五年级数学上册《小数乘法》简便计算及口算练习题

五年级数学上册《小数乘法》简便计算及口算练习题1)8.2×99+8.2=8.2×（99+1)=8.2×100=8202)8.8×12.5=（8+0.8)×12.5=100+10=1103)12.5×3.4×0.8=12.5×0.8×3.4=10×3.4=344)0.78×9.9=0.78×（10-0.1)=0.78×10-0.78×0.1=7.8-0.078=7.7225)16×12.5×4.3=2×8×12.5×4.3=（2×4.3)×（8×12.5)=8.6×100=8606)0.34×101

=0.34×（100+1)

=0.34×100+0.34

=34+0.34

=34.34

7)3.78×0.8+3.78×0.2

=3.78×（0.8+0.2)

=3.78×1

=3.788)8.57×103-8.57×3

=8.57×（103-3)

=8.57×100

=8579)5×0.2×8×1.25

=（5×0.2)×（8×1.25)

=1×10

=1010)4.5×13.6+55×1.36=45×1.36+55×1.36=（45+55)×1.36=100×1.36=13611)4.86×99

=4.86×（100-1)

=4.86×100-4.86

=486-4.86

=481.4412)0.43×102=0.43×（100+2)=0.43×100+0.43×2=43+0.86=43.8613)0.5×7.6×20

=（0.5×20)×7.6

=10×7.6

=76

14)90.5×99+90.5

=90.5×（99+1)

=90.5×100

=905015)0.25×16.2×4=0.25×4×16.2=1×16.2=16.216)7.09×10.8-0.8×7.09=7.09×（10.8-0.8)=7.09×10=70.917)8.37×1.4+8.6×8.37=8.37×（1.4+8.6)=8.37×10=83.718)0.78×16.5-0.78×15.5=0.78×（16.5-15.5)=0.78×1=0.7819)76×0.3+5.24×0.3+0.3=0.3×（76+5.24+1)=0.3×82.24=24.67220)76.1×17-76.1×7=76.1×（17-7)=76.1×10=76121)3.6×10.1=3.6×（10+0.1)=3.6×10+3.6×0.1=36+0.36=36.3622)7.5×2.3+0.25×23=2.3×（7.5+2.5)=2.3×10=2323)1.25×3.2×0.8=1.25×0.8×3.2=1×3.2=3.224)9.8×5.6+9.8×4.4=9.8×（5.6+4.4)=9.8×10=98《小数乘法》口算练习题19×3.5＝66.51×17.4＝17.46×16.7＝100.22×12.5＝252×10.2＝20.418×0.1＝1.85×17.4＝874×19.5＝781×11.3＝11.32×9.9＝19.81×12.8＝12.86×9.6＝57.63×6.5＝19.50×20.2＝05×9.5＝47.511×6.8＝74.819×0.7＝13.310×7.3＝735×9.4＝473×14.7＝44.13×14.1＝42.310×5.4＝546×10.2＝61.20×16.8＝013×7.5＝97.59×2.8＝25.24×13.4＝53.610×7.6＝761×19.3＝19.35×4.1＝20.512×0.3＝3.63×17.6＝52.84×8.4＝33.67×0.5＝3.54×15.7＝62.85×19.7＝98.53×4.5＝13.53×17.5＝52.53×6.1＝18.34×12.6＝50.48.2×2＝16.411.4×7＝79.89.9×5＝49.50.7×18＝12.67.9×5＝39.517.2×4＝68.86.5×14＝916.4×0＝02.1×17＝35.73.3×6＝19.88.4×0＝03.5×20＝706.7×8＝53.63.3×17＝56.12.3×17＝39.120.2×0＝04.6×10＝464.1×3＝12.316.4×4＝65.64.1×17＝69.713.6×4＝54.41.3×14＝18.24.2×6＝25.23.2×14＝44.812.3×8＝98.41.8×10＝188.2×7＝57.44.7×18＝84.62.1×2＝4.21.8×16＝28.810.9×2＝21.83.1×11＝34.110.2×9＝91.80.4×9＝3.69.3×6＝55.8《小数乘法》口算练习题5.1×12＝61.220.7×2＝41.418.3×4＝73.22.8×7＝19.68.6×11＝94.60.2×16＝3.23.7×13.7＝50.690.8×8.6＝6.888.1×2.5＝20.2510.3×0.4＝4.125.6×4.9＝27.444.4×3＝13.21.1×18.6＝20.461×3.9＝3.96.1×10.9＝66.4911.6×6＝69.60.9×2.3＝2.076×0＝09×10.5＝94.52.2×15.3＝33.660.1×1.3＝0.131.8×20.4＝36.721.3×13.2＝17.164.9×8.8＝43.122.2×17.9＝39.387.3×11.9＝86.8712.9×6.3＝81.2718.8×3.4＝63.920.3×19.9＝5.977.8×4.9＝38.220.2×19.6＝3.929.6×4.8＝46.082.1×12.3＝25.833.1×19.9＝61.692.5×12.4＝312.8×19＝53.28.6×6.9＝59.344.2×6.8＝28.561.2×20.6＝24.7212.6×1.4＝17.641.6×12.7＝20.321.6×16.9＝27.0414.5×2.4＝34.811.6×0.8＝9.280.6×19.8＝11.884.9×18.55＝90.8950.84×19.3＝16.2128.5×10.86＝92.312.3×14.27＝32.8214.3×17.86＝76.79816.8×2.84＝47.71213.2×1.24＝16.3688.31×10.3＝85.59320.4×4.43＝90.3724.27×20.5＝87.53511.2×6.4＝71.686.52×0.1＝0.65217.6×5.49＝96.6247.53×10.4＝78.3121.8×16.65＝29.976.5×11.16＝72.5413.97×7＝97.792.95×7.8＝23.017.3×11.64＝84.9724.4×7.16＝31.50