Transcript Do Now 10/21/07 - Howell Township Public Schools

Do Now 10/4/11
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Take out HW from last night.
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Copy HW in your planner.
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Text p. 54, #21-38 all, 40-44 evens, 45, & 57
Text p. 62, #1-8 all, 13-20 all, 36-41 all, 56
Quiz on integer addition and subtraction Friday.
In your journal, define the word SUBTRACT.
Explain how you subtract two numbers.
Homework
Text p. 54, #21-38 all, 40-44 evens, 45, & 57
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21) -19
22) 39
23) -16
24) -15
25) -88
26) 25
27) -55
28) -80
29) -14
30) -29
31) -13
32) 14° F
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33) -13
34) 7
35) -26
36) -18
37) 14
38) -29
40) =
42) <
44) =
45) Cody’s account is reduced by $24
57) F
Objective
 SWBAT
subtract integers
Section 2.3
“Subtracting Integers”
subtracting two integers, ADD
the OPPOSITE of the second
number to the first.
 When
8–5=
Do the “OPP-OPP”
8“Opposite-Opposite”
+ (-5) = 3
ADD the OPPOSITE
Don’t Subtract…
ADD the OPPOSITE!!!
-8 – 6
Instead of subtracting ADD
the OPPOSITE!!
What is the opposite of 6?
ADD the OPPOSITE “OPP-OPP”
-8 + (-6) = -14
-6
Subtraction
Using a Number Line
-5 -4 -3 -2 -1 0 1 2 3 4 5
-1 – (-5) =
“OPP-OPP”
-1 + (+5) =
+5
When you ADD a
POSITIVE NUMBER
-1 + 5 = 4
Subtraction
Using a Number Line
-5 -4 -3 -2 -1 0 1 2 3 4 5
-7
2–7=
“OPP-OPP”
2 + (-7) =
When you ADD a
NEGATIVE NUMBER
2 + (-7) = -5
Try It Out!!
 1).
-8 – 2
-8 + (-2) = -10
 2).
-2 – 5
-2 + (-5) = -7
 3).
6 – (-5) 6 + (+5) = 11
 4).
|-4| – (-8) 4 + (+8) = 12
Clock Partners
With your 6:00
partner, complete
Activity 10.
Homework
 Text
p. 62, #1-8 all, 13-20 all, 36-41 all, 56
Negative or Positive?
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Without solving the problem, decide whether the
sum will be positive, negative, or zero. (HINT:
write the problem as a sum).
Add the Opposite !!!
17 – (-2)
-14 – (-14)
17 + (+2)
-14 + (+14)
zero
positive
-13 – 11
-13 + (-11)
negative
73 – 84
73 + (-84)
negative