小数简便计算练习题400道

小数简便计算练习题400道小数的简便计算是小学数学学习中的重要一环，它不仅能够提高计算的速度和准确性，更能培养学生的观察力、思维灵活性和对数学规律的运用能力。掌握小数简便计算，关键在于熟练运用整数的运算定律和性质，并将其迁移到小数运算中。我们精心选编了400道小数简便计算练习题，旨在帮助同学们更好地掌握这一技能。这些题目涵盖了小数加法、减法、乘法、除法的各种简便计算方法，从基础巩固到综合运用，力求全面且有梯度。希望同学们能认真对待每一道题，在练习中感悟方法，在实践中提升能力。一、加法运算定律的简便计算（一）加法交换律与结合律的应用1.2.5+3.6=3.6+()2.1.8+0.7+9.3=1.8+(0.7+)3.5.4+2.8+4.6=(5.4+)+2.84.0.37+1.63+2.5=(+)+2.55.3.28+1.72+0.59=(+)+0.596.4.03+2.7+0.97=(4.03+)+2.77.1.25+0.85+0.75=(1.25+)+0.858.0.6+7.3+0.4+2.7=(0.6+)+(7.3+)9.2.15+3.8+0.85+6.2=(2.15+)+(3.8+)10.5.6+0.39+4.4+0.61=(5.6+)+(0.39+)11.3.72+1.5+2.28+8.5=(+)+(+)12.0.8+4.1+0.2+5.9=(+)+(+)13.1.02+3.98+2.5=(+)+2.514.6.3+0.86+3.7+0.14=(+)+(+)15.2.83+1.75+3.17+2.25=(+)+(+)16.0.19+2.36+8.81+7.64=(+)+(+)17.4.5+0.27+5.5+0.73=(+)+(+)18.1.38+0.7+0.62+9.3=(+)+(+)19.3.07+5.2+6.93+4.8=(+)+(+)20.0.54+2.6+4.46+7.4=(+)+(+)二、减法运算性质的简便计算（一）一个数连续减去两个数，等于这个数减去这两个数的和21.5.6-1.8-1.2=5.6-(+)22.7.8-2.3-2.7=7.8-(+)23.10-3.6-6.4=10-(+)24.4.25-1.7-1.3=4.25-(+)25.6.1-0.89-0.11=6.1-(+)26.8.47-2.5-3.5=8.47-(+)27.3.68-1.24-1.76=3.68-(+)28.9.5-3.27-0.73=9.5-(+)29.12.3-4.5-5.5=12.3-(+)30.5.03-1.2-2.8=5.03-(+)（二）一个数减去两个数的和，等于这个数连续减去这两个数31.10-(3.5+4.5)=10--32.7.6-(2.6+3.4)=7.6--33.5.48-(1.48+2.5)=5.48--34.9.3-(2.3+3.7)=9.3--35.6.75-(0.75+3.25)=6.75--36.4.8-(1.8+0.9)=4.8--37.11.2-(3.2+4.6)=11.2--38.8.15-(2.15+0.5)=8.15--39.3.9-(1.9+0.4)=3.9--40.15.6-(5.6+7.2)=15.6--（三）一个数减去另一个数，再加上第三个数，等于这个数加上第三个数，再减去另一个数(或调整减数的顺序)41.7.8-3.5+2.2=7.8+-42.10.5-4.6+9.5=10.5+-43.5.3+2.7-3.3=5.3-+44.8.6-2.7+1.4=8.6+-45.6.4+3.6-2.4=6.4-+46.9.2-5.8+0.8=9.2+-47.3.1+5.9-2.1=3.1-+48.12.7-8.9+7.3=12.7+-49.4.8+0.2-3.8=4.8-+50.7.5-2.1+2.5=7.5+-三、乘法运算定律的简便计算（一）乘法交换律与结合律的应用51.2.5×3.6=3.6×()52.0.8×1.25=1.25×()53.(2.5×0.4)×0.7=2.5×(×)54.(0.8×1.5)×0.2=0.8×(×)55.2.5×(0.4×3)=(×)×356.1.25×(8×0.3)=(×)×0.357.0.25×4.7×4=(×)×4.758.1.25×3.2×0.8=(×)×3.259.2.5×0.8×0.4=(×)×0.860.0.5×7.6×2=(×)×7.661.2.5×1.7×0.4×0.3=(×)×(×)62.1.25×0.9×0.8×0.1=(×)×(×)63.0.25×0.5×4×2=(×)×(×)64.2.5×0.4×1.1=(×)×1.165.1.25×80×0.3=(×)×0.366.0.25×36=0.25×(×)=(×)×67.1.25×24=1.25×(×)=(×)×68.2.5×16=2.5×(×)=(×)×69.0.25×4.4=0.25×(×)=(×)×70.1.25×0.32=1.25×(×)=(×)×（二）乘法分配律的应用(a×(b+c)=a×b+a×c)71.(10+0.1)×3.5=×3.5+×3.572.(20+2)×0.4=×0.4+×0.473.(0.8+0.08)×12.5=×12.5+×12.574.0.5×(20+0.2)=0.5×+0.5×75.1.2×(5+0.5)=1.2×+1.2×76.3.6×(100+2)=3.6×+3.6×77.(1.5+0.3)×0.2=×0.2+×0.278.0.25×(40+4)=0.25×+0.25×79.(0.1+0.01)×6.7=×6.7+×6.780.10.1×5.6=(+)×5.6=×5.6+×5.681.9.9×2.3=(-)×2.3=×2.3-×2.382.1.02×3.4=(+)×3.4=×3.4+×3.483.0.98×1.5=(-)×1.5=×1.5-×1.584.2.01×4.6=(+)×4.6=×4.6+×4.685.5.9×101=5.9×(+)=5.9×+5.9×86.3.7×99=3.7×(-)=3.7×-3.7×87.0.88×10.1=0.88×(+)=0.88×+0.88×88.4.5×0.99=4.5×(-)=4.5×-4.5×89.6.2×1.02=6.2×(+)=6.2×+6.2×90.0.75×98=0.75×(-)=0.75×-0.75×（三）乘法分配律的逆应用(a×b+a×c=a×(b+c))91.3.5×2.7+3.5×7.3=3.5×(+)92.0.6×1.5+0.6×8.5=0.6×(+)93.12.5×0.8+12.5×0.2=12.5×(+)94.2.5×4.1+2.5×5.9=2.5×(+)95.0.4×3.6+0.4×6.4=0.4×(+)96.7.8×0.3+7.8×0.7=7.8×(+)97.5.6×1.1-5.6×0.1=5.6×(-)98.1.2×6.5-1.2×5.5=1.2×(-)99.0.9×4.2+0.9×5.8=0.9×(+)100.3.25×1.8-3.25×0.8=3.25×(-)101.4.7×0.23+4.7×0.77=4.7×(+)102.0.15×8.3+0.15×1.7=0.15×(+)103.6.3×2.1-6.3×1.1=6.3×(-)104.2.8×5.4+2.8×4.6=2.8×(+)105.0.58×3.6+0.58×6.4=0.58×(+)106.9.1×3.7+9.1×6.3=9.1×(+)107.1.05×2.4-0.05×2.4=(-)×2.4108.3.6×5.2+6.4×5.2=(+)×5.2109.0.82×1.7-0.82×0.7=0.82×(-)110.5.4×0.6+4.6×0.6=(+)×0.6111.7.2×1.01-7.2×0.01=7.2×(-)112.0.39×2.8+0.61×2.8=(+)×2.8113.4.5×9.9+4.5×0.1=4.5×(+)114.0.28×3.6+0.28×6.4=0.28×(+)115.8.1×0.5-7.1×0.5=(-)×0.5116.3.3×4.2+3.3×5.8