小数点乘法口算练习题

精品文档 小数点乘法口算练习题 8.5×100= .5? 1.7=.2?100= 1.2?0.= 1.5× 4=2.5×4= 0.13×=.4?10= 0.18×0.3=.2×1000= 0.45?0.15=3.6?0.1= 0.49?7=0 .04×25= 0.096?0.03= 4?4.2=1000×0.756=0.5×100= 0?0.25=1?0.01= 1.25×8=.3?0.3=0.9×6=.10.24×5= 0.20.05×1.6= 0.51.25×4=?0.5= 0.320.92?4=01.6?0.8= .34.2?1.4= .90.4×0.25, 0.8×7,1.50.7×8,10.33.21×23,.2132.1×0.23, .210.9×0.3,.510×0.05, 0.130.7×4,0.0512.5×8, .30.4×50, 04.1×2, 0.350.9×0.3, 11.25×8, 12.05×100,0.041.25×8, 1.60.2×0.4,.22.5×0.4,.43.8×2= ?0.4= ×0.3= ×0.5= 0×1.1= 0.8×0.25=0.4?16=2.5?1.6=6.2?9=0.15?3.9= 0×7 , 1.32×2,×2.3,.1×0.23,×0.2,2.01×7, 0.21×4,×4, .25×0.1,.6×0.2, .5×0.06,,0.73 , 0.6×0.3, 0.4×5, 0.9，1.8,100×5, 0.227.2?0.9= 0.45?0.5=×0.08=1.87×0.5= ×0.5= ?8= 1.8?10=6.3，1.7= 0.56×8=.2?6.81= 1 / 13 精品文档 ×8, ×0.6, ×2.3, ×0.023, ×0, ×100, ×0.3,×0, ×3,×0.1, ×0.5,×8, ×0.25, ，1.4, ,35.22, ×4, 1.6×0.2= 0.2?0.01= ×0=?0.12= ×0.5=?2.1= ?14= ?0.6= 1.47×0.4=21 0.9,0.52,3.99×1, 0×3.52,.2?6,4.4?4, .6?3,.2?2,1.5×3, 1.2×0.4,.6?3,2.7?3, 0.12?3,0.45?9, .6?6, .7?2, 1.2?, 0.45?4,.5?5,8.4?7,0.34?17,2.5?0.5,.4?0.7, 0.34?0.17,0.4?4, 1.2×6,0.72?0.6, .6?1.3, 0.6×0.3, 0?3.65,.82?1 ,1.4?0.7,.60.48?0.8,4.40.3?0.01,40.9?0.45,9.63?4 , .13.6，6.3, 0.051,0.08, .53.9，0.39,4.86.4?4,1.5 2.5×2= 0.5×10= 0.6×8=2.1×2=2.8×10=0.7×0.8= 0.04×20= .6+0.4=4.7+2.3=.5×2= .9,2.5=.2×0.8= 2 / 13 精品文档 ×3.4= 0.62,0.32= 1.4×0.5= 0.75×100=0.02×0.5= .6×0.3= 0.75?0.25= 0.125×8=.8?0.3= 0.86?2=0.56?28=0.36?0.4=0.64?0.8= 0.7×9=3.6?24= 0.8×1.1=.2+12.8=.7,12.8?4=.2?13= 12.5?5= 1.64+4.1=10?20= .08×0.01=4.95×1000= .9×0.1=0.4×0.5=2.4?0.8= 10.8?9= .6?0.8= 0.108?2=4.95?0.9=.65?0.1=0.325×100=2.5×8=0.6?0.7=0.125×4=3.28×0.1=3.9?0.7.2×0.1= 0.01×0.1= 0.25×0.4= 1.6?0.8=1?2.5=1.25×0.8=.2?0.04= 0?1.7=0.22×102= .6?0.8=×0.24= .5,3.9?0.1 16.5?0.5=×0.12=24×0.5=4.8×0.5= .8， 7.8?0.01= .4?0.6= .2?5= ×0.62=0.56?0.8= .4,2.8= 0.18?0.2=0.16?8=4.5×0.02= ，7.2= 1.2×30=0.012×0.2=7.3×0.3= 0?6= .6?0.12= .8?0.6=2?5=4.5?0.06, .6?0.9, ?0.11, .2×, ?0.5,.1?0.17, ?16, 1?0.01 ,?9, .5×4, ×4,.5×0, ×0.01, 1.25?0.25 , ，5.2,0.5×0., ?0.3,4.2×3, 6.3?7=.6×100=3.8= 4?15=8.65×10=0.35×0.6= 13=0.05= .2= 0.84?2.1= ?0.25= ，5= 0.3?0.6= 3 / 13 精品文档 0.96?0.2= 10.5×0.4= .3，0.27= ×0.125= 0.54?0.6= 0.61，0.39= 0.56?28=10?20=4.08?0.4=10, 9.4=0.8×0.11=7.2，12.8=5.6?0.01=.3×100= 0.75×100=0.108?2= 10.8?9=.8?0.01= .4?0.6= ?5= ×0.62= 12?0.5=5.2×0.4= 12.2?0.2=.6?100= 0.41，3.7= 0.02×0.5=.2,0.8= 1.4×0.5=4?0.21= 0.75?0.25= .5×16=0.108?2= 1.75，32.5=16, 5.07=.2?13=1.64?41= 1.02×0.2= 0.26×0.3=.4×0.02= 1.2×6= 0.8×0.05= 12.6?0.03=8.71?0.1= 1?0.21=0.8×0.13= 0.34?17= .08?0.4=0.5×2.2=1.24×4= .27， 5.6?7=72?.2= 0.7?0.35= 0.7?1.40.48?0.04=1.25?2.5= .5，5.5= 16.8?8=0.54，2.2=.51.5×0.6= 0.32?0.8= 12.25?0.5=3.5×0.46.5，52.5= 0.45×102= 1.25×88= .64， 8×1.25=7?3.5=4.2?0.7?6= 0.4×8.6×25=0.27?0.3=2.5×101= 0.65×101,0.65= .6×7?2.6×7=0.02×0.5= .6×0.3=.3?7=.6×100=7.8?0.01=.4?0.6= 1.5×0.6= 0.32?0.8= 12.25?0.5=3.5×0.1=2.5×2=0.5×10= 0.6×8=2.1×2=0.61，0.39= 0.56?28=10?20=4.08?0.4= 4 / 13 精品文档 1.2×0.= .6?1.1 =4.9?7= 0?0.48= 0.63=.02×0.3= 0.3×0.5= ,0.05=?0.02=0.25×40= 1= 3.85，1.54=3.2?5= ×0.62= 26(4×4=+++ 2、把3.67扩大10倍是，扩大100倍是，扩大1000倍是。 3、把560缩小10倍是，缩小100倍是，缩小1000倍是。 二、计算 1、直接写出得数 6.5×10= 0.56×100=.78×100= 3.215×100= 0.8×10=4.08×100= 2、用竖式计算 4.6×6=8.9×7= 15.6×13= 0.18×15=0.025×14=3.06×36= 三、根据13×3=39，很快说出下面各题的积。 130×3=13×30= 1.3×3= 1300×3=130×30= 0.13×3= 1、不计算，在里填上>、 198×0.819895×0.5 168×1.5168132×4.132 2、先计算下面的前三道题，然后仔细观察，找出规 5 / 13 精品文档 律，再把其它算式补充完整，并直接写出得数。 1. 3×9= 1. 34×9= 1. 345×9= ×9= ×9= 3. × 1 6 356 小数乘小数 数小数位数时一定要仔细哟! 一、填空 1、6(3×16(789的积里有位小数。 2、根据47×14=658，直接写出下面各题的积。 0.47×14= .7×14=0.47×1.4= 47×0.14= 0.47×0.14=70×0.014= 3、在里填上>、 196×0(8196×2.55 0.78×1.10.7.2×0.9.2 若A×0.56>0.56，则A1。 若B×0.42 二、判断题 6 / 13 精品文档 乘数比1小时，积一定小于被乘数。 一个数的1.5倍一定比原数大。 一个两位小数乘一个一位小数，积的小数位数最多是三位小数。 4.37×3.8=166.06 列竖式计算小数乘法时，应把因数中的小数点对齐。 三、计算下面各题 31.5×24.50.8×0.56.23×0.028 0.63×1.0536×0.5 0.32×0.2 1、0.6的十分之五是多少, 2、1千克面粉可磨面粉0.85千克，53.5千克小麦可磨面粉多少千克, 3、在里填上适当的数字。 当A为何值时，下面等式成立: 2.6×1.5+A×1.5+0.15×34=76×0.15 积的近似数 记得要“四舍”“五入”哟! 一、填空: 1、6(9628保留整数是;保留到十分位是;保留两位小数是;保留三位小数是 2、求一个小数的近似数，如果保留三位小数，要看小数第位。、4.3×0.83的积是，保留两位小数后约是。 7 / 13 精品文档 4、一个两位小数用四舍五入法保留一位小数后得到3.0，这个数最大可能是，最小可能是。 二、判断题。 1、 近似值4.0和4的大小相等，精确度一样。 2、 .995精确到百分位是8。 3、 一个自然数乘小数，积一定比这个自然数小。 4、两个数的积保留两位小数的近似值是2.16，这个准确数可能是 2.156 三、计算 1、得数保留一位小数。 3.58×20.5×0. 0.37×2.4 2、得数保留两位小数。 35.6×0.50.728×3.24.3×0.23 1、蒙古牛一般体重约320千克，草原红牛体重约是蒙古牛体重的1.32倍，草原红牛的体重约是多少千克, 2、甲乙两人共同生产一批零件，甲每小时生产28.5个，乙每小时生产35个，甲在中路途因为修理机器耽误了一小时，5小时后，这批零件全部生产完，这批零件一共有多少个, 有16个教授，有人带1个研究生，有人带2个研究生，也有人带3个研究生，他们共带了27个研究生，其中 8 / 13 精品文档 带1个研究生的教授人数和带2个和3个研究生的教授总数 一样多，问带2个研究生的教授有 1.5×4= .5×4= 0.13×4=0.5= 0.05×1.6= 0.5×1.1= 5.4?10=0.45?0.15=.5? 1.7= 0.49?7=84?4.2= 0?0.25=3.8×2=.3?0.3=0.2?0.01= 0.3= 0.24×5=0.18×0.3= .2×1000=.6?0.1=.5×100= .2?100= 1.2?0.=0 .04×25= 0.096?0.03= 1000×0.756=0.5×100= 1?0.01=1.25×8= .2?0.9= 1.6×0.2=?0.4= 0.45?0.5= 0.9×6=.1× 7×0.08=1.87×0=0.2×0.5= 0× 0.8× 0.5= = 1.8× 0.5= ? 16= 0.9? = 0.5? 14=0.1× = .2? 1.4= 1.47×0.4= 1.5× ,0.7×8,?0.12=×0.25=8?0.5=2.5?10=80?1.6= 1.6?0.8=7.2?0.6= 3.9?3.9= 0.4×0.25, 1.32×8, 10.3×2, 1.25× 0.4?8=0.36.3?2.1= .2，1.7=6.3?9= 0?6.81=0.8×7,5× 3.21×23,.21×2.3,.1×2.3, 32.1×0.23, .21×0.23,21×0.1, 0.9×0.3, 1×0.06,×0.5, 9 / 13 精品文档 0.023, 0.9×0.3, ×0, 10×0.05, ×100, 0.7×4, 0.3, 12.5×8,×0, 0.4×50,×3, 3.5×0.2,0.13×7, 0.05×4,.3×4,30×0.1 , .01 0.21 × .252.61.25×8, ×8, 2.05×100, 0.25, 1.25×8,，1.4, 0.2×0.4,35.22, 2.5×0.4, ×4, 0.9,0.52, 1,0.73, 0.04×0.3, 1.6×5,.2，1.8, .4×5,3.99×1,0.0.4× 0.9100, 0.2 0× 7.2?6,4.4?4, .6?3, 5.2?2,1.5×3, 1.21.3, 0.6×0.3, 0?3.65,.82?1 , ×0.4, 3.6?3, ?3, 0.45?9,?2, 1.2?,?5, 8.4?7, ?0.5, 10 / 13 精品文档 8.4?0.7, ?4, 2.7?3, .6?6, 0.45?4,0.34?17, 0.34?0.17,1.4?0.7, 0.120.9, 0.48?0.8,2.7, 0.3?0.01,2.50.17, 0.9?0.45,2.50.01 , 3?4,30.4×4, 3.6，6.3,3.6?0.06, .4?0.11, ?0.5 ,.6?16, .1?9, 0.05×4, 5.6?4.2×3 5.1?1 ?.53.5×0 , 1,0.08, .5×0.01, 0.25, 3.9，0.39,4.8，5.2,0.5×1.25? 0.75×100= 0.02×0.5= .6×0.3=.3?7= .6×100= 0.75?0.25= 0.125×8=.8?0.3= 0., 6.4?4,, 2.5×2=2.1×2= 2.8×10=5.6+0.4= 4.7+2.3=7.2×0.8= 11 / 13 精品文档 6×3.4= 1.5?0.3,0.5×10=0.7×0.8=4.5×2= 0.62,0.32=.2×0.6×8= 0.04×20=.9,2.5= 1.4×0.5= 0.86?2= 0.56?28=0.7×9= 3.6?24=6., .8= 12.8?4=1.64+4.1=10?20= 0.35× 0.6=.08×0.01= 0.4× 0.5= 0.36?0.4= 0.8×1.1=5.2?13=24?15=.95×1000=0.64?0.8=.2+12.8= 12.5?5= .65×10= .9×0.1= 2.4?0.8= 10.8?9= .6?0.8=5?0.25= 0.108?2= 7.8?0.01= .4?0.6= .2?5= 4.95?0.9=.65?0.1=0.325×100=7×0.62=.5×8= 0.56?0.8= .4,2.8= 0.18?0.2= 0.6?0.7= .9?0.13= 7.2×0.1= 1.6?0.8= 1?2.5= 0?1.7= 0.22×102=,0.05= 3.9?0.1324×0.5= 4.8×0.5= 0.125×4= 0.01×0.1=1.25×0.8=9.6?0.8=×0.24= 16.5?0.5= .8，4.2=.28×0.1= 0.25×0.4= .2?0.04=.5×0.12= 0.84?2.1= 0.16?8=.5×0.02=0.012× 12 / 13 精品文档 0.2=.3×0.3=.8? 0.6=?5= 0.96?0.2= 10.5×0.4=0.54? 0.6= 0.61，0.39=.08? 0.4= 8，7.2= 0?6= .5，5=.3，0.27=0.56?28= 1.2×30=.6?0.12= 0.3?0.6=×0.125= 10?20= 13 / 13