Multiplication of Numbers Distributes over Addition

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On all the number systems:

natural numbers $\N$
integers $\Z$
rational numbers $\Q$
real numbers $\R$
complex numbers $\C$

the operation of multiplication is distributive over addition:

$m \left({n + p}\right) = m n + m p$
$\left({m + n}\right) p = m p + n p$


This is demonstrated in these pages:


Also known as

This result is known as the Distributive Property.

As such, it typically refers to the various results contributing towards this.

At elementary-school level, this law is often referred to as (the principle of) multiplying out brackets.

Also see