Chapter Study Guide and Review
118 IntegersAdd and Subtract Integers
Add Integers (Lesson 2B)
Add.
- 6 + 8 25. - 4 + (-9)
- 7 + (-12) 27. - 18 + 18
- 2 + 9 29. - 10 + (-5)
- 6 + (-9) 31. 17 + - 17
- HIKING Alicia hiked 75 feet up a
mountain. She then hiked 22 feet higher.
Then, she descended 8 feet, and finally
climbed up another 34 feet. What is the
final change in Alicia’s elevation? - HIBERNATION A black bear can weigh as
much as 900 pounds when it starts
hibernating. It loses 350 pounds during
hibernation and gains 50 pounds two
months after hibernation ends. What is
the bear’s final weight?
EXAMPLE 5 Find - 4 + 3.- 3 - 2 - 10 1
- 4
+ 3- 5 - 4
So, - 4 + 3 = -1.
EXAMPLE 6 The population of Ankeny
grew by 2,394. Then it decreased 1,459.
Then it decreased 3,490 more. What is the
net change in population?
The changes in population can be
represented by the addition sentence
2,394 + (-1,459) + (-3,490).
2,394 + (-1,459) + (-3,490) = -2,555
So, the net change in population is -2,555.Subtract Integers (Lesson 2D)
Subtract.
- 5 - 8 35. 3 - 6
- 5 - (-2) 37. - 4 - (-8)
- 3 - 7 39. 12 - 17
- 4 - (-7) 41. - 10 - (-9)
- GOLF Owen shot 2 under par while his
friend Nathan shot 3 over par. By how
many shots was Owen’s score better
than Nathan’s? - VOLCANOES The summit of an oceanic
volcano once had an elevation of- 3,780 feet. The summit now has an
elevation of -800 feet. What was the
change in elevation?
- 3,780 feet. The summit now has an
EXAMPLE 7 Find - 3 - 9.- 3 - 9 = - 3 + (-9) To subtract 9, add -9.
= - 12 Simplify.
EXAMPLE 8 On Wednesday, a company’s
stock closed at $13.54. On Thursday, it
closed at $12.28. What was the change
in the closing price?
To find the change in closing price, subtract
$13.54 from $12.28.
$12.28 - $13.54 = -$1.26
The change in closing price is -$1.26.Lesson 2116_120_SGR_895130.indd 118 12/29/09 12:49 PM