五年级上册数学简便运算归类(最新整理)

1、五年级上册数学简便运算归类执教：林老师明确三点：1、一般情况下，四则运算的计算顺序是：有括号时，先算括号里面的；只有同一级运算时，从左往右；含有两级运算，先算乘除后算加减。2、由于有的计算题具有它自身的特征，这时运用运算定律，可以使计算过程简单，同时又不容易出错。加法交换律：a+b=b+a乘法交换律：ab=ba加法结合律：（a+b）+c=a+（b+c）乘法结合律：（ab）c=a(bc) 乘法分配律：(a+b)c=ac+bc3、注意对于同一个计算题，用简便方法计算，与不用简便方法计算得到的结果相同。我们可以用两种计算方法得到的结果对比，检验我们的计算是否正确。一、变换位置当一个计算题只有同一级运

2、算（只有乘除或只有加减运算）又没有括号时， 我们可以“带符号搬家” 。“符号搬家” :根据：加法交换律和乘法交换率a+b+c=a+c+ba-b-c=a-c-babc=acbabc=acb a-b+c=a+c-ba+b-c=a-c+babc=acbabc=acb练习：12.065.072.9425741252830.3410.29.661027.35.13441.77373二、加括号根据：加法结合律a+b+c=a+(b+c)a+b-c=a +(b-c),a-b+c=a(b-c)a-b-c= a-( b +c)根据：乘法结合律abc=a(bc)abc=a(bc)abc=a(bc)三、去括号（注：去

3、掉括号是添加括号的逆运算）a+(b+c)= a+b+ca +(b-c)= a+b-cabc=a(bc)a- (b-c)= a-b+ca-( b +c)= a-b-c a(bc) = abc0.25（41.2）1.25（2130.8）a(bc) = abc1.25（80.5）a(bc) = abc46(4.62) a(bc) = abc4(60.25)四、乘法分配律的两种典型类型1、括号里是加或减运算，与另一个数相乘，注意分配（408）2524（210）125（8+80）86（10002）36（100+50）15（408）2、注意相同因数的提取。0.921.410.928.591.311.61.

4、61.3五、一些简算小技巧1、巧借，可要注意还哦有借有还，再借不难嘛。9999+999+99+94821-9982、分拆，可不要改变数的大小哦3.212.5251.25883.60.253、注意构造，让算式满足乘法分配律的条件。2.69.9983.27+6.541012.172.173.89.90.38“”“”at the end, xiao bian gives you a passage. minand once said, people who learn to learn are very happy people. in every wonderful life, learning

5、is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio professional