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Remark: The number 0 is neither a positive nor a negative rational number.

 Rational numbers on a number line:
Representation of whole numbers, natural numbers and integers on a number line is done as follows.

Rational Numbers can also be represented on a number line like integers

i.e. positive rational numbers are on the right to 0 and negative rational numbers are on the left of 0.
Representation of rational numbers can be done on a number line as follows

 Rational Numbers in Standard Form
A rational number is in the standard form if its denominator is a positive integer and there is no common
factor between the numerator and denominator other than 1.

If any given rational number is not in the standard form then we can reduce it to its standard form or the

lowest form by dividing its numerator and denominator by their HCF ignoring its negative sign.

Example:

12
Find the standard form of .
18
Solution:
12 6 2
÷ = [6 is the HCF of Numerator 12 and denominator 18]
18 6 3
2 12
Therefore is the standard form or simplest form of
3 18