Question

What is the sum of predecessor and successor of $-1$?

Answer 1

Find the sum of predecessor and successor of $-1$:

The predecessor of a number is a number that's one lesser than the given number and the successor of a number is a number that's one greater than the given number.

The predecessor of $-1$ $=-1-1$

$=-2$

The successor of $-1$ $=-1+1$

$=0$

The sum of $-2$ and $0$ $=-2+0$

$=-2$

Hence, the sum of predecessor and successor of $-1$ is $-2$.