# Arithmetic/Types of Numbers/Fraction

## Fraction

Fraction is a ratio of two integer numbers. Fraction can be expressed mathematically

$\frac{A}{B}$, where B is not zero.

Where

A is called Numerator
B is called Denominator

## Equal Fractions

$\frac{A}{B} = \frac{C}{D}$ when A = C , B = D
$\frac{A}{B} \frac{D}{D} = \frac{C}{D} \frac{B}{B}$ when AD = BC

## Rules

1. $\frac{A}{B}$ + $\frac{C}{D}$ = $\frac{AD + BC}{BD}$
2. $\frac{A}{B}$ - $\frac{C}{D}$ = $\frac{AD - BC}{BD}$
3. $\frac{A}{B}$ x $\frac{C}{D}$ = $\frac{AC}{BD}$
4. $\frac{A}{B}$ / $\frac{C}{D}$ = $\frac{AD}{BC}$, if C not zero.