The pupil could add and subtract but hadn't learned to divide.

这名小学生能做加法和减法，但还没学会做除法。

youdao

You've got to juggle the two equations, multiply that by 4, multiply that by 3, add and subtract and so on.

你必须联立这两个方程，一个乘以4，另一个乘以3，再加减等等。

youdao

You also learn how to add and subtract in your head.

你也应该学会加减法的心算。

youdao

You've got to juggle the two equations, multiply that by 4, multiply that by 3, add and subtract and so on.

同时处理这两个方程,这个两边乘以4,另一个两边乘以3,将两方程相加或相减求出答案

耶鲁公开课 - 基础物理课程节选

But all of you in this room probably remember what we technically call the base 10 system or decimal system because back in grade school or the like, you learned to count and add and subtract numbers by way of columns.

但是，在座的每一位可能都记得,这在小学的时候学的,以10为进制的系统或者十进制系统,通过数列方式学习数数和加减法。

哈佛公开课 - 计算机科学课程节选

And since we don't have to charge compensate, we can add or subtract neutrons at liberty.

因为我们没有电荷补偿，我们就可以随意地加上火减少中子。

麻省理工公开课 - 固态化学导论课程节选

Not only could they add and subtract up to 20, but many could recite Tang and Song dynasty poetry.

CNN: LITTLE EMPERORS

He could add and subtract using his fingers, but he could not tell the time, he did not know the seasons and he could not understand directions.

ECONOMIST: Capital punishment in America: Justice, delayed and denied | The

If boys and girls in Africa and other developing nations don't learn how to read, write, and add and subtract, this world is just going to move on without them.

NPR: President Bush's Remarks on the World Agenda