四年级下册数学【简便计算】专项训练
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简介
四年级下册数学【简便计算】专项训练 考点一：加法交换结合律 48+25+175 =48+(25+175) =48+200 =248 153+38+162 =153+(38+162) =153+200 =353 578+143+22+57 =578+22+143+57 =600+200 =800 822+197+78 (822+78)+197 =900+197 =1097 167+289+33 =(167+33)+289 =200+289 =489 58+395+105 =158+(395+105) =158+500 =658 考点二：乘法交换结合律(一) 35×2×5 =35×(2×5) =35×10 =350 (125×5)×8 =125×8×5 =1000×5 =5000 60×25×4 =60×(25×4) =60×100 =6000 125×5×8×2 =125×8×(5×2) =1000×10 =10000 25×17×4 =25×4×17 =100×17 =1700 42×125×8 =42×(125×8) =42×1000 =42000
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