Answer
$-840$
Work Step by Step
$|-640|=640, |-200|=200$, and $640+200=840$.
Their common sign is negative, so the sum is negative:
$-640+(-200)=-840$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 2 - Section 2.2 - Adding Integers - Exercise Set - Page 112: 23
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