Question

what property is this?
multiplicative inverse
commutative
multiplicative identity
associative

Explanation:

The multiplicative inverse of a non - zero number $a$ is $\frac{1}{a}$, and when a number is multiplied by its multiplicative inverse, the result is 1. Here, $\frac{4}{5}$ and $\frac{5}{4}$ are multiplicative inverses of each other. The commutative property is about changing the order of operands in an operation ($a\times b = b\times a$), the multiplicative identity is 1 such that $a\times1=a$, and the associative property is about grouping in an operation ($(a\times b)\times c=a\times(b\times c)$).

Answer:

Multiplicative Inverse