加减乘除法各部分间的关系：

一、加法。

加数+加数＝和

一个加数＝和-另一个加数

二、减法。

被减数-减数＝差

减数＝被减数-差

被减数＝减数+差

三、乘法。

因数*因数＝积

一个因数＝积/另一个因数

四、除法。

被除数/除数＝商

除数＝被除数/商

被除数＝商*除数

（有余数的除法：被除数＝商*除数+余数）

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