五年级上册数学《小数乘除法》简便计算专项练习

五年级上册数学《小数乘除法》简便计算专项练习

  • 简介

    ①84×10.1 =84×(10+0.1) =84×10+84×0.1 =84+0.84 =84.848 ②9.9×7.6 =(10-0.1)×7.6 =10×7.6-0.1×7.6 =76-0.76 =75.24 ③0.8×12.5 =(80+0.8)×12.5 =80×12.5+0.8×12.5 =1000+10 =1010 ④5.1×28+0.51×720 =5.1×28+5.1×72 =5.1×(28+72) =5.1×100 =510 ⑤0.48×101-0.48 =0.48×(101-1) =0.48×100 =48 ⑥2.5×399+2.5 =2.5×(399+1) =2.5×400 =1000 ⑦3.2×4.5+45×0.68 =3.2×4.5+4.5×6.8 =(3.2+6.8)×4.5 =10×4.5 =45 ⑧4.7×36+0.47×640 =4.7×36+4.7×64 =4.7×(36+64) =4.7×100 =470

五年级上册数学《小数乘除法》简便计算专项练习