Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Representation and Calculation - Chapter Summary, Review, and Test - Review Exercises - Page 244: 16


The answer is -3.

Work Step by Step

8 + (-11) = -3. To arrive at this answer, we look at the signs on the numbers. One is negative and one is positive. When the signs are different, we first consider the absolute values of each number (8 and 11). Then we take the difference of those absolute values. 11 - 8 = 3. Now, look at the original numbers. Which one is farthest from zero on a number line? In this case, it is -11. The number is negative in the problem, so our answer is also negative. So, 8 + (-11) = -3.
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