Download Integer

Do Now 9/21/10
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Take out HW from last night.
 Text p. 24-25, #1-11 all, #18-41 all
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Copy HW in your planner.
 Text p. 25, #42-50 all, #54-64 all, but not 60
 Quiz Sections 1.3-1.4 Wednesday
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In your journal, explain why the absolute value of a
number is always positive. Can you create a problem
that contains an absolute value symbol where the
answer would be negative?
Homework
Text p. 24-25, #1-11 all, #18-41 all
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1) 22.5
2) distance is
always positive
3) -9, -5, -3, 0,
6, 12
4) 1
5) 9
6) 15
7) 12
8) -14
9) 33
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10) 24
11) -81
22) -12, -6, -1, 0, 4
23) -8, -5, -4, 7, 15
24) -10, -5, 35, 40, 60
25) -30, -25, -22, -16
26) 22
27) 7
28) 21
29) 40
30) 38
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31) 42
32) 73
33) 105
34) -6
35) -9
36) 2
37) 11
38) 31
39) 67
40) -81
41) -100
Objective
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SWBAT evaluate expressions involving
absolute value brackets and negatives.
Section 1.4, “Compare and Order
Integers”
Integer- the set of whole numbers
and their opposites
Integers
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Integers are divided into three
categories:
 Positive
numbers
 Negative numbers
 Zero
-5 -4 -3 -2 -1 0 1 2 3 4 5
negative
zero
positive
ABSOLUTE VALUE
The
distance a number is away from
ZERO. Distance is always “positive.”
-5
-4
-3
-2
negative
-1
0
1
2
zero
What is the absolute value of -4? or |-4|
What is |4| ?
3
4
5
positive
|-4| = 4
|4| = 4
Evaluate the Expressions
when x = -5
-x
Substitute
-(-5)
The
opposite
of -5 is 5.
5
17– |x|
17 – |-5|
17 – 5
12
Substitute
The
absolute
value of
-5 is 5.
Evaluate the Expressions
when x = -4 and y = -7
(-x) + (-y)
-(-4) + -(-7)
4+7
11
|y| – |-x|
|-7| – |-(-4)|
7–4
3
Evaluate the Expressions
when x = -4 and y = -7
-|x|
-|-y|
-|-4|
-4
-|-(-7)|
-7
The absolute value of -4 is 4.
The opposite of 4 is -4.
The absolute value of -(-7) is 7.
The opposite of 7 is -7.
Review Sections 1.3 & 1.4
Section 1.3, Order of Operations
Order of Operations –
the rules established to evaluate an
expression involving more than one
operation
Order of Operations
PEMDAS
1
2
3
4
Evaluate expressions within grouping signs.
( ) parentheses, [ ] brackets, fraction bars
Evaluate powers.
Multiply and divide from left to right.
Add and subtract from left to right.
Section 1.4, “Compare and Order
Integers”
Integer- the set of whole numbers
and their opposites
Integers

Integers are divided into three
categories:
 Positive
numbers
 Negative numbers
 Zero
-5 -4 -3 -2 -1 0 1 2 3 4 5
negative
zero
positive
ABSOLUTE VALUE
The
distance a number is away from
ZERO. Distance is always “positive.”
-5
-4
-3
-2
negative
-1
0
zero
1
2
3
4
positive
5
BLUFF!
Homework
 Text
p. 25, #42-50 all, #54-64 all, but not 60
 Quiz Sections 1.3-1.4 Wednesday