沪教版知识点归纳 —— 一年级数学-下册
知识点归纳——一年级数学-下册1. 加减法中的规律: (1)一个加数增加(或减少)几,和也跟着增加或(减少)几。(2)一个加数增加,另一个加数减少相同的数,和不变。(3)减数不变,被减数增加(减少)几,差也跟着增加(减少)几。(4)被减数不变,减数增加(减少)几,差也跟着减少(增加)几。(5)被减数和减数同时增加或减少相同的数,差不变。2. 比一比的方法.(1)看符号找出大小数. (2)确定算式结果. (3)根据加减法的关系计算出( )的数. 3. 加减法之间的关系:加数+ 加数=和和- 第一个加数=第二个加数和- 第二个加数=第一个加数被减数- 减数=差被减数- 差=减数差+ ...
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