小数乘法简便运算分类练习题.docx

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1、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×c＝a×c×b0.25×8.5×412.5×0.96×0.80.25×0.73×40.25×16.2×4二、乘法结合律涉及定律：乘法结合律（a×b）×c＝a×（c×b）4.36×12.5×80.95×0.25×435×0.2×0.50.75×50×0.4三、乘法分配律沙及定律：乘法分配律（ab)×c＝a×cb×c5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。(1.25－0.125)×8(20－4)×0.25(2＋0.4)×5(12

2、5＋2.5)×0.8涉及定律：乘法分配律逆向定律a×ba×C＝a×(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。3.72×3.5＋6.28×3.515.6×2.1－15.6×1.127.5×3.7－7.5×3.73.9×2.7＋3.9×7.33.83×4.56＋3.83×5.447.09×10.8－0.8×7.0910.6×0.35－9.6×0.357.6×0.8＋0.2×7.65五、乘法分配律拓展应用（将一个数凑整）4.8×10.13.6×1020.39×1998.9×1.010.32×4

3、033.65×10.1六、拆分因数1.25×2.5×323.2×0.25×12.58.8×1.250.25×3625×4.4七、巧用因数“1”4.2×99＋4.256.5×99＋56.59.7×99＋9.75.4×11－5.412.7×9.9＋1.271.87×9.9＋0.1875八、积不变原理6.66×3.3＋66.6×6746×57＋23×864.8×7.8＋78×0.52101×0.87－0.91×873.14×0.68＋31.4×0.0323.65×4.7－36.5×0.372.3×16＋2.3×23＋2.355×1.03×0.

4、20.45×9932×1.2512.5×10.853×10.10.125×9645×1.58＋5.5×15.825×7.3×0.445×21－50×2.15