# Arithmetic Course/Number Operation/Multiplication

## Multiplication[edit]

Addition is the operation of adding (combining) two quantities which can be represented by

- A x B

## Operation[edit]

- a x b = b x a
- a x b x c = a x (b x c) = (a x b) x c

## Rules[edit]

Any number multiply by zero is equal to zero

- a + 0 = a

Any number multiply to itself is

- a x a = a
^{2}

Any negative number multiply by itself is

- (-a) x (-a) = a
^{2}

Any number multiply to its negative is

- a x (-a) = -a
^{2}