西师版五年级上册数学知识点
五年级数学上册复习知识点第一单元小数乘法1、计算小数乘法的方法:先按照整数乘法的计算方法算出积,再看因数中一共有几位小数,就从积的右边起数出几位,点上小数点。当积的位数不够时,用0补位,再点小数点。当得数的小数部分末尾有0,一般要把0去掉,进行化简。整数乘法的计算方法:1)从右边起,依次用第二个因数每位上的数去乘第一个因数,乘到哪一位,得数的末尾就和第二个因数的哪一位对齐;2)然后把几次乘得的数加起来。(整数末尾有0的乘法:可以先把0前面的数相乘,然后看各因数的末尾一共有几个0,就在乘得的数的末尾添写几个0。)2、两个不为0的数相乘,当一个因数比1小,它们的积比另一个因数小;当一个因数比1大,...
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