She's ready to learn simple addition and subtraction.
她准备学习简单的加法和减法。
Master the method of doing addition and subtraction.
掌握整十数加减法的计算方法。
Understand that addition and subtraction are inverse.
理解加法和减法是互为逆运算；
The test involves simple calculations, such as addition and subtraction.
测试涉及简单的计算，如加法和减法。
The danger: students who can not even do simple addition and subtraction.
很危险的是，一些先生甚至连复杂的加减法都不会做。
Pressing return a couple more times will show an addition and subtraction.
再按两次回车将显示加法和减法表达式。
The little boy can already do simple problems in addition and subtraction.
这个小不点孩子都已经会做简单的加减法问题了。
We elves never need that. And addition and subtraction and division and fractions?
什么加法，减法，除法，分数，我们从来不用它们。
Not the same as addition and subtraction, reflecting the tendency is not the same.
不一样加法和减法，反映的趋势是不一样的。
Most of these are probably self-explanatory, like addition, subtraction, multiplication and division.
其中大多数可能都是不言自明的，比如加法、减法、乘法和除法。
Addition, subtraction, multiplication and division are all basic operations.
加 减乘除是最基本的运算法则。
The same was true for an addition-subtraction task that measures speed and accuracy.
在测量速度和准确度的加减运算任务中，情况也是如此。
The same was true for an addition-subtraction task that measures speed and accuracy.
在测量速度和准确度的加减运算任务中，情况也是如此。
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