新版三下概念整理稿
http://t.cn/Ri466E4三年级下册数学概念汇总和方法第一单元乘法1.口算乘法:①两位数乘整十数的口算方法:先用整十数0前面的数与两位数相乘,计算出结果后,再在积的末尾添上1个0。(如:30×32=960;想:3×32=96,在96的末尾添上1个0,是960.)②整十数乘整十数的口算方法:两个乘数相乘,可以先把0前面的数相乘,然后看两个因数的末尾一共有几个0,就在乘得的数后面添几个0。[把十位上的数相乘,计算出结果后,再在积的末尾添上2个0。]③两位数乘两位数的笔算方法:㈠笔算两位数乘两位数,书写竖式时要末尾对齐。先用第二个乘数个位上的数去乘第一个乘数每一位上的数,积的末尾从个位写...
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