A number line is a line divided into equal parts on which numbers are ordered.
On a line, the numbers are placed in ascending order. The first number on the left is the smallest and the last number on the right is the largest.

A number line is separated into equal parts. These parts are called intervals that represent equal jumps.
Example:
The graduation interval of this number line is + 2.

A number line is a line divided into equal parts on which whole positive and negative numbers (integers) or decimals are ordered.
A number line is separated into equal parts. These parts are called intervals that represent equal jumps.
Examples:
The graduation interval of this number line is + 2.

The graduation interval for this number line is + 1.

The graduation mark for this number line is + 0.1.

A number line is separated into equal parts. These parts are called intervals that represent equal jumps.
Examples:
The graduation interval of this number line is |+\,2.|

The graduation interval of this number line is |+\,1.|

The graduation interval of this number line is |+\,0.1.|

The graduation interval of this number line is |+\ \dfrac{1}{4}.|
