Transcript Integers and Absolute Value

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Objective
Read and write integers and find the
absolute value of an integer
Vocabulary
Integer
Whole numbers that are positive, negative and
zero
{ . . . -4, -3, -2, -1, 0, 1, 2, 3, 4, . . . }
Vocabulary
Graph
A point on a number line
Vocabulary
Positive Integer
Whole numbers that are greater than zero
{ 1, 2, 3, 4, . . . }
Vocabulary
Negative Integer
Whole numbers that are less than zero
{ . . . -4, -3, -2, -1 }
Vocabulary
Absolute Value
The distance the number is from zero on a number
line
| -5 | = 5
Math Symbols
+3
positive 3
-3
negative 3
|3|
absolute value of 3
Example 1 Write Integers for Real-Life Situations
Example 2 Write Integers for Real-Life Situations
Example 3 Evaluate Expressions
Example 4 Evaluate Expressions
Write an integer for the following situation.
The seasonal snowfall for Barrow, Alaska was 3 inches
above normal.
+3
Write the number
Determine the sign by looking
for a direction word
Above refers to positive
Answer: + 3
1/4
Write an integer for the following situation.
The average monthly temperature in Cleveland, Ohio for
the month of January was 4 degrees below normal.
Answer: –4
1/4
Write an integer for the following situation.
The total rainfall this month is 2 inches below normal.
-2
Write the number
Determine the sign by looking
for a direction word
Below refers to negative
Answer: - 2
2/4
Write an integer for the following situation.
The total snowfall this month was 5 inches above normal.
Answer: + 5
2/4
Evaluate the expression
Write the expression
Absolute value means how far the
number is from zero on the number line
-5 is 5 units from zero
Answer:
5
3/4
Evaluate the expression
Answer: 9
3/4
Evaluate the expression
Write the expression
| -4 | - | -3 |
4- 3
1
Follow order of operations
P
E
MD AS
Absolute value symbols are
enclosures
Find  -4 
Bring down -
Answer: 1
Find  -3 
Subtract
4/4
*
Evaluate the expression
Answer: 3
4/4
Assignment
Lesson 3:1 Integers and Absolute Value
11 - 28 All