He is learning to add and subtract.

他正在学习加减法。

youdao

Learning to add, pride to reduce, opportunity to multiply, lazy to delete.

学习要加，骄傲要减，机会要乘，懒惰要除。

youdao

Now, Yasuda says, companies are learning to evaluate all their functions and operations based on how they add to shareholder value.

CNN: THE NEW JAPAN INC.

If an hour later we have more spam, we can add to the collection so we keep on learning more and more.

BBC: NEWS | Technology | 'DNA analysis' spots e-mail spam

Learning a lesson from its experience in Mexico, where it had to add to its Cifra stake by buying shares at ever-higher prices on the open market, Wal-Mart purchased warrants to potentially raise its Seiyu position to 67%.

FORBES: Magazine Article