Question

Additive inverse of $-51$ is

Answer 1

The additive inverse of a number is that number on adding it to the original number the result should be zero

e.g $a+(-a)=0$ here $a$ is the number while $-a$is the additive inverse of $a$ because on adding it with the number we get zero.

Hence the additive inverse of $-51$ is $51$.