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

youdao

We add up the goods, subtract the bads-- whatever our favorite list is-- and we come to our best educated guess about the rival evaluations of not just lives as a whole, but chunks of lives.

我们把好事加起来减去坏事-,不管我们最喜欢哪些事-,我们不但可以据理推测,一生期间其他生活的价值，还能推测某段时间其他生活的价值。

耶鲁公开课 - 死亡课程节选

Most states base their income tax laws on federal law and most have their own versions of add-back and subtract modification to adjusted gross income.

FORBES: Congress Would Say 'Nein, Nein, Nein' To Cain's 9-9-9 Tax Plan

But he said transcranial random noise stimulation could help more people because it had the potential to improve the ability to add, subtract or multiply a string of numbers in your head - not just new number learning.

BBC: Brain stimulation promises 'long-lasting' maths boost