小学四年级下册数学小数乘法练习4(6页).doc

-小学四年级下册数学小数乘法练习4-第 6 页小学四年级下册数学小数乘法练习题一、 直接写得数3.8×2= 10×0.7= 13.9×0= 508÷100= 5.5×1= 1.8×0.5= 3.2×3= 13.1×0.3=0.08×1.25= 2.5×4= 2.5×8= 0.5×0.2=0.6×0.1= 0.7×0.8= 2.5×8×0= 125×0.8=二、 竖式计算2.8×0.7= 13×0.15= 0.39×0.6= 0.38×600=7.05×2.4= 0.46×7.9= 89.3×7.6= 60.5×400=三、 混合运算12.5×8.2×8 0.23×1.40.23×8.6 0.125×（800.8）0.4×0.16×2.5 5.6×101 7.85×991.15×991.15 16.2×10116.2 4.5×7.85.5×7.8四、一斤香蕉3.8元，一斤苹果4.2元。强强的妈妈各买回5斤，需要准备多少钱？ 小学四年级下册数学小数乘法计算练习一、直接写得数3.8×2= 10×0.7= 13.9×0= 508÷100= 5.5×1= 1.8×0.5= 3.2×3= 13.1×0.3=0.08×1.25= 2.5×4= 2.5×8= 0.5×0.2=0.6×0.1= 0.7×0.8= 2.5×8×0= 125×0.8= 二、填空1、8个0.8是(     )，30个0.25的和是(      )。 2、每千克梨4.8元，小明买了0.25千克，需要(         )元。 3、比较大小 1.8 × 0.99     1.8    1.8× 0.99    0.99     8.5× 1.2    0.85× 12 4、0.7×5表示(                                            )。 5、8×b，当b(     )时，积等于8;当b(      )时，积小于8;当b(      )时，积大于8。 7、根据算式45.5×3.6=163.8写出两个积为16.38的乘法算式            ，                      。      45.5×360             0.455×360  8、一个长方形的长是0.8米、宽是0.24米，它的周长是(    ）米   面积是(      ）   。 三、小法官 1、0.125×6.3×8可以用分配律简便计算。(        ) 2、4.32×0.4的积的小数位数一定是两位。 (     ) 3、4.25×1.8-1.8=4.25×0 (      ) 5、两个数相乘，积一定比任何一个乘数大。 (     ) 6、小数点后面添上0或去掉0，小数大小不变。 (     ) 7、小数乘法列竖式时，一定要对齐数位。 (      ) 四、对号入座。(选择正确答案的序号填在括号里) 1、12.5×9×8=9×(12.5×8)是根据 A、乘法交换律   B、乘法结合律   C、乘法交换律和结合律 2、7.6×10.1= （   ）    A、7.6×10+0.1   B、7.6×10+7.6×0.1  C、7.6×10+7.6×1 3、不用计算，下面（      ） 的积最大。 A、0.7×80   B、0.7×0.8  C、0.7×0.08 4、5.36×2.5的积有（      ） 位小数。        A、3       B、2       C、1五、竖式计算2.8×0.7= 13×0.15= 0.39×0.6= 0.38×600=7.05×2.4= 0.46×7.9= 89.3×7.6= 60.5×400=3.05×18=                0.37×2.31=                         4.6×18.9= 40.5×4.2=混合运算12.5×8.2×8 0.23×1.40.23×8.6 0.125×（800.8）0.4×0.16×2.5 5.6×101 7.85×991.15×991.15 16.2×10116.2 4.5×7.85.5×7.83、脱式计算，能简便的要简便计算。 2.8+7.2×0.81            0.34×2.5×0.4             1.25×11×4×0.8      8.93×5.78.93×3.38.93       4.82×102                0.7×0.46+0.7×0.54        六、解决问题 1、汽车每小时行45千米，火车的速度是汽车速度的2.8倍，飞机的速度是火车速度 的7.5倍，飞机每小时飞行多少千米?   2、修一条水渠，原计划每天修0.24千米，实际每天比原计划多修0.06千米，12天 后还差0.4千米没有修，这条水渠长多少千米?   3、苹果每千克3.8元，梨每千克2.9元，妈妈买了3千克苹果和5千克梨，一共花了 多少钱?   4、每人每天节约0.21千克水，50个人4月份能节约多少千克水？  5、叔叔按每千克3,8元的价格批发了200千克苹果，按每千克5元卖了120千克之 后，剩下的每千克4.5元，卖完后，叔叔能赚多少钱？6、一斤香蕉3.8元，一斤苹果4.2元。强强的妈妈各买回5斤，需要准备多少钱？ 博雅学堂四年级数学小数乘法练习题题3.8×0.12= 0.57×0.6= 6.4×0.5= 6.7×5.8= 9.8×3.8= 7.8×6.4= 4.6×2.7= 4.5×2.7=5×1.6= 3×0.6= 3×1.2= 6.7×7.6= 5.4×7.8= 2.6×3.6= 3.5×1.7= 8.3×2.6= 1.4×0.7= 4.5×2.8= 7.4×2.6= 6.2×1.4=5.4×2.6= 2.3×1.4= 3.7×1.8= 4.5×2.3=5.2×1.6= 3.6×0.8= 0.66×1.4= 6.5×5.8= 0.72×0.49= 0.42×0.28= 0.24×0.19= 2.4×1.3= 0.72×0.27= 0.78×0.32= 0.65×0.04= 0.23×0.16= 0.29×0.15= 0.16×0.19= 4×1.2= 7×4.6= 6×0.37= 0.28×0.27= 0.75×0.42= 2.3×1.9=8×0.64= 2.7×0.8= 10×4.2= 7.1×3.9= 4.3×1.4= 2.6×1.6= 0.8×0.3= 0.65×0.4= 0.91×0.6= 1.8×1.6= 4.8×0.5= 3.2×0.4=9.8×4.8= 12×8.3= 15.2×6.5= 20.1×11.1= 13.34×10.32= 6.52×0.48= 6.3×5.1= 8.7×3.6= 14.3×4.3= 1.5×0.54= 10×4.2= 2.47×3.24=2.98×0.56= 5.64×1.78= 8.02×0.98= 7.1×3.9= 2.8×11.39= 12.53×4.67= 7.2×6.45= 1.65×3.35= 7.96×1.45= 60×1.27= 6.07×4.89= 5×0.41=0.9×0.5= 2×0.7= 1.2×4.3= 5.4×2.7= 6×2.9= 3.7×1.7= 4.2×0.8= 7.5×2.5= 2.2×4.3= 9.5×7.1= 3.5×1.6=5.2×2.8= 7.8×1.6= 9.6×4.1= 10×4.2= 5.1×2.5= 4.1×3.4= 1.2×3.8= 9.6×4.1= 7.8×1.6= 3.5×1.6= 4.4×1.4= 2.9×2.1=3.5×1.2= 4.8×3.4= 6.9×2.5= 2.5×7.8= 8×5.4= 6.9×2.5= 2×3.5= 6.8×2.2= 4.7×5.4= 4.1×8.8= 2.2×5.5= 9.6×2.1=1.7×3.8= 7.4×3.6= 0.8×0.23= 1.6×2.4= 4.7×3.5= 1.2×3.6= 1.5×3.8= 2.8×1.2= 7.3×2.7= 7.3×2.7= 6.2×3.7= 4.2×3.9=0.54×0.65= 7.5×5.2= 0.7×0.5= 0.32×0.47= 8.3×6.3= 7.2×0.42= 0.48×0.52= 0.8×0.25= 43.5×0.65= 0.32×0.16= 0.35×0.55= 0.87×0.8=0.24×0.08= 0.92×0.37= 1.4×0.6= 3.6×4.2= 0.72×0.48= 6.8×3.2= 7.1×3.4= 0.42×0.66= 0.32×0.68= 2.8×7.2= 0.65×0.19= 3.09×1.2=3.25×5.64= 0.25×0.47= 0.82×0.18= 7.8×2.4= 0.45×0.18= 0.4×0.16= 8.2×1.8= 0.73×0.27= 8×3.2= 9.8×4.8= 3×2.4= 2.8×0.9=1.29×0.18= 5.1×0.8= 10×0.3= 8.9×4.9= 6.8×0.7= 8×0.72= 6.6×3.4= 6.4×1.3= 1.2×0.8= 7.3×6.2= 8.7×3.6= 12.3×0.7= 0.8×9.2= 4.7×1.9= 5.1×3.9= 1.4×0.6= 3.8×6.4= 0.6×7.45= 4.9×0.1= 4.5×3.2= 1.8×0.9= 6.5×0.5= 10.5×6.5=7.5×0.5= 0.78×0.28= 12.8×2.8= 9.6×2.3= 3.8×0.12= 0.8×0.08= 10×7.4= 7.5×3.2= 0.42×0.58= 0.8×0.15= 2.5×0.4= 8.2×2.6=1.4×0.7= 2.5×4.6= 0.5×9.8= 6.7×2.6= 7.2×5.9= 8.7×3.6= 5.69×2.48= 2.9×4.1= 9.1×6.7= 2.03×1.2= 8.6×4.9= 1.3×2.03=9.46×7.21= 1.56×2.24= 3.5×1.25= 0.75×0.4= 20×0.78= 4.8×4.2= 5.7×3= 4.9×1.7= 1.34×0.8= 2×0.75= 8.7×0.03= 0.2×0.09= 8.5×2.5= 3.4×1.4= 0.68×0.42= 7.82×7.2= 2×9.1= 0.48×0.52= 8.1×5.1= 0.78×0.24= 0.8×0.18= 0.89×0.25= 1×0.98= 0.9×0.1= 1×0.8= 4.5×4= 5.6×4= 5.7×3.3= 10×4.4= 6×6.6= 9.5×2.7= 1×0.55= 四年级小数加减混合运算题25.6-(0.23+5.6)-1.77 13.75-(4.75+6.48) 7.83+2.34-0.83+6.663.82+2.9+0.18+9.1 25.48-(9.4-0.52) 35.6-1.8-15.6-7.25.93+0.19+2.81 7.3+2.7-7.3+2.7 48.4+2.78+51.6-0.7823.4+0.8-13.4-7.2 4.8+8.63+5.2+0.37 3.07-0.38-1.621.27+3.9+0.73+15.1 5.84-1.8-3.2 132.44-(58.74+19.44)7.5+4.8-6.5 3.25+2.76+1.75 13.75-(3.75+6.48)7.14-0.53-2.47 13.45-4.68+2.55 47.8-7.45+8.236.8-4.5+6.98 49.8-9.6+8.8 15.2-6.8-3.45 1.76+0.65+3.24 0.134+2.66+0.8 7.5+4.9-6.33.45+1.79+0.65 4.85+8.63+0.37 1.76+3.44+0.3536.54-1.76-8.66 8-2.45-1.02 23.4+3.4-0.236.02+3.6+1.98 3.07-0.38-1.62 7.5+4.9-6.536.8-3.9-6.88 3.285+1.79+0.59 23.4-0.8+13.4 32+4.9-8.6 1.29+3.7+2.71 5.93+0.49+2.06 9-2.45-1.65 21+0.56+11.3 64.89-7.88-13.6