He is skillful at playing the piano.

He is good at playing the piano.

He says that what you like to do, you do well, so he practices drawing every day.

He solved a large number of problems.

I can't solve this problem because there are too many numbers.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

Please clean up your room right now.

Discrete mathematics is an important field that forms the basis of computer science.

He is majoring in applied mathematics at university.