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|◦ =