I am good at calculations.

How accurate is this thermometer?

You need to use your head to solve this problem.

He is using that coat from winter to spring.

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.

I made an off-air recording of last night's radio program.

He likes to record radio programs off-air.