Answer
$-656$
Work Step by Step
$|-400|=400, |-256|=256$, and $400+256=656$.
Their common sign is negative, so the sum is negative:
$-400+(-256)=-656$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.