五年级上册数学第一单元复习题.docx

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1、五年级上册数学第一单元复习题教师：保永祥一、识记1、小数乘小数的意义与整数乘法的意义完全相同；就是求几个相同加数的和的简便计算.2、小数乘整数时；先把小数扩大成整数；按整数乘法的法则算出积；再看因数中有几位小数；就从积的右边起数出几位；点上小数点.3、小数乘小数；先按整数乘法算出积；再看因数中一共有几位小数；就从积右边起数出几位；点上小数点.乘得的积的小数位数不够；要在前面用0补足；再点上小数点.4、一个数（0除外）乘以大于1的数；积比原来的数大、一个数（0除外）乘以小于1的数；积比原来的数小.5、求积的近似数的一般方法：需要保留一位小数；就看

2、第二位小数是几；需要保留二位小数；就看第三位小数是几；需要保留三位小数；就看第四位小数是几；然后采用“四舍五入”法对那位上的数进行取舍.求积的近似数时；小数末尾的0不能去掉；因为他表示精确度.6、整数乘法的交换律、结合律和分配律；对小数乘法也同样适用.二、练习题1/23（一）计算题2.65×8=4.72×6=0.46×7=0.046×7=46×0.07=4.6×7=46×0.7=46×70=15.24×5=6.8×3=0.45×18=0.12×72=2.76×24=18×0.63=6.85×15=0.72×5=0.46×2.8=0.75×2.3

3、=8.3×4.7=2.5×0.34=2/232.5×0.34=2.7×1.3=27×0.13=0.27×13=27×0.013=7.3×2.6=0.43×0.72=5.4×0.25=1.25×0.8=3.2×5.8=2.76×4.5=37.96×1.5=10.8×5.2=3.7×4.3=5.2×0.04=3×0.8=2.97×0=0.6×0.9=0.1×0.5=2.3×0.8=7.32×0.6=7.5×4.3=4.48×0.17=0.36×1.09=3/236.28×0.17=8.96×31=3.7×0.2=5.3×0.1=0.4×0.6=0.

4、9×0.7=2.8×0.5=0.4×0.6=0.9×0.9=2.4×0.3=0.125×8=0.25×0.4=3.9×0.2=2.7×6=0.3×7.5=3.2×1.9=0.32×19=32×0.19=0.32×190=2.75×0.99=3.04×1.01=0.85×0.64=0.76×2.3=1.1×2.2=6.4×1=2.56×3.7=2.7×0.032=3.5×0.2=4/2315.6+2.1=0.05×7=3×0.09=17.6-0.8=0.15×0.4=1.1×0.3=1.8×0.04=4.3×0.15=0.032×1.4=6×2.

5、45=0.5×0.11=3×7.5=2.56-1.89=3.5+2.7=2.4×0.3=3.75+2=4.8×3.539=0.73×5.336=3.75×5=0.36×0.04=0.95×0.8=4.8×6=100×0.25=6.4×0.2=5/230.2×0.7=37×0.1=15×0.7=6-2.37=5.83×1.9=12-6.9=100.56×4.03=0.78×2=1.3×0.11=5.34×0.5=5.8×9=1.9×0.7=10×0.45=0.8×2.3=2.5×0.4=8.3×7.5=0.43×0.19=4.6×0.3=12.4

6、×7=2.3×12=2.05×6=3.13×53=0.72×5=0.86×7=6/233.3×16=12.8×42=0.19×40=2.4×0.8=1.92×0.9=6.7×0.3=2.4×6.2=5.4×1.07=0.45×0.6=0.56×0.04=3.7×4.6=0.48×1.5=0.29×0.07=0.056×0.15=1.2×0.4=1.2×0.11=0.35×1.2=1.2×0.9=3.2×2.5=2.6×1.08=1.8×23=0.37×0.4=1.06×25=0.082×0.14=7/237×0.86=0.6×0.39=27×0

7、.43=0.055×0.06=56.7×38=2.8×5.6=0.37×0.94=1.23×29.2=1.56×0.9=0.78×6.2=0.39×2.9=0.58×0.08=3.7×200=0.18×8.45=4.5×0.002=0.072×0.16=756×0.9=1×0.94=4.25×1.1=31.4×1.2=0.8×0.9=1.7×0.45=1.2×1.4=0.37×8.4=8/233.14×3.9=0.86×1.2=2.34×0.15=1.05×0.26=4.8×0.25=0.78×98=1.5×111=21×2.84=3800×0

8、.16=38×1.6=38×1600=3.8×1600=21.5×7=9.48×23=48×0.93=8.37×1.2=4.53×1=5.980=78