Number Lines

In Math, number line is a line of any length which is used to place the real numbers in order. Real numbers include the positive numbers, negative numbers, zero, decimal numbers and even fractions.

What is a number line? As the name suggests, a number line is a line with numbers, numbers here mean, real numbers which consist of positive, negative, decimals, fractions including zero. Zero is called the origin. The line can be of any length according to the numbers we need to place on it.
There are many points on the number line, each of the point relates to a real number and again each number has a unique point that corresponds to it.
For example, 2.5 (2 ½) corresponds to a point on a number line that is halfway between 2 and 3.

Rules to remember:
On the number line,
1. the point zero is the origin
2. all the points to the right of the origin are positive numbers and
3. all the points to the left of the origin are negative numbers
4. The number is smaller if it is left of another
5. The number is greater if it is right of another
6. The distance between two numbers is the difference between the greater and the smaller number.
A number line is used for learning as to how to compare the negative and positive numbers
As we start moving from left to right on a number line, the number gets bigger and as we move from right to left, the number gets smaller

Number line template:

Integer Number line: On the number line, the point zero is the origin, all the points right to the origin are positive integers and all the points left to the origin are negative integers.

Decimal number line: 
We can place decimals on a number line. For which, each segment of the number line is divided into ten equal parts.

Let us place the point 3.5 on the number line.

  For a better understanding, let us place the following points on a number line,
A=1.8, B=2.6, C=4.2, D= -1.4