He got some really good arithmetic skill, but he doesn't understand the problem.

他得到了一些很好的算术技能，但他不明白的问题。

youdao

Typing, though, with all of its significant inefficiencies, is rapidly becoming a skill as basic as reading and arithmetic.

ENGADGET: Switched On: Time to write off pen computing

Failure to apply simple arithmetic probably causes more personal economic damage or missed career opportunities than any other lack of skill.

FORBES: Magazine Article