A negative number refers to a number less than zero.

He solved a large number of problems.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

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

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

The Reynolds number is an important concept in fluid dynamics.

The dual number does not exist in English grammar.

What should I do to find the root number of this equation?

His birthday will come in a few days.