五上数学【小数乘法】简便计算专练
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简介
一、乘法交换律 (1)2.5×9×4 =2.5×4×9 =10×9 =90 (2)1.5×7×6 =1.5×6×7 =9×7 =63 (3)0.8×1.4×12.5 =0.8×12.5×1.4 =10×1.4 =14 (4)0.5×0.34×6 =0.5×6×0.34 =3×0.34 =1.2 (5)0.25×0.46×40 =0.25×40×0.46 =10×0.46 =4.6 (6)0.8×0.46×0.5 =0.8×0.5×0.46 =0.4×0.46 =0.184 二、乘法结合律 (1)4.31×1.25×0.8 =4.31×1 =4.31 (2)0.79×5×2 =0.79×10 =7.9 (3)0.16×2.5×400 =0.16×1000 =160 (4)12.56×0.4×5 =12.56×2 =25.12 (5)4.7×8×0.5 =4.7×4 =18.8 (6)3.36×0.05×6 =3.36×0.3 =1.008 三、乘法交换律与结合律
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