# How do you find the additive and multiplicative inverse of 1.25?

Aug 5, 2017

The additive inverse of $1.25$ is $- 1.25$

The multiplicative inverse of $\frac{5}{4}$ is $\frac{4}{5}$

#### Explanation:

Additive inverses have the same number, but opposite signs.
Their sum is $0$

The additive inverse of $1.25$ is $- 1.25$

Multiplicative inverses are also called reciprocals.
One is the upside-down fraction of the other,
Their product is $1$.
$1.25 = 1 \frac{1}{4} = \frac{5}{4}$

The multiplicative inverse of $\frac{5}{4}$ is $\frac{4}{5}$