四年级上册数学简便计算汇总
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简介
一、运用加法交换律、结合律简便计算【(a+b)+c=a+(b+c)】 355+275+125+245 =(355+245)+(275+125) =600+400 =1000 189+26+11 =189+11+26 =200+26 =226 256+79+121 =256+(79+121) =256+200 =456 二、减法简便计算 1.连减加括号【a-b-c=a-(b+c)】 645-156-244 =645-(156+244) =645-400 =245 689-143-257 =689-(143+257) =689-400 =289 273-64-36 =273-(64+36) =273-100 =173 2.去括号连减
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