Anumber that when added to another number equals zero

-2+2=0 because on the number line -2 is two spots from 0 then when u add a positive 2 it equals 0.

If you mean "A number that when added to the original number equals zero", then the answer would be an additive inverse.

I hope this helps, and have a good night! :D

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.