Binary values and number systems

Question 1

What is a number?

Answer 1

a unit of an abstract mathematical system subject to the zeroth law of arithmetic.

Question 2

what is the difference between a natural number and a negative number?

Answer 2

A natural number is 0 and any number that can be obtained by repeatedly adding 1 to it. A
negative number is less than 0, and opposite in sign to a natural number. Although we usually do
not consider negative 0.