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# Arithmetic : Fractions

 Preparation Just what you need to know !

Numerator and Denominator

A fraction is a number that represents a ratio or division of two numbers n and m with m ≠ 0.

 It is typically written in the form n m or n/m.

The number n at the top is called the numerator.
The number m at the bottom is called the denominator.

For example, ¾ is a fraction whose numerator is 3 and denominator is 4.

The denominator indicates the total number of equal parts that something is divided into, whereas the numerator indicates the number of these parts that are taken.
For example, ¾ indicates taking 3 out of a total of 4 equal parts.

If the numerator and denominator of a fraction are the same number, the fraction equals one.
For example, 4/4 = 7/7 = 1.

MUST-KNOW : No fraction can have zero as its denominator because division by 0 is not defined.

A fraction with zero as its numerator is equal to 0.

A fraction with one as its denominator is equal to the whole number that is its numerator.
For example, 5/1 is 5 and 0/1 is 0.

GMAT Math Review - Arithmetic : Index for Fractions

10 more pages in GMAT Math Review