Answer
$0$
Work Step by Step
Adding Two Numbers with Different Signs:
Step 1: Find the larger absolute value minus the smaller absolute value
Step 2: Use the sign of the number with the larger absolute value as the sign of the sum
$|18|=18, |-18|=18, 18=18$
$18-18=0$
Both 18 and -18 have the same absolute value, so either way (choosing -18 or 18 as the larger number) will result in the answer equaling $0$.
