Integers & Absolute Value

Chapter 1-4Prentice Hall Pre-Algebra

Check Skills You’ll NeedWrite an integer for each situation.

Loose $7◦ -7

Find $9◦ +9

8 steps forward◦ +8

3 yards gained◦ +3

5 floors down◦ -5

DefinitionsIntegers

◦Whole numbers and their oppositesAbsolute Value

◦The distance from zero to a number on the number line.

Opposite Numbers◦Numbers that are the same distance

from zero on the number line.

Graphing on a Number LineGraph -1, 4, and -5 on a number line. Compare the numbers and order them from least to greatest.

From least to greatest, the numbers are -5, -1, 4

Finding Absolute Value

Use the number line to find |−3| and |3|

Quick Check1. Write |−10| in words. Then find |−10|

◦ Absolute value of negative 10; 10

2. What is the absolute value of negative 3?◦ 3

3. What is the absolute value of 3?◦ 3

4. What is the absolute value of −9 ?◦ 9

5. Simplify |−7|◦7

More Exercises Page 20

1. A profit of $250◦ 250

2. 18 degrees below zero◦ −18

3. 45 seconds before launch◦ −45

4. An elevation of 3,400 ft.◦ 3400

5. A debt of $50◦ −50

6. 300 ft below sea◦ − 300

Write an integer to represent the quantity:

Write an expression

1. A loss of 1/3 of an investment of d dollars

◦ −1/3 d

2. n degrees Fahrenheit above r degrees Fahrenheit.

◦ r + n

3. What expression would you use to represent 10 times your height h in inches?

◦ 10h

Compare using >, <, or =

1. −8 ? 0◦ <

2. 4 ? −25◦ >

3. |−6| ? |−12|◦ <

4. |10| ? |−10|◦ =