数）．6.02×0.350.59÷1.4．7．按要求算一算．2.9×1.8 4.58×0.37 0.8×2.5（得数保留一位小数）5.45×1.72（得数保留两位小数）8．列竖式计算：1.8×0.85= 7.6﹣2.19= 50﹣18.75=9．用竖式计算．4.68×1.2= 1.58×2.5=10．竖式计算．1.35×270 6.4×8.05．11．用竖式计算．12．竖式计算．0.94×5.3= 0.91×2.6= 4.06×0.75（保留两位小数）≈8.43×1.5= 0.25×3.2= 7.8×0.9（保留一位小数）≈13．直接写出得数．0.25×4= 1.25×8=8.2×6.9×0=0.2×18= 6.29×100=0.02×500= 3.4×2=0.26×0.5= 14．我会口算．0.5×4.4=80÷1.6= 5.5÷0.11=0.06×5= 5×0.4×0.8=9.9+10.1= 1.25×0.8=0.08÷0.1= 4﹣0.15= 1.7×5+0.3×5=15．口算．3π=5π=5×3.14=0.5×7=92=62﹣32=4π﹣1.5π=34.6÷0.5=16．用竖式计算，得数保留一位小数．2.4×6.7≈3.5×0.5≈17．直接写出得数．0.8×25=0×4.23=0.57+0.43=2.4×0.2=0.02×500= 2.8×10=8.29×100= 2.5×0.4= 4.87﹣1.7=18．列竖式计算．0.64×12.5= 2.8×0.17=19．直接写出得数．0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5= 20．用竖式计算2.75×3.1= 3.18×5.45=0.76×2.18≈（得数保留两位小数）0.09×1.7≈（精确到十分位）21．列竖式计算0.36×0.15=（得数保留两位小数） 1.45×0.12=0.86×1.4=（得数保留一位小数） 6.5×0.39=22．用竖式计算．8×0.12= 1.9×3.5= 2.3×1.29=（验算）0.401×0.3=0.45×0.96=0.17×0.71=（得数保留两位小数）23．直接写得数．70×0.01= 2.515×10= 1.1×0.4=10﹢0.3= 6.5×0.2=0.1×0.01=0.87﹣0.6= 1.7×3=24．竖式计算．（得数保留一位小数）0.38×0.23 5.79×3.6 4.6×0.25．25．竖式计算．3.6×0.25= 9.8﹣1.64= 3.1×300=26．口算．0.7×0.5= 3.6×2=0.4×1.7= 4.5×6=0.36+9= 5.7+3= 6.6×2=0.1×3.1= 27．直接写出计算结果0.3×1.1= 5.79+2.31+4.21=0.25×4= 1.2÷0.4=1.5×0.6= 1.59÷0.3=0.5×101= 6.5﹣5=10﹣8.88﹣0.12=0.64÷1.6×1.5=28．直接写得数．0.6×0.7=0.8×5= 1.1×0.4=2.3×4×0=0.05×1.6=0.02×7=29．用竖式计算．0.32×0.8= 1.36×4.8= 17.3×0.06=30．用竖式计算．1.45×0.12= 3.08×0.28= 13.5×26.7= 3.15×0.35≈（保留一位小数）31．口算．9.37×0= 7.3×100= 289+72﹣89= 1﹣0.04= 4×8÷8×4=32．列竖式计算：30.5×0.76 0.54×0.19．33．直接写得数：2.5×33.06×2 0.25×44.2×105.3×100 2.5×62.2×4 1.6×4 1.25×834．竖式计算0.38×0.25= 0.12×15=8.5×0.39=（验算）0.87×1.5（保留二位小数）35．用竖式计算并验算．14.53+5.67 7.2﹣6.45 1.05×2.8 62.9÷1.7．36．口算：0.5×2=0.25×4=12.5×8=0.125×8=7÷0.7=1﹣0.125×8= 1.25×32=0.25×56=37．口算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5=38．竖式计算，带*的要验算*4.23×0.02836×0.5631.5×24.50.8×0.56*0.63×1.05 1.8×3.6739．竖式计算35.4×0.8 7.63×1.2 0.08×1.14 3.17×2.8（得数保留两位小数）0.3×5.6（得数保留一位小数）54.3×0.7（得数保留整数）40．列竖式计算24.6÷12 4.32÷1.2 21÷0.15．41．直接写出得数0×7= 2.6+0.4=15×0.01=21.2﹣21=1.8a+0.2a=0.4×0.4=2.5×4×0=0.72×0.8=42．口算．0.12×100= 6.2×10=500÷1000=12万+3万=8a+a= 6.2÷10=3.74×100=23.6÷100= 3.25×10=43．竖式计算0.18×12 3.26×15 3.1×17 1.25×4 14×0.5 8.4×15 0.45×9 1.5×35 0.02×13 4.28×16 2.61×1844．直接写出得数．40×1.2=25×0.4=63=7.8+0.9=0.56+4.44=2.4×0.5= 1.25×80=3.6÷0.06=12÷0.4=82=45．列竖式计算2.034×18 4.06×3.8 （积保留两位小数）46．计算4×38.2= 8×0.352= 35.6×5= 6.7×3=47．口算9.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4=35×0.4= 4.8×50= 4.8×0.25=8.8×5= 1.4×0.5=12.5×4= 48．竖式计算．☆0.43×27= 1.85×2.6=验算：49．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5=50．竖式计算．5.6×1.8= 0.25×0.046≈（保留两位小数）3500×0.96=第二部分一．计算题（共50小题）1．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75=1.06×0.48=18.9+28.65=22.87﹣18.65=2．用竖式计算下面各题．2.4×1.5= 0.46×8.7=（保留一位小数） 2.24×1.8=（保留两位小数）3．直接写得数．0.102×100= 4.2+3=0.23×0.5=0.25×7×0.4=3.6÷0.6=42=0.1÷0.01=2×0.5+1=4．用竖式计算（计算结果小数部分超过两位的，保留两位小数）．6.02×0.35 8.74÷3.8 0.59÷1.4．5．列竖式计算：1.8×0.85= 7.6﹣2.19= 50﹣18.75=6．用竖式计算．4.8×0.25 9.3×1.3 9.8×0.5 2.1×2.15．7．用竖式计算．（得数保留两位小数）3.35×1.7≈ 5.63×3.9≈8．直接写出得数．0.12×0.4= 3.8÷100=56.56÷0.56 1.6+3.04=19.28﹣0.8= 2.8÷0.7=0.53×1000=108÷2.5÷4=9．列竖式计算3.48×1.05（计算并验算） 1.55÷3.8（得数保留两位小数）10．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数） 4.865×8≈（保留整数）10.23×42≈（保留一位小数）11．直接写得数．6.2×0.3= 2.5×0.8=0.06×5=0.16×25=5×2.1=0×48.76=12．按要求算一算．2.9×1.8 4.58×0.370.8×2.5（得数保留一位小数） 5.45×1.72（得数保留两位小数）13．用竖式计算．84×0.25=0.55×64=0.47×5.8=6.06×0.32=0.075×0.07= 3.7×9.77=14．列竖式计算．3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.024．15．用竖式计算．2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67=17．竖式计算4.57×1.8 0.125×0.8 3.75×0.249.37×8.5 2.07×3.6 3.35×1.6．18．竖式计算．0.94×5.3= 0.91×2.6= 4.06×0.75（保留两位小数）≈8.43×1.5= 0.25×3.2= 7.8×0.9（保留一位小数）≈19．我会口算．0.5×4.4=80÷1.6= 5.5÷0.11=0.06×5= 5×0.4×0.8=9.9+10.1= 1.25×0.8=0.08÷0.1= 4﹣0.15= 1.7×5+0.3×5=20．列竖式计算，带*号的要验算．25.78+3.12= 13.8×9= *8﹣2.67= *5.73+6.7=21．直接写出得数．0.125×100=60÷100=9÷10=0.32+4.68= 15.7+4.3=25×4=10﹣0.8=7×99+7= 14.6+0.34=30.5+2.5=24﹣7.54﹣2.46=26+19+74+81= 22．用竖式计算．4.68×1.2= 1.58×2.5=23．用竖式计算，得数保留一位小数．2.4×6.7≈3.5×0.5≈24．竖式计算7.6×0.82= 3.25×0.31= 7.5×0.59=（验算）25．口算．3π=5π=5×3.14=0.5×7=92=62﹣32=4π﹣1.5π=34.6÷0.5= 26．直接写出得数．0.8×25=0×4.23=0.57+0.43= 2.4×0.2=0.02×500= 2.8×10=8.29×100= 2.5×0.4= 4.87﹣1.7= 27．列竖式计算．0.64×12.5= 2.8×0.17=28．列竖式计算4.8×17 1.88×25 2.4×0.37 0.89×5.3．29．列竖式计算．（得数保留两位小数）2.375×105 5.16×4.3 0.45×0.206．30．列竖式计算．0.04×0.12 4.25×8.8 3.84×0.25．31．竖式计算．3.6×0.25= 9.8﹣1.64= 3.1×300=32．用竖式计算2.75×3.1= 3.18×5.45=0.76×2.18≈（得数保留两位小数）0.09×1.7≈（精确到十分位）33．列竖式计算0.36×0.15=（得数保留两位小数） 1.45×0.12=0.86×1.4=（得数保留一位小数） 6.5×0.39=34．用竖式计算．8×0.12= 1.9×3.5= 2.3×1.29=（验算）0.401×0.3=0.45×0.96=0.17×0.71=（得数保留两位小数）35．直接写出得数．0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5=36．列竖式计算：30.5×0.76 0.54×0.19．37．竖式计算．1.35×270 6.4×8.05．38．直接写得数．70×0.01= 2.515×10= 1.1×0.4=10﹢0.3= 6.5×0.2=0.1×0.01=0.87﹣0.6= 1.7×3=39．列竖式计算24.6÷12 4.32÷1.2 21÷0.15．40．2.6+0.4=直接写出得数．0×7=15×0.01=21.2﹣21=1.8a+0.2a=0.4×0.4=0.12×0.04=0.8×100=2.5×4×0=0.72×0.8=41．竖式计算．（得数保留一位小数）0.38×0.23 5.79×3.6 4.6×0.25．42．用竖式计算．0.32×0.8= 1.36×4.8= 17.3×0.06=43．竖式计算（*验算）8.4×0.15= 16.51﹣6.3= 900﹣4.58= *56.7+0.33=44．口算．0.7×0.5= 3.6×2=0.4×1.7= 4.5×6=0.36+9= 5.7+3= 6.6×2=0.1×3.1= 45．用竖式计算．1.45×0.12= 3.08×0.28= 13.5×26.7=3.15×0.35≈（得数保留一位小数）46．竖式计算0.38×0.25= 0.12×15=8.5×0.39=（验算）0.87×1.5 （得数保留二位小数）47．直接写出计算结果0.3×1.1= 5.79+2.31+4.21=0.25×4= 1.2÷0.4=1.5×0.6= 1.59÷0.3=0.5×101= 6.5﹣5= 10﹣8.88﹣0.12=0.64÷1.6×1.5=48．竖式计算0.38×0.25 150×0.12 0.87×1.91.28×2.3 2.07×0.24 0.17×1.0549．用竖式计算．8×0.12=（验算） 1.9×3.5=（验算）0.401×0.3= 0.45×0.96= 0.17×0.71=50．直接写出得数．0.13×0.2=1﹣0.9=0.32÷2=0.8×5=0.9×0.1= 3.11+2.22=0.52=8m﹣6m=1.62﹣0.62= 5.9+4.4=0.053×100=12.5+12.5×7=第一部分参考答案与试题解析一．计算题（共50小题）1．【解答】解：0.4×0.02=0.0081.8×0.4=0.726×0.25=1.5 1.25×0.8=13﹣0.98=2.020.9÷0.01=903.9×0.01=0.03999×0.25=24.752．【解答】解：（1）2.4×1.5=3.6（2）0.46×8.7≈4.0（3）2.24×1.8≈4.033．【解答】解：3.35×1.7≈5.70 5.63×3.9≈21.964．【解答】解：2.97×3.5=10.395 6.05×0.83=5.02150.78×4.5=3.51 3.36×3.67=12.33125．【解答】解：6.2×0.3=1.862.5×0.8=20.06×5=0.30.16×25=45×2.1=10.50×48.76=06．【解答】解：6.02×0.35≈2.118.74÷3.8=2.30.59÷1.4≈0.427．【解答】解：2.9×1.8=5.22 4.58×0.37=1.69460.8×2.5=2.0 5.45×1.72≈9.378．【解答】解：1.8×0.85=1.537.6﹣2.19=5.4150﹣18.75=31.259．【解答】解：4.68×1.2=5.616 1.58×2.5=3.9510．【解答】解：1.35×270=368.5 6.4×8.05=51.5211．【解答】解：（1）36×5.5=198；（2）18×3.06=55.08；（3）3.45×21=72.45；（4）0.28×0.25=0.07；（5）150×0.12=18；（6）0.87×1.5=1.305；（7）0.4×0.076=0.0304；（8）1.5×0.062=0.093；（9）6.5×0.04=0.26．12．【解答】解：（1）0.94×5.3=4.982；（2）0.91×2.6=2.366；（3）4.06×0.75≈3.05；（4）8.43×1.5=12.645；（5）0.25×3.2=0.8；（6）7.8×0.9≈7.0．13．【解答】解：0.25×4=1 1.25×8=108.2×6.9×0=00.2×18=3.66.29×100=6290.02×500=103.4×2=6.80.26×0.5=0.1314．【解答】解：0.5×4.4=2.280÷1.6=50 5.5÷0.11=500.06×5=0.35×0.4×0.8=1.69.9+10.1=20 1.25×0.8=10.08÷0.1=0.84﹣0.15=3.85 1.7×5+0.3×5=1015．【解答】解：3π=9.425π=15.75×3.14=15.70.5×7=3.592=8162﹣32=274π﹣1.5π=7.8534.6÷0.5=69.216．【解答】解：2.4×6.7≈16.1 3.5×0.5≈1.817．【解答】解：0.8×25=20×4.23=00.57+0.43=12.4×0.2=0.480.02×500=102.8×10=288.29×100=8292.5×0.4=1 4.87﹣1.7=3.1718．【解答】解：（1）0.64×12.5=8（2）2.8×0.17=0.47619．【解答】解：0.7××0.3=0.0425.5×10=552.6×0.5=1.3．20．【解答】解：（1）2.75×3.1=8.525（2）3.18×5.45=17.331（3）0.76×2.18≈1.66（得数保留两位小数）（4）0.09×1.7≈0.2（精确到十分位）21．【解答】解：0.36×0.15≈0.05 1.45×0.12=0.1740.86×1.4≈0.1 6.5×0.39=2.53522．【解答】解：8×0.12=0.96 1.9×3.5=6.65 2.3×1.29=2.9670.401×0.3=0.12030.45×0.96=0.4320.17×0.71≈0.1223．【解答】解：70×0.01=0.72.515×10=25.151.1×0.4=0.4410﹢0.3=10.36.5×0.2=1.30.1×0.01=0.0010.87﹣0.6=0.271.7×3=5.124．【解答】解：0.38×0.23≈0.1 5.79×3.6≈20.8 4.6×0.25≈1.225．【解答】解：3.6×0.25=0.99.8﹣1.64=8.16 3.1×300=93026．【解答】解：0.7×0.5=0.353.6×2=7.20.4×1.7=0.684.5×6=270.36+9=9.36 5.7+3=8.7 6.6×2=13.20.1×3.1=0.3127．【解答】解：0.3×1.1=0.33 5.79+2.31+4.21=12.310.25×4=1 1.2÷0.4=31.5×0.6=0.9 1.59÷0.3=5.30.5×101=50.56.5﹣5=1.510﹣8.88﹣0.12=10.64÷1.6×1.5=0.628．【解答】解：0.6×0.7=0.420.8×5=4 1.1×0.4=0.442.3×4×0=00.05×1.6=0.080.02×7=0.1429．【解答】解：0.32×0.8=0.256 1.36×4.8=6.52817.3×0.06=1.03830．【解答】解：1.45×0.12=0.174 3.08×0.28=0.862413.5×26.7=360.45 3.15×0.35≈1.131．【解答】解：9.37×0=07.3×100=730289+72﹣89=2721﹣0.04=0.964×8÷8×4=1632．【解答】解：30.5×0.76=23.180.54×0.19=0.102633．【解答】解：2.5×3=7.53.06×2=6.12 0.25×4=14.2×10=425.3×100=5302.5×6=152.2×4=8.8 1.6×4=6.4 1.25×8=1034．【解答】解：0.38×0.25=0.0950.12×15=1.88.5×0.39=3.3150.87×1.5≈1.3135．【解答】解：①14.53+5.67=20.2②7.2﹣6.45=0.75③1.05×2.8=2.94验算：④62.9÷1.7=37验算：36．【解答】解：0.5×2=10.25×4=112.5×8=1000.125×8=17÷0.7=101﹣0.125×8=01.25×32=800.25×56=1437．【解答】解：0.2×0.4=0.088.2+1.8=106.45×0.01=0.06452.5×0.4=10.8×50=40 2.4×5=120.9﹣0.52=0.2810.2×4.5=45.938．【解答】解：*4.23×0.028=0.1184436×0.56=20.1631.5×24.5=771.750.8×0.56=0.448*0.63×1.05=0.6615 1.8×3.67=6.60639．【解答】解：35.4×0.8=28.327.63×1.2=9.1560.08×1.14=0.0912 3.17×2.8≈8.88；0.3×5.6≈1.754.3×0.7≈440．【解答】解：24.6÷12=2.05 4.32÷1.2=3.621÷0.15=14041．【解答】解：0×7=0 2.6+0.4=315×0.01=0.1521.2﹣21=0.21.8a+0.2a=2a0.4×0.4=0.160.12×0.04=0.00480.8×100=802.5×4×0=00.72×0.8=0.57642．【解答】解：0.12×100=12 6.2×10=62500÷1000=0.512万+3万=15万8a+a=9a 6.2÷10=0.623.74×100=37423.6÷100=0.2363.25×10=32.543．【解答】解：（1）0.18×12=2.16（2）3.26×15=48.9 （3）3.1×17=52.7（4）1.25×4=5（5）14×0.5=7（6）8.4×15=126（7）0.45×9=4.05 （8）1.5×35=52.5（9）0.02×13=0.26 （10）4.28×16=68.48（11）2.61×18=46.9844．【解答】解：40×1.2=4825×0.4=1063=2167.8+0.9=8.70.56+4.44=52.4×0.5=1.21.25×80=1003.6÷0.06=6012÷0.4=3082=6445．【解答】解：①2.034×18=36.612②4.06×3.8≈15.4346．【解答】解：4×38.2=152.88×0.352=2.81635.6×5=178 6.7×3=20.147．【解答】解：9.5×0.2=1.93.2×0.5=1.60.8×2.5=24.4×0.4=1.7635×0.4=144.8×50=2404.8×0.25=1.28.8×5=441.4×0.5=0.712.5×4=5048．【解答】解：0.43×27=11.61； 1.85×2.6=4.81；0.37×2.4≈0.9（得数保留一位小数）；7.02×0.56≈3.93（得数保留两位小数）；49．【解答】解：0.7×0.9=0.63 2.6×0.5=1.30.14×0.3=0.0425.5×10=551.7×0.03=0.0511.8×0.04=0.0720.12×6=0.72 4.8×5=2450．【解答】解：5.6×1.8=10.08 0.25×0.046≈0.013500×0.96=3360第二部分参考答案与试题解析一．计算题（共50小题）1．【解答】解：1.8×0.36=0.64835.37+28.63=6419.9﹣8.75=11.15 1.06×0.48=0.508818.9+28.65=47.5522.87﹣18.65=4.222．【解答】解：（1）2.4×1.5=3.6（2）0.46×8.7≈4.0（3）2.24×1.8≈4.033．【解答】解：0.102×100=1024.2+3=7.20.23×0.5=0.1150.25×7×0.4=0.73.6÷0.6=642=160.1÷0.01=102×0.5+1=24．【解答】解：6.02×0.35≈2.118.74÷3.8=2.30.59÷1.4≈0.425．【解答】解：1.8×0.85=1.537.6﹣2.19=5.4150﹣18.75=31.256．【解答】解：4.8×0.25=1.29.3×1.3=12.099.8×0.5=4.9 2.1×2.15=4.5157．【解答】解：3.35×1.7≈5.70 5.63×3.9≈21.968．【解答】解：0.12×0.4=0.048 3.8÷100=0.03856.56÷0.56=101 1.6+3.04=4.6419.28﹣0.8=18.482.8÷0.7=40.53×1000=530108÷2.5÷4=10.89．【解答】解：3.48×1.05=3.654验算： 1.55÷3.8≈0.4110．【解答】解：0.64×18=11.5225.8×102=2631.640.7×0.25=10.17513.45×2.6≈35 4.865×8≈3910.23×42≈429.711．【解答】解：6.2×0.3=1.862.5×0.8=20.06×5=0.30.16×25=45×2.1=10.50×48.76=012．【解答】解：2.9×1.8=5.22 4.58×0.37=1.69460.8×2.5=2.0 5.45×1.72≈9.3713．【解答】解：84×0.25=210.55×64=35.20.47×5.8=2.726 6.06×0.32=1.93920.075×0.07=0.00525 3.7×9.77=36.14914．【解答】解：①3.4×0.25=0.85②6.5×2.4=15.6③0.035×0.6=0.021④1.25×0.024=0.0315．【解答】解：2.97×3.5=10.395 6.05×0.83=5.02150.78×4.5=3.51 3.36×3.67=12.331216．【解答】解：（1）36×5.5=198；（2）18×3.06=55.08；（3）3.45×21=72.45；（4）0.28×0.25=0.07；（5）150×0.12=18；（6）0.87×1.5=1.305；（7）0.4×0.076=0.0304；（8）1.5×0.062=0.093；（9）6.5×0.04=0.26．17．【解答】解：（1）4.57×1.8=8.226；（2）0.125×0.8=0.1；（3）3.75×0.24=0.9；（4）9.37×8.5=79.645；（5）2.07×3.6=7.452；（6）3.35×1.6=5.36．18．【解答】解：（1）0.94×5.3=4.982；（2）0.91×2.6=2.366；（3）4.06×0.75≈3.05；（4）8.43×1.5=12.645；（5）0.25×3.2=0.8；（6）7.8×0.9≈7.0．19．【解答】解：0.5×4.4=2.280÷1.6=50 5.5÷0.11=500.06×5=0.35×0.4×0.8=1.69.9+10.1=20 1.25×0.8=10.08÷0.1=0.84﹣0.15=3.85 1.7×5+0.3×5=1020．【解答】解：25.78+3.12=28.913.8×9=124.2*8﹣2.67=5.33验算：*5.73+6.7=12.43验算：21．【解答】解：0.125×100=12.560÷100=0.69÷10=0.90.32+4.68=515.7+4.3=2025×4=10010﹣0.8=9.27×99+7=70014.6+0.34=14.9430.5+2.5=3324﹣7.54﹣2.46=1426+19+74+81=20022．【解答】解：4.68×1.2=5.616 1.58×2.5=3.9523．【解答】解：2.4×6.7≈16.1 3.5×0.5≈1.824．【解答】解：（1）7.6×0.82=6.232；（2）3.25×0.31=1.0075；（3）7.5×0.59=4.425．25．【解答】解：3π=9.425π=15.75×3.14=15.70.5×7=3.592=8162﹣32=274π﹣1.5π=7.8534.6÷0.5=69.226．【解答】解：0.8×25=20×4.23=00.57+0.43=12.4×0.2=0.480.02×500=102.8×10=288.29×100=8292.5×0.4=1 4.87﹣1.7=3.1727．【解答】解：（1）0.64×12.5=8（2）2.8×0.17=0.47628．【解答】解：4.8×17=81.6 1.88×25=47 2.4×0.37=0.8880.89×5.3=4.71729．【解答】解：2.375×105≈249.38 5.16×4.3≈22.190.45×0.206≈0.0930．【解答】解：0.04×0.12=0.0048 4.25×8.8=37.4 3.84×0.25=0.95231．【解答】解：3.6×0.25=0.99.8﹣1.64=8.16 3.1×300=93032．【解答】解：（1）2.75×3.1=8.525（2）3.18×5.45=17.331（3）0.76×2.18≈1.66（得数保留两位小数）（4）0.09×1.7≈0.2（精确到十分位）33．【解答】解：0.36×0.15≈0.05 1.45×0.12=0.1740.86×1.4≈0.1 6.5×0.39=2.53534．【解答】解：8×0.12=0.96 1.9×3.5=6.65 2.3×1.29=2.9670.401×0.3=0.12030.45×0.96=0.4320.17×0.71≈0.1235．【解答】解：0.7××0.3=0.0425.5×10=552.6×0.5=1.3．36．【解答】解：30.5×0.76=23.180.54×0.19=0.102637．【解答】解： 1.35×270=368.56.4×8.05=51.5238．【解答】解：70×0.01=0.72.515×10=25.151.1×0.4=0.4410﹢0.3=10.36.5×0.2=1.30.1×0.01=0.0010.87﹣0.6=0.271.7×3=5.139．【解答】解：24.6÷12=2.05 4.32÷1.2=3.621÷0.15=14040．【解答】解：0×7=0 2.6+0.4=315×0.01=0.1521.2﹣21=0.21.8a+0.2a=2a0.4×0.4=0.160.12×0.04=0.00480.8×100=802.5×4×0=00.72×0.8=0.57641．【解答】解：0.38×0.23≈0.1 5.79×3.6≈20.8 4.6×0.25≈1.242．【解答】解：0.32×0.8=0.256 1.36×4.8=6.52817.3×0.06=1.03843．【解答】解：8.4×0.15=1.2616.51﹣6.3=10.21900﹣4.58=895.42*56.7+0.33=57.0344．【解答】解：0.7×0.5=0.353.6×2=7.20.4×1.7=0.684.5×6=270.36+9=9.36 5.7+3=8.7 6.6×2=13.20.1×3.1=0.3145．【解答】解：1.45×0.12=0.174 3.08×0.28=0.862413.5×26.7=360.45 3.15×0.35≈1.146．【解答】解：0.38×0.25=0.0950.12×15=1.88.5×0.39=3.3150.87×1.5≈1.3147．【解答】解：0.3×1.1=0.33 5.79+2.31+4.21=12.310.25×4=1 1.2÷0.4=31.5×0.6=0.9 1.59÷0.3=5.30.5×101=50.56.5﹣5=1.510﹣8.88﹣0.12=10.64÷1.6×1.5=0.648．【解答】解：0.38×0.25=0.095150×0.12=180.87×1.9=1.653 1.28×2.3=2.944 2.07×0.24=0.49680.17×1.05=0.178549．【解答】解：①8×0.12=0.96② 1.9× 3.5=6.65③0.401×0.3=0.1203④0.45×0.96=0.432⑤0.17×0.71=0.120750．【解答】解：0.13×0.2=0.0261﹣0.9=0.10.32÷2=0.160.8×5=40.9×0.1=0.09 3.11+2.22=5.330.52=0.258m﹣6m=2m1.62﹣0.62=1 5.9+4.4=10.30.053×100=5.312.5+12.5×7=100。