小数乘法简便运算分类练习题(共6页).docx

精选优质文档-倾情为你奉上师诚培训学校小数乘法简便运算专项训练练习题一、乘法交换律涉及定律：乘法交换律a×b×ca×c×b0.25×8.5×4 12.5×0.96×0.8 0.25×0.73×4 0.25×16.2×4二、乘法结合律涉及定律：乘法结合律（a×b）×ca×（c×b）4.36×12.5×8 0.95×0.25×435×0.2×0.5 0.75×50×0.4三、乘法分配律沙及定律：乘法分配律（ab)×ca×cb×c基本方法：将括号中相加减的两项分别与括号外的分数相乘，符号保持不变。(1.250.125)×8 (204)×0.25(20.4)×5 (1252.5)×0.8涉及定律：乘法分配律逆向定律a×ba×Ca×(bc)基本方法：提取两个乘式中共有的因数，将剩余的因数用加减相减，同时添加括号，先行运算。3.72×3.56.28×3.5 15.6×2.115.6×1.1 27.5×3.77.5×3.73.9×2.73.9×7.3 3.83×4.563.83×5.44 7.09×10.80.8×7.0910.6×0.359.6×0.35 7.6×0.80.2×7.6五、乘法分配律拓展应用（将一个数凑整）4.8×10.1 3.6×102 0.39×1998.9×1.01 0.32×403 3.65×10.1六、拆分因数1.25×2.5×32 3.2×0.25×12.5 8.8×1.25 0.25×36 25×4.4七、巧用因数“1”4.2×994.2 56.5×9956.5 9.7×999.75.4×115.4 12.7×9.91.27 1.87×9.90.187八、积不变原理6.66×3.366.6×67 46×5723×86 4.8×7.878×0.52101×0.870.91×87 3.14×0.6831.4×0.0323.65×4.736.5×0.37 2.3×162.3×232.35×1.03×0.2 0.45×99 32×1.2512.5×10.8 53×10.1 0.125×9645×1.585.5×15.8 25×7.3×0.4 45×2150×2.1专心-专注-专业