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。
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。
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。
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 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。
Master the method of doing addition and subtraction.
掌握整十数加减法的计算方法。
Master the method of doing addition and subtraction.
掌握整十数加减法的计算方法。
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