**Vulgar Fraction**: The fractions such us 3/11, 5/14, 2/10, 67/100 are called common or vulgar fractions.

**Imaginary Number**: Any number which is of the form ? -1´a is an imaginary number

**Real Number**: Any number which is not an imaginary number is a real Real Number. Real Numbers may be divided into two category:

**Rational Number:** A number which can be represented in the form of p/q where p and q are integers and q is not equal to 0.

**Irrational Number:** A number which cannot be expressed in the form of p/q is called an irrational number.

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