五年级上册数学小数乘法简便计算题专练

五年级上册数学‖小数乘法简便计算小数乘法简便计算（1）1.25×4.37×0.8＝1.25×0.8×4.37＝1×4.37＝4.376.4×1.33+3.6×1.33＝1.33×(6.4+3.6)＝1.33×10＝13.37.83×10.3-7.83×0.3＝7.83×(10.3-0.3)＝7.83×10＝78.310.5×8.5+10.5×1.5＝10.5×(8.5+1.5)＝10.5×10＝1056.74×99+6.74＝6.74×(99+1)＝6.74×100＝6740.038×4×0.25＝0.038×(4×0.25)＝0.038×1＝0.0385.8×10.1＝5.8×(10+0.1)＝5.8×10+5.8×0.1＝58+0.58＝58.58102×0.36＝(100+2)×0.36＝100×0.36+2×0.36＝36+0.72＝36.7212.5×0.15×8＝12.5×8×0.15＝100×0.15＝150.25×(4+0.4)＝0.25×4+0.25×0.4＝1+0.1＝1.1五年级上册数学‖小数乘法简便计算小数乘法简便计算（2）1.25×(7.6×8)＝1.25×8×7.6＝10×76＝760.25×2.61×8＝0.25×8×2.61＝2×2.61＝5.223.15×101-3.15＝3.15×(101-1)＝3.15×100＝3153.45×0.25×4＝3.45×(0.25×4)＝3.45×1＝3.450.45×202＝0.45×(200+2)＝0.45×200+0.45×2＝90+0.9＝90.91.8×25+12×2.5＝18×25+1.2×25＝(1.8+1.2)×25＝3×25＝753.6×101＝3.6×(100+1)＝360+36＝363.61.25×2.5×0.8×0.4＝(1.25×0.8)×(2.5×0.4)＝1×1＝16.4×101.3-6.4×13＝6.4×(101.3-1.3)＝6.4×100＝64010.5×8.3+10.5×1.7＝10.5×(8.3+17)＝10.5×10＝105五年级上册数学‖小数乘法简便计算小数乘法简便计算（3）2.5×(3.8×0.04)＝2.5×0.04×3.8＝0.1×3.8＝0.380.7×0.46+0.7×0.34＝0.7×(0.46+0.54)＝0.7×1＝0.7(8×5.27)×1.25＝8×1.25×5.27＝10×5.27＝52.746×0.33+54×0.33＝(46+54)×0.33＝100×0.33＝330.25×39+0.25＝0.25×(39+1)＝0.25×40＝100.125×72＝0125×8×9＝1×9＝90.99×9+0.99＝0.99×(9+1)＝0.99×10＝9.90.34×2.5×0.4＝0.34×(2.5×0.4)＝0.34×1＝0.340.69×99＝0.69×(100-1)＝0.69×100-0.69＝69-0.69＝68.317.69×101＝7.69×(100+1)＝7.69×100+7.69＝769+7.69＝776.69五年级上册数学‖小数乘法简便计算小数乘法简便计算（4）16.12×99+16.12＝16.12×(99+1)＝16.12×100＝16126.8×5.7+4.3×6.8＝6.8×(5.7+4.3)＝6.8×10＝6826.3×46+2.63×640＝26.3×46+26.3×64＝26.3×(46+64)＝26.3×110＝28930.64×102＝0.64×(100+2)＝0.64×100+0.64×2＝64+1.28＝65.282.37×99+2.37＝2.37×(99+1)＝2.37×100＝23713.4×6.3-3.4×63＝(13.4-3.4)×6.3＝10×6.3＝631.25×(8-0.8)＝1.25×8-1.25×0.8＝10-1＝912.5×8.8＝12.5×8×1.1＝100×1.1＝1106.8×0.25＝1.7×(4×0.25)＝1.7×1＝1.70.9×32.7-2.7×0.9＝0.9×(32.7-2.7)＝0.9×30＝27五年级上册数学‖小数乘法简便计算小数乘法简便计算（5）0.32×2.5×1.25＝(0.8×0.4)×2.5×1.25＝(0.8×1.25)×(0.4×25)＝1×1＝198×0.54＝(100-2)×0.54＝100×0.54-2×0.54＝54-1.08＝52.924.8×5.5×1.25＝0.8×6×5.5×1.25＝(0.8×1.25)×(6×5.5)＝1×33＝330.85×102＝0.85×(100+2)＝0.85×100+0.85×2＝85+1.7＝86.75.67×99＝5.67×(100-1)＝5.67×100-5.67＝567-5.67＝561.331.5×8.9+0.11×15＝1.5×8.9+1.1×1.5＝1.5×(8.9+1.1)＝1.5×10＝1516.3×6.8+0