五年级上册数学小数简便运算计算题专项训练
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简介
五年级上册数学 《小数简便运算》计算题专项训练 1.加法交换律简算 2.加法结合律简算 0.75+9.8+0.25 48.8+0.4+0.6 =0.75+0.25+9.8 =48.8+(0.4+0.6) =1+9.8 =10.8 =48.8+1 =49.8 3.乘法交换律简算 4.乘法结合律简算 2.5×5.6×0.4 99×12.5×0.8 =2.5×0.4×5.6 =99×(12.5×0.8) =1×5.6 =5.6 =99×10 =990 5.含加法交换律与结合律 6.含乘法交换律与结合律 6.5+0.28+3.5+0.72 2.5×1.25×0.4×0.8 =6.5+3.5+0.28+0.72 =2.5×0.4×1.25×0.8 =(6.5+3.5)+(0.28+0.72) =(2.5×0.4)×(1.25×0.8) =10+1 =11 =1×1 =1 五年级上册数学 《小数简便运算》计算题专项训练 7.乘法分配律 8.乘法分配律 7.6×0.8+0.2×7.6 1.28×8.6+0.72×8.6 =7.6×(0.8+0.2) =(1.28+0.72)×8.6 =7.6×1 =2×8.6 =7.6 =17.2 9.乘法分配律提取式 10.乘法分配律提取式 1.35×12-1.35×2 95.5÷1.6-15.5÷1.6 =1.35×(12-2) =(95.5-15.5)÷1.6 =1.35×10 =80÷1.6 =13.5 =50 11.因数换减法 12.因数换加法 99×2.6 4.5×102 =(100-1)×2.6 =4.5×(100+2) =100×2.6-1×2.6 =4.5×100+4.5×2 =260-2.6 =257.4 =450+9 =459
