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.

In this chemical reaction, a specific isotope is produced.

There are many people who think the same as his opinion.

Could you tell me your country code?

What is my telephone number?

Could you tell me your individual number?

I got her mobile number.