Download Do Now 6/1/06

Do Now 9/16/09
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Take out your HW from last night.
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Copy HW in your planner.
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“One Left Out” worksheet
Textbook page 32, #14-40 even, #48-58 even
Quiz on adding and subtracting integers Monday.
In your journal, answer the following question.
What is the sum of two opposite numbers? Give
three examples.
Homework
“One Left Out”
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1) 3 + 5 x 9
2) 25 – 65 / 5
3) 24 / 6 x 4
4) 16 – 8 + 9
5) 45 – 4 x 5
6) 9 + 6 / 3
7) 9 – (8 – 7)
8) 32 / (8 / 4)
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9) 50 – (20 +30)
10) 48 / (4 + 12)
11) 12 x (36 / 9)
12) 17 + (7 – 6)
13) (10 – 6) + (12 + 9)
14) (1 +4 ) x (2 +3)
15) [15 – (4+1)]²
The keys of a piano.
Objective
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SWBAT use a number line to perform
integer addition
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SWBAT use absolute values to perform
integer addition
Please take out your number lines
Using Counters
negative
positive
-6 + 2 = -4
-6
+2
Zero Pair
-1 + 1 = 0
Using Counters
negative
positive
5 + (-3) = 2
5
-3
Zero Pair
-1 + 1 = 0
Section 1.5 “Adding Integers”
-5 -4 -3 -2 -1 0 1 2 3 4 5
+5
-1 + 5 =
When you ADD a
POSITIVE NUMBER
-1 + 5 = 4
Addition
Using a Number Line
-5 -4 -3 -2 -1 0 1 2 3 4 5
-7
3 + (-7) =
When you ADD a
NEGATIVE NUMBER
3 + (-7) = -4
Try It Out
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1). 7 + (-5) = 2
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2). -13 + 8
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3). (-7) + (-4) = -11
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4). 15 + (-17) = -2
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5). |-10| + (-7) = 3
= -5
Addition
Using a Number Line
-1 + 5 + (-7)
-5 -4 -3 -2 -1 0 1 2 3 4 5
-7
+5
-1 + 5 =
4 + (-7) =
When you ADD a
POSITIVE NUMBER
When you ADD a
NEGATIVE NUMBER
-1 + 5 + (-7) = -3
Addition
Using a Number Line
-1 + (-4) + 9
-5 -4 -3 -2 -1 0 1 2 3 4 5
-4
-1 + (-4) =
-5 + 9 =
+9
When you ADD a
NEGATIVE NUMBER
When you ADD a
POSITIVE NUMBER
-1 + (-4) + 9 = 4
Try It Out
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1). -3+ 10 + (-5)
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2). -13 + 8 + (-6) = -11
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3). (-7) + (-4) + 4 = -7
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4). 15 + (-17) + 9 = 7
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5). -8 + |-10| + (-7) = -5
=2
ABSOLUTE VALUE
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-5
The distance a number is away from ZERO. Distance is
always positive.
-4
-3
-2
negative
-1
0
1
2
zero
3
4
positive
What is the absolute value of -4? or |-4|
|-4| = 4
What is the absolute value of 4? or |4|?
|4| = 4
5
Adding Two Integers with DIFFERENT signs
To add two integers with DIFFERENT
signs, subtract the smaller absolute value from
the greater absolute value and write the sign of
the integer with the greater absolute value.
-35 + 18
|-35| = 35
|18| = 18
Because 35 has a greater 35 – 18 = - 17
absolute value than 18 the
answer is “negative”.
-43 + 35
|-43| = 43
|35| = 35
Because 43 has a greater
43
–
35
=
8
absolute value than 35 the
answer is “negative”.
-53 + 85
|-53| = 53
|85| = 85
85 – 53 = 32
Because 85 has a greater
absolute value than 53 the
answer is “positive”.
Negative or Positive?
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Without solving the problem, decide
whether the sum will be positive, negative,
or zero.
7 + (-4)
-13 + 11
positive
-3 + 3
zero
negative
73 + (-67)
positive
Try It Out…
-43 + 95 = 52
-43 + (-15)= -58
37 + (-46) = -9 -123 + 162 = 39
-13 + 13 = 0
-83 + 57 = -26
“Integer” Cards
 Red
cards = Negative
 Black cards = Positive
 Jack = 11, Queen = 12, King =13
 Dealer deals each player 2 cards.
 The player with the highest sum,
gets all the cards from that round.
 The player with the most cards at
the end of the deck wins!
Homework
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Textbook page 32 #14-40 even, #48-58
even