The set of all real numbers can be graphically represented by the real number line, that is, a straight line, on which the origin and a scale are chosen.
All positive numbers correspond to points lying to the right of zero. They are ordered, in ascending order from left to right.
All negative numbers are represented by points to the left of zero. They are ordered, in descending order from right to left.
The number zero is neither positive nor negative. It is represented by the intermediate point between positive and negative numbers:

There is one-to-one correspondence between the set of real numbers and points on the number line, that is, every real number corresponds to a unique point on the number line, and vice versa.

Index Real Numbers Complex Numbers Exponentiation Algebraic Transformations Algebraic Equations and Ineualities Functions Discrete Algebra Basic Formulas Graphics of Basic Functions